ATV Florida Forum

Do Hotcams negatively affect reliability at all?  More specifically 05 yz 250f?  Thanks in advance.

if installed right they make it better

Yes they do, but not to bad.

All a performance cam does it hold the valves open longer. No adverse affects.

on some dynos i have seen hotcams actually made the motor loose power in low and mid range and only picked up 1-2 hp in the very top of the rpm range. i had them in my yfz and hated them. they maybe different in the yz250f but my experience with them i would stay away from them  IMO

a bigger cam should be accompanied by a higher compression piston because you loose compression with a bigger cam.  If you have both they work together and you can deffinately notice it.  The only thing I have seen is my brothers hotcam put 2 valves through the piston 1 on each motor.  idk what was up but obviously something like his timing chain was stretched for he had it advanced a tooth or something.  If done correctly theres nothing to worry about you just have to adjust the valves a little more often.

Thanks for all of the info everyone.

Not true, the longer the valve is open the harder it is on the valve and springs. It's not that dramatic but does decrease some reliability, I wouldn't worry about it unless your running a high compression engine.