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I run 36 pilot and 96 main on my yx140. Race cam and lightened flywheel only mods to engine. runs spot on all the way through Rev range.

Wicked. I fitted them using original lower triple clamp and stem with the original bearings used the gpx top clamp so got to use the new blingin bar clamps too. New cnc hub wheels got a bit scratched fitting tyres! See how it rides tomorrow I guess.

Ok that might be a good option. Anyone know the diameter of the stem where it presses through the lower triple?

Hi guys, I have purchased a set of GPX Black Label Front forks 660mm. I want to fit them to my bike. It's an older crf50 copy frame (I believe). from my research it looks like the head stem bearings will not fit my frame, I haven't stripped my bike yet to measure O.D's of mine but sounds like...

yea piston right way around:) didn't measure the squish stripped back down this arvo, no signs of piston to valve touch, no piston to head marks either. Found the problem, the steel headgasket wasn't centred on the bore. the dowels held it in place so that at tdc the edge of the piston made...

yea checked them again, then tightened them up too much but noise is still there. set them back to spec. might be detonation, I'm running it on 91. I will try again tomorrow with 95-98 see if that makes any diff seems a bit loud to be just pinking tho... might pull it down again and fit a base...

ok so I stripped the engine down today, honed the bore (looked ok). rebuilt it without a base gasket to up the comp a little, just a thin smear of silicone. cam timing spot on. adjusted valve clearances. spun the engine by hand not issues. started it and ran it up. loud tapping noise upper...

wouldn't that end up retarding the cam timing slightly. chain tension issues? i'm just annoyed. might just end up ordering a proper high comp piston from somewhere else.

Piston arrived today. it is just a standard piston! Called DHZ they told me it is a standard yx140 piston as they come high compression from new. Bit disappointed as I was expecting compression gains. I don't think they should advertise them as high comp if they are really just standard...

yea should have mentioned I have gaskets coming with it. can I use sandpaper to rough up the cylinder or should I really use a honing tool? anyone done this mod before and had good results? ( the piston not the sandpaper!)

Hi I have a question regarding the fitment of a high compression piston to an otherwise stock yx140 engine +( oko26 s38 m96 ) (outer rotor kit ooracing) This piston I bought from DHZ ( 56mm 13mm pin). can I fit the piston with no worries or is there anything else I should do? thanks in...

Bike model: CRF50 mash up Engine Model and capacity: yx140 Engine Spec - stock or modified - list mods:28mm exhaust, ooracing ork carby model and Internal Diameter: 26mm oko flatty Jetting specs and Jet Type used: 36 pilot , 96 main , jjh needle middle clip , mixture screw 1 1/4...

hey i'm running a yx140 with no mods(yet) except for a big bore exhaust i've been looking at a full race ignition kit from ooracing VMR118 is this kit what is meant by an ORK? does anyone have any experience with these, what sort of diffrences will i notice in power and will i loose down low...

i've read somewhere that there's two different versions of the yx140 heads, one with smaller and one with larger valves? is this true, and how could one tell which are which?

Hi i'm knew here, can anyone tell me how i can tell whether my Yx140 engine has the larger valves without pulling the head off and actually measuring them?