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22 hours in the past | Phrases: Filth Bike Check/ProX Racing | Pictures: Filth Bike Check/ProX Racing
The crew over at Filth Bike Check have ridden and raced their 2020 Yamaha YZ250FX laborious in lots of endurance straining situations, so when it got here time for a whole engine rebuild, they aimed to revive dependable and aggressive energy. Take a look at the small print on this rebuild right here.
Beneath is derived from the official story from Filth Bike Check written by Trevor Hunter, which may be discovered right here. Pictures by Trevor Hunter, Mark Kariya, and Ryan Vitelli
In the previous couple of years, 250F’s have taken over the 250 lessons throughout the board. Whereas thumpers have been the norm in motocross, four-strokes have slowly been phasing out the traditional two-stroke in off-road racing. These days, all the quick guys race 250F’s and it’s been a sizzling minute since a 250 two-stroke has seen the rostrum at a nationwide degree grand prix race. In fact, racers can’t depart their bikes alone and a majority have some type of efficiency mods to try to squeeze each final ounce of efficiency out of their bikes.
Filth Bike Check has been totally impressed with our YZ250FX lengthy haul take a look at machine and when the time got here for a rebuild after 80 hours, the parents down at Yamaha gave them an entire GYTR Excessive Efficiency Head setup to put in. That kickstarted this construct into what it has turn out to be at present.
A giant piece of the puzzle is the GYTR head. Trevor being extra of a two-stroke man, the phrases excessive efficiency and four-stroke being utilized in the identical sentence type of scared him. Certain, the ability and efficiency shall be higher. However at what value? Will or not it’s extra of a headache than it’s value? It seems his worries had been for nothing.
For the reason that motor had 80 hours on it and so they had been going to spice up efficiency inside, they went with a full rebuild. They initially put in the GYTR head and solely changed the highest finish, however some actually laborious racing hours and working low on oil at one level mixed with boosting efficiency took its toll and expedited the lifetime of the underside finish.
They ended up dropping a rod, although they had been cautious to cease using earlier than it did any actual harm. Nonetheless, this referred to as for a full rebuild and so they turned to ProX Racing Elements. They changed the total high finish, rod, and gaskets with ProX components and the primary bearings with Wiseco items. The cylinder might have been reused, however they ended up changing it with a brand new OEM piece since all the pieces was already aside.
Discover ProX parts in your machine right here.
“We’ve used ProX components prior to now and have all the time had actually good luck with their items,” commented Trevor. “They’re sometimes very near, if not pretty much as good, as OEM specs and the standard is pretty much as good as any in relation to aftermarket components.”
Precision Ideas Racing initially valved the suspension and so they’ve been working with them on discovering an excellent all-around setting for this off-road construct. With each desert racing and GP racing within the plans, it makes discovering an awesome suspension setup troublesome however the Precision Ideas stuff interprets properly to the various terrain we race in.
With the motor and suspension taken care of, this construct additionally acquired a Cycra Powerflow Physique Package, Cycra skid plate, DeCal Works graphics, a brand new sprocket, chain, and chain information, new rims, and a handful of different superior bolt-on parts that obtained this bike prepared for off-road racing.
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