I need TECH HELP!!!

[brap337]

I have a 2001 CR 125 with some mods to it. I have a Phat Heads Racing head on it, vforce reeds, FMF fatty pipe, flat top piston kit. Im having problems with keeping the top end intacted. It seems like I have to put a new top end in after every other weekend of either riding or racing. Im using the recommended 32:1 fuel to oil mixture and Im running premium gas with motul oil. Does anyone have any sugestions or has anyone delt with Phat Heads before.

 

[robwbright]

Does the cylinder measure within spec?

What symptoms are telling you that you have to put in a new top end?

 

[brap337]

I bought a OEM cylinder last year so i know that it is good.

The symtom that is telling me the top end is bad is not compression what so ever and when i take the top end out the ring is always stuck in the piston land. I emailed Phat Head Racing last night and they told me to run 100+ octane gas to cool the engine more.

I have another Question too.

What do flywheel weights do?

 

[NacNac250F]

If your running pump gas in a race gas setup detonation could be your problem. Try running race gas with your next top-end and see what your cylinder walls look like, see if theres burn marks or if its scored.

 

[Chili]

Those Phat Heads come with different domes for the head don't they? I thought that was their gimmick. If so run the lower compression one for pump fuel or run the pump gas with the high compression dome.