How often should you replace the top end on a thumper?

Question

A YZ 250F to be specific.

I know 2 strokes need a new one roughly every 40 hours or so, but what about thumpers?

And wiggysan, dont bother answering this question if youre going to be an a*****e about it.

Thanks,

241

Answer 1

I was going to use google and find out the info you needed, no doubt via the the Yahama Factory Racing website................ but I guess I wont bother now.

Why would I be an a*****e about it ?

You have a Racing question , in the Racing section.

That's 100 % in my book. Its the fools who ask about taking reflectors of bikes and about how to become a nurse in India that bug me.

Your question is bang on.

Like I say, try Yamaha or BB, they will have the info you need.

Answer 2

every 4 month

Answer 3

thumpers need one about every 80 hours but with four strokes it can vary so its hard to say how many hours like a two stroke but whenever it becomes easier to kick and when you notice a loss of power you definately know