700cc Two-Stroke Supermoto! – BikeBound

GasGas “EC700” Supermoto from Sib Mustard…  

For many of us, the Honda CR500 and Kawasaki KX500 signify one thing akin to the apex predators of the two-stroke dust bike world — 500cc people who smoke notorious for his or her light-switch powerbands, violent soundtracks, and deadly reputations.

In fact, when talking of such insane machines, any rational hot-rodder has to ask: what in the event you may…go greater? In spite of everything, for some pace freaks, “quick sufficient” simply doesn’t exist. Within the phrases of Hunter S. Thompson:

“On my tombstone they may carve, IT NEVER GOT FAST ENOUGH FOR ME.” -Hunter S. Thompson, “Music of the Sausage Creature”

GasGas 700cc

Enter our new buddy Sebastian “Sib” Senft (@sib_mustard) of Germany’s HAISL — a bike-builder and two-stroke lover who’s earned a big following on social media for loopy customs just like the 700cc two-stroke supermoto you see right here.

GasGas 700cc

The bike started life as a GasGas EC300, a light-weight two-stroke designed to deal with the gnarly terrain of exhausting enduro.

“That is the lightest enduro bike I’ve personally ever ridden… On our scales, amazingly the EC300 weighed in at 106kg [234 lbs] with ½ a tank of gasoline in it; even lighter than the spec sheet.” –Planet Knox

However Sib had different plans for the powerplant, modifying the body to just accept the 699cc liquid-cooled two-stroke Mega engine from Austrian firm Rübig Motortechnik — an engine designed for sidecar motocross!

This required not solely body modifications, however a customized swingarm, rear shock mount, exhaust, and extra.

GasGas 700cc

Sib says he needed to construct a “wolf in sheep’s clothes,” preserving a lot of the normal GasGas design language however with a black and copper coloration palette impressed by the Cupra R.

Aptly sufficient, Sib has nicknamed this monster the MEGAGAS:

“I needed to maintain the unique GASGAS design, therefore the massive MEGAGAS lettering, however with steampunk parts as a result of it suits effectively into the colour idea.”

GasGas 700cc

Although Sib hasn’t had an opportunity to get the MEGAGAS on a dyno but, he says the engine is rated at 84 hp. When you may count on such an enormous engine so as to add a ton of weight to the bike, Sib says the Mega engine is simply 10 kg (22 lbs) heavier than the unique GasGas engine, that means the bike weighs 115-120 kg (255-265 lbs) — about the identical as a CRF450X!

GasGas 700cc

As you may count on, the vibration is gigantic — particularly because the engine has no balancer shaft — however consolation was by no means the secret when coping with big-bore two-strokes.


All in all, this is among the wildest people who smoke we’ve seen, and Sib is simply getting began.

“My subsequent undertaking is already being deliberate and I’ll try a 2-stroke turbo construct.”

We are able to’t wait, man! Beneath, discuss to Sib for extra particulars on this “EC700” MEGAGAS.

GasGas “EC700” Supermoto: Builder Interview

700cc Supermoto

• Please inform us a bit about your self, your historical past with bikes, and your workshop.

I’m Sib, and I’ve all the time beloved engaged on bikes. Once I first received my driving license, I additionally labored on vehicles lots. Sooner or later I received again into two-wheeled enduro sports activities and, by means of social media, into supermoto sports activities. I don’t have a workshop the place I construct bikes to promote; that is my workshop the place I solely construct bikes for my content material on social media. Lots of my followers solely know me by means of my loopy and detailed builds.

700cc Supermoto

• What’s the make, mannequin, and 12 months of the donor bike / engine?

It’s/was a 2021 GASGAS EC300.

• Why was this bike constructed?

It’s my content material on social media, and I usually attempt to make builds which have little precedent or don’t exist. My subsequent undertaking is already being deliberate and I’ll try a 2-stroke turbo construct.

700cc Supermoto

• What was the design idea and what influenced the construct?

When it comes to coloration, I used to be impressed by Nissan Cupra (black and copper). I needed to maintain the unique GASGAS design, therefore the massive MEGAGAS lettering, however with steampunk parts as a result of it suits effectively into the colour idea.

700cc Supermoto

• What customized work was performed to the bike?

Primarily modifying the body in order that the 700cc engine suits in. I significantly needed to protect the unique look of the GasGas (wolf in sheep’s clothes). The damper mount of the particular swingarm was additionally adjusted with particular CNC work.


• Does the bike have a nickname?

Sure, MEGAGAS, as a result of it’s a GASGAS and the 700cc engine producer known as MEGA.

700cc Supermoto

• Any thought of the burden or horsepower?

It’s simply the heavy engine that makes the distinction. In any other case every part is identical as with an unique 300 GASGAS. I haven’t weighed it nevertheless it’s solely 10kg heavier. So round 115-120 kg.

I haven’t been on the dyno with this machine but, however in keeping with the engine producer, this engine ought to produce 84 hp.

GasGas 700cc

• Are you able to inform us what it’s wish to journey this 700cc smoker?

It’s undoubtedly not a touring bike. This engine comes from sidecar racing and is an outdated idea, so it doesn’t have a balancer shaft. The vibration is gigantic. You don’t need to journey it for a very long time.

• Is there anybody you’d wish to thank?

My principal sponsor HAISL, the opposite elements sponsors and my followers, who make financing my initiatives a lot simpler.

GasGas 700cc

Construct Images

GasGas 700cc

Comply with the Builder

Instagram: @sib_mustard
Youtube: @sib_mustard
Principal Sponsor: www.haisl-shop.com | @haisl_official