The Greatest TTR 125 Mods That Are ACTUALLY Value Your Cash

In search of the most effective TTR 125 mods however undecided the place to begin? Whether or not you need the most effective efficiency components to go sooner otherwise you’re simply making an attempt to make it safer and extra comfy, you’re in the precise place!

On this article, I’ll present you the most effective efficiency mods & upgrades you are able to do to your TTR125/TTR125LE, why every mod could or will not be best for you, after which find out how to mix the most effective upgrades to get essentially the most efficiency improve based mostly in your particular wants and finances!

TTR 125 Suspension improve

Getting the forks and shocks to work correctly is extraordinarily vital to get a cushty and compliant experience in case you’re an grownup driving a TTR125. The suspension elements on these bikes had been made with simplicity and price in thoughts = low efficiency and gentle.

The forks are low-performance with the intention to make the bike cheaper to purchase, however there are a number of reasonably priced methods to make your TTR 125 forks work so significantly better!

Yamaha TTR125s The Best TTR 125 Mods That Are ACTUALLY Worth Your Money

Entrance fork upgrades

The inventory fork setup is sort of a pogo stick in case you’re doing greater than driving on flat floor in first gear. The springs are gentle and the valving is gentle and one-dimensional.

In different phrases, there’s no development of stiffness because it compresses by the stroke. When you hit a log or rock at too excessive of a pace, it’s going to simply blow by the stroke if it’s too gentle to your weight.

There are just a few various things you are able to do. They vary from just below 100 bucks to shut to 1,000, relying on how you place it collectively, however let’s begin with the cheaper choices.

Springs and Oil Change

The inventory fork springs are nice…. in case you weigh 80 lbs. Stiffer springs (Amazon) are a pleasant and pretty low-cost mod to stiffen it up for a greater experience.

A fork rebuild isn’t too tough in case you have an OEM handbook, correct instruments, and a few mechanical motivation. Under is a video on find out how to rebuild your TTR125 forks.

A pair of heavier-duty fork springs are a simple technique to improve spring fee and stiffen up your suspension, but it surely’s not at all times the easiest way to go to your TTR125. A pair of stiffer springs may very well be an excessive amount of, inflicting a harsh experience in case you weigh underneath 160lbs and don’t do jumps with this bike.

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As an alternative, to get a stiffer, but extra plush fork motion to assist eliminate that pogo-stick experience, you should use one stiffer fork spring and heavier-weight fork oil (Amazon). That’s proper, one stiffer spring and one inventory spring will nonetheless improve the spring fee over inventory, and the heavier fork oil will assist with the damping.

Low cost/Free Re-Valve?!

A heavier oil will gradual the damping/compression of the fork down as you go over objects. It’s sort of just like the poor man’s re-valve.

You can too tune the oil degree (air hole within the forks) to assist with bottoming resistance. Simply keep in mind to remain throughout the really helpful manufacturing unit tolerances or else you threat doing injury or blowing seals with too little or an excessive amount of oil within the fork.

To save lots of much more cash, artificial motor oil can be utilized as a fork oil substitute. I’ve personally used it in a few of my forks as per the advice of Bruce Triplett, the old-school suspension guru.

Using a pair of modified TTR125’s

Rear shock upgrades

Very similar to the inventory fork, a stiffer spring can be utilized to accommodate a heavier or extra aggressive rider. New shock springs (Amazon) are across the similar value as fork springs.

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The subsequent costly mod can be to swap the inventory shock with one from a TTR125LE mannequin in case you have a typical or 125L mannequin. The 125LE shock has a distant reservoir and is adjustable. You possibly can rebuild it or ship it to knowledgeable to get it re-valved to your weight and driving type.

The final choice that’s straightforward to do (there are different shock swaps however they contain body modifications) is to only purchase an aftermarket shock to your TTR125. They carry out significantly better than inventory however are much more costly.

TTR 125 Suspension conversion equipment

Possibly you’ve seen folks with a TTR 125 that has entrance forks and a rear shock from a special bike, such because the YZ85 motocross bike. Sadly, there’s no aftermarket suspension conversion equipment which you can truly purchase.

It’s important to purchase the forks and do the mods your self. This entails becoming the entire entrance finish after which probably performing some slight mods to make it match correctly after which getting the entrance and rear suspension balanced in order that it handles effectively.

Don’t Snap Your Body In Half

A body cradle is an additional help to the body of your TTR125. If you’re a heavier rider that surpasses the OEM weight capability, you threat bending or cracking your body. That is very true in case you experience aggressively.

A damaged body whereas driving couldn’t solely end in pricey repairs however there’s a major threat of harm if the injury is extreme sufficient to trigger you to wreck.

I’ve a BBR body cradle (Amazon) on each of my TTR125’s. It’s simply low-cost insurance coverage in case you’re going to experience them onerous.

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Everybody is aware of you want tires in the end, however it is a extra vital mod or improve than you may assume. Having recent rubber (Amazon) will make an enormous distinction in dealing with in case your tires are worn or over a 12 months previous!

Gentle rubber offers you extra traction, particularly when the terrain is difficult or slippery. Tire rubber will get more durable because it ages, and the lack of traction not solely makes driving harder but additionally extra harmful.

TTR125 L with some mods

A rear tire will gradual you down from a scarcity of traction, however a bald or onerous entrance tire can simply lose traction and trigger the entrance finish to scrub out. These are the sort of accidents that have you ever in your face so quick that you simply’ll be questioning what on the earth occurred! Sure, talking from expertise right here…


Earlier than doing any mods to make your TTR extra highly effective, that you must study find out how to correctly tune a carburetor. Jetting a carb could sound intimidating to you in case you haven’t achieved it earlier than, but it surely’s not as sophisticated as you may assume.
You will get began in only a few minutes to make your bike simpler to begin and have extra energy.

TTR125 Mikuni VM24 Carb Swap Best Bang For Your Buck 1 The Best TTR 125 Mods That Are ACTUALLY Worth Your Money
Inventory TTR125 Carb

The TTR125 is often fairly lean from the manufacturing unit, so any consumption or exhaust mods you do will in all probability make that lean situation worse. Lean jetting will make the bike more durable to begin, not run as easily, and infrequently pop/backfire on deceleration.

A TTR125 often runs lean from the manufacturing unit. If it’s onerous to begin, pops or crackles on deceleration, or takes a very long time to heat up, that is in all probability as a result of that you must go bigger on the pilot jet.

Free Air Field Mod

When you’ve discovered find out how to re-jet your TTR125, now you can begin making modifications that may truly make a distinction in energy and throttle response, as a result of that’s what we’re going after, proper?

The primary and best mod you are able to do is take away the air field lid. This may be seen on prime of the air field while you take away the seat. The airbox retains grime out of and getting sucked into your engine by the carb, but when there’s not sufficient space for air to get in, you’re lacking out on doable energy positive aspects.

The larger and extra highly effective an engine, the extra air it must suck in. Eradicating the air field lid tremendously will increase the realm in that air can get pulled in.

Extra Air + Extra Gas = Extra Energy

In order for you much more air you possibly can drill or minimize 1″ diameter holes in your air field and canopy the within of them with foam to assist maintain grime out. Simply do not forget that the extra holes/space you will have open in your air field, the extra grime and mud can enter in.

Because of this it’s vital to have an excellent, clear air filter that may maintain extra grime out of your engine whereas permitting extra air in. Or there’s at all times upgrading to a carb that may mechanically offer you extra air and energy when correctly jetted…

Simple Carb Swap Higher In Each Approach??

The inventory TTR125 carb is missing, to place it evenly. The choke knob may be good to have on the handlebars, but it surely’s not dependable long-term. The inventory carb will get soiled internally and the passages gum up simply as a result of they’re so small.

A unclean carb additionally makes it very tough to begin the engine, whether or not it’s kick-start or electrical begin. The inventory carb can also be very lackluster in throttle response and energy.

TTR125 Mikuni VM24 Carb Swap Best Bang For Your Buck 2 The Best TTR 125 Mods That Are ACTUALLY Worth Your Money
VM24 Carb

Upgrading to a Mikunki VM24 carb (pre-jetted on Amazon) is a reasonably easy conversion in case you like DIY initiatives. The VM24 carb, when correctly jetted, will make your TTR125 begin simpler, have a greater throttle response, and supply extra energy, particularly with supporting exhaust and engine mods.

To view the entire written and video information on find out how to swap the inventory carb for a Mikuni VM24 and the place to seek out one click on right here.

Exhaust improve: professionals & cons

Changing your inventory exhaust system or muffler with an aftermarket unit is without doubt one of the commonest mods on a mud bike. Why? It’s usually very straightforward and fast to do, but it surely additionally makes essentially the most noticeable distinction: at the least to our ears…

Whereas we regularly equate a louder exhaust to extra energy, that’s not at all times the case. Some exhaust techniques are simply larger and easily make extra noise, which can sound cool, however they do little to nothing to make extra energy. What they do effectively is annoy your neighbor.

A well-tuned pipe and muffler gives you extra energy and nonetheless not be obnoxiously loud. The TTR125 can profit from a better-flowing exhaust as a result of the inventory exhaust is pretty restrictive.

Low cost exhaust tip – will it assist?

You possibly can take away the inventory finish cap and baffle out of your TTR125, but it surely’s going to be loads louder and it’d even make much less energy – particularly in case you don’t change the jetting.

When you’re on a decent finances however need higher/extra sound out of your TTR with a barely higher throttle response, set up a CNC billet aluminum exhaust tip (Amazon) that rapidly replaces the inventory tip/cap on the inventory muffler. The most important downside is that it doesn’t have a spark arrestor, so it’s technically not authorized for driving on state trails.

Greatest slip-on muffler

Need extra efficiency with out changing the complete exhaust system? The FMF Powercore 4 slip-on (Amazon) is an aluminum muffler that saves a number of weight over the heavy metal OEM muffler.

It’s very straightforward to take away the inventory muffler and set up this aftermarket half to get a significantly better sounding TTR125. It’s best to get a little bit little bit of added energy and throttle response after tuning the jetting, but it surely’s not going to make an enormous distinction by itself.

Greatest full exhaust improve to your TTR125

A whole exhaust system gives you higher efficiency in relation to torque and horsepower. The complete FMF Powercore 4 System (Amazon) is nearly as low-cost as simply the slip-on, but it surely makes extra energy as a result of the top pipe is bigger and flows higher.

It’s positively louder than inventory, however the sound degree shouldn’t be obnoxious. Simply bear in mind in case you experience in a noise-conscience space.

Do that you must alter carb jetting with an exhaust improve?

Normally, sure, you will have to regulate a number of of the jet circuits. Exhaust upgrades will work greatest in case you correctly tune the jetting as a result of they modify the air-fuel ratio.

In case your jetting was tuned correctly with the inventory exhaust, then altering the pipe or muffler will change the jetting, inflicting it to run worse. It could be more durable to begin, have much less energy, poor throttle response, and be much less dependable in the long term till you spend a couple of minutes tuning it.


The engine is the life supply for making your grime bike go quick and may make the most important distinction in including extra energy, however simply since you spend 300 bucks on one half doesn’t imply it’s going to make a noticeable distinction. Extra on this later.

On this part we’ll be all of the doable mods you are able to do to your TTR engine internally that may make a huge impact on the ability output. Nonetheless, I simply need to remind you that in case you don’t tune the carburetor jetting accordingly, you may not see the positive aspects that you simply had been anticipating.

Huge Bore Package – are they value it?

An enormous bore equipment is without doubt one of the best methods to get extra energy out of your TTR125 as a result of it’s turning it into a much bigger engine. When you’re on the lookout for a noticeable improve in energy, a high quality large bore equipment is unquestionably value it – particularly in case your TTR 125 prime finish must be rebuilt.

Growing the engine bore measurement with a much bigger piston alone gives you extra bottom-end and mid-range energy. Extra on this later.

Huge bore equipment vs inventory – set up & reliability

It may be simply as dependable as inventory, if no more so! The most important components are: utilizing good-quality components and appropriately putting in them, in addition to correctly warming your engine up.

So far as set up goes, it’s the identical as utilizing OEM components. When you can rebuild the highest finish in your inventory TTR125 engine, then you possibly can simply set up a giant bore equipment – I extremely advocate choosing up an OEM service handbook in order for you step-by-step directions.

BBR Package – Don’t purchase it with out realizing this!

With the BBR 150cc large bore equipment (Amazon), you’ll get a pleasant increase in low-end and midrange torque after tuning the carb jetting. This equipment matches all years as a result of the TTR125 engine hasn’t modified.

When you resolve to go along with the BBR equipment to get extra energy, be sure you verify the threads for the timing chain tensioner. They’ve been identified to have high quality points that trigger the bolts to strip out.

When you occur to get one with unhealthy threads, contact the vendor, or re-drill and faucet the holes for the subsequent measurement bigger bolt. Apart from that, the BBR equipment may have all the correct tolerances to present your bike a well-performing and long-lasting engine.

Low cost large bore kits – are they value it?

There’s a choice of choices now which you can select from to get a much bigger bore to your TTR125, some are worse than others.

A low-cost off-brand large bore equipment (Amazon) full with cylinder and piston components may match, however the tolerances and high quality of fabric and work simply don’t evaluate to most name-brand elements. The efficiency may be decrease, and the reliability will likely be much less.

Will that you must re-jet with a giant bore equipment?

Normally, sure, you will have to regulate the jetting as a result of the engine is pulling in additional gas. You’ll probably must go leaner on the gas screw and pilot jet, in addition to the needle clip place.

Camshaft – the way it impacts horsepower

The camshaft could make the most important affect on what the ability curve of your engine runs like. The inventory cam in your TTR 125 could be very conservative – low elevate and low length.

It produces clean energy and also you’ll by no means have clearance points with the inventory inside engine components, but it surely leaves loads on the desk in relation to torque & horsepower.

The place Do You Need The Energy?

When swapping cams, you should purchase one which shifts the ability for extra mid to higher RPM energy, or decrease to mid for extra grunt. It will depend on the choice of aftermarket availability and what sort of driving you do.

For instance, in order for you a broad energy curve that’s greatest for path driving and total energy, then you must get a Stage 1 Sizzling Cam (Amazon). The camshaft that comes within the BBR large bore equipment shouldn’t be significantly better than inventory. Upgrading to a Sizzling Cams or Internet Cams camshaft gives you much more efficiency.

Clutch improve – is it truly wanted?

One other weak hyperlink on the TTR is the inventory clutch. When you weigh over 100 lbs and experience at reasonable to aggressive speeds you’ll put on out the clutch fibers as a result of they weren’t constructed for that sort of abuse.

Indicators of Weak/Worn Clutch

When there’s much less distance to engagement within the clutch lever, the clutch engages actually rapidly (so far as lever motion goes), or there’s clutch slippage underneath heavy acceleration are all indicators that your clutch is carrying and needs to be adjusted or changed quickly.

Free/Low cost Clutch Mod

To repair the weak clutch, there are a few easy choices. The primary one is so as to add a washer underneath every clutch spring, so you’ll have to take away the case cowl and take out the bolts and comes holding the clutch basket in.

Including washers/shims which are .030″ thick (.75mm) will improve the preload on the springs, due to this fact making the clutch stiffer to forestall slippage.

It could make the clutch lever barely more durable to tug, however the trade-off is value it in case you plan to place a number of hours into your TTR125.

Clutch Spring Improve

When you’re doing clutch upkeep and have it eliminated, verify the spring size to see if they’re worn previous OEM spec in line with the producer’s service handbook. In the event that they’re shorter/worn past spec, that is without doubt one of the the explanation why your clutch could also be carrying out faster.

You possibly can both change them with some new OEM springs and washers, or you possibly can swap them out for some stiffer clutch springs. They may make the clutch pull even stiffer but, however I extremely advocate this mod in case you are over 150 lbs and are aggressively driving your TTR125.

Head Porting – Not All Porting Is Created Equal

Cylinder head porting is usually an afterthought as a result of many riders don’t have the time or motivation to ship it out to somebody.
They might relatively spend $300 on an exhaust than on porting as a result of it makes the most important noticeable distinction (sound) and is straightforward to bolt on, however the consumption and exhaust ports are choking your energy potential.

If You Are Critical About Extra Energy

When you truly need to get essentially the most out of your TTR125, or any 4-stroke for that matter, you’ll come to seek out out that porting achieved proper is the lacking hyperlink to creating an excellent operating engine.

Inventory heads are supposed to stream sufficient air for the inventory carb, inventory cam, valves, piston, and exhaust… So in case you go larger with these components, the consumption and exhaust ports are simply going to choke it down and restrict the positive aspects.

Consider it as making an attempt to suck a glass of water up with a regular-sized straw. Now strive doing it with a mini-sized straw. It’s a lot more durable to attract out the liquid/air when the outlet measurement is choked down.

Simply Larger Isn’t Higher

When you take your cylinder head to the primary engine efficiency store you discover, chances are high they gained’t know what your head particularly must get essentially the most out of it. I strongly advocate you discover a store proprietor, whether or not it’s 30 miles or 3000 miles away, that makes a speciality of the engine you will have. They may know what it’s going to take to fulfill your particular construct wants.

Lighten Your Flywheel

Let me first clear the air and let you know that including or eradicating flywheel weight does NOT change the horsepower or torque of your engine. Though you could hear from mates or others on the web that they gained energy by lightening their flywheel, that’s truly not the case, technically talking.

The load of the flywheel adjustments the inertia of the engine. For instance, in case you take two bikes underneath the precise circumstances whereas driving on the similar pace in the identical gear however with totally different flywheel weights and let off the throttle, the bike with the lighter flywheel will decelerate rapidly as a result of there’s much less weight/inertia to maintain it going.

Vice versa for accelerating with totally different weights. The bike with the lighter flywheel will speed up sooner as a result of there’s much less weight to maneuver/rotate.

Professionals of Lighter Flywheel

  • Revs faster
  • Quicker acceleration
  • Faster throttle response
  • Much less engine/rotating weight

Professionals of Heavier Flywheel

  • Extra stall-resistant
  • Rolls over obstacles simpler
  • Helps stop wheelspin which equals extra traction.

Is A Lighter Flywheel Value It For My TTR125?

With nearly each mod, there are two sides to its traits. For the TTR125, I’d advocate a lightened flywheel mod to anybody until they’re a newbie rider that’s nonetheless studying find out how to experience and use the clutch.

The heavy inventory flywheel will assist stop stalling, and if the circumstances are slippery then it’s going to additionally assist within the rear wheel hooking up for extra traction.

On the flip facet, the inventory TTR125 flywheel is so heavy that the advantages would tremendously outweigh the negatives for many riders (that could be totally different on different bikes). The engine has so little energy and throttle response that going lighter gained’t make it that a lot more durable to experience.

To purchase a bolt-on lightened flywheel to your Yamaha TTR125 you possibly can click on on the eBay itemizing beneath. However earlier than you order one, be sure you know in case you want one for an digital begin TTR125LE or kick-start solely TTR125 mannequin, as a result of the flywheels are barely totally different.

It All Works Collectively For The Higher Good

You don’t should lay our a fortune to get a greater operating and extra highly effective engine. However, to get essentially the most out of your cash, that you must plan out what you need it to do in a different way than the inventory engine.

Are you on the lookout for a low-end torque-based engine that has clean energy for path driving, or would you like an all-out race engine that’s “set to kill” for max horsepower?

In order for you a torque-based engine, mixing a big carb with a max elevate and length camshaft can be counterproductive as a result of they’re constructed so as to add extra energy at excessive RPM. Because of this you need to put collectively a whole bundle with every part that’s designed for the kind of energy and that you simply need to obtain.

Torque-Primarily based or Excessive RPM Elements Listing

Under is a typical listing of what you must do to your TTR125 (or most any 4-stroke grime bike) for 2 several types of engines. It’s merely a suggestion if you wish to get essentially the most out of your cash to get nice outcomes.

Torque-Primarily based Path Bike Engine

  • Inventory-sized carburetor (or barely larger if including displacement).
  • Excessive velocity porting to match the carb and engine measurement.
  • Excessive compression piston
  • Huge Bore and/or stroker crank
  • Exhaust system tuned for torque (small diameter outlet, stepped, lengthy size head pipe)

Excessive RPM Race Engine

  • Huge carburetor
  • Porting for top RPM
  • Oversize consumption valve
  • Huge Bore/excessive compression piston
  • Exhaust tuned for top RPM (Massive diameter, brief size)

All The Greatest Mods

Final, however not least, is the complete listing of modifications you are able to do to your Yamaha TTR125:

  1. Fork spring/valving improve
  2. Shock/spring improve
  3. Body cradle
  4. Jetting
  5. Air field lid
  6. Airbox mod
  7. Carb swap
  8. Exhaust improve
  9. Lightened flywheel
  10. Clutch mod/improve
  11. Excessive compression/large bore piston
  12. Camshaft improve
  13. Cylinder head porting

One of the best mod for path driving

Organising your TTR125 to your weight is vital, but it surely gained’t do you a lot good in case you have poor driving approach. Need to experience sooner or simply safer with extra management off-road? Click on or faucet right here to rapidly learn to experience with confidence and management.