Love a fresh motor

[AZRickD]

For the last few months I've been hearing top-end noise. "Power valve" said some. "It's just some piston slap," said others.

I got a Wossner A-sized piston kit from (can't remember who) and slapped it in there. Nice, powerful, quiet motor again. Lovin' it.

[eff]

I'm due as well.

[AZRickD]

The piston (Vertex) was about 2.5 years old (2nd one in the bike). I did the squish band mod just after that and compared it by swapping a buddie's spare head. Like night and day.

I had re-ringed it about 15 months ago -- that freshened it up as well.

I noticed the noise beginning last November and waited all this time to pop the top.

[GMP]

Don't let a cast piston rattle around in the bore like that, it can drop its skirt.

[desertgasser300]

I just ordered a wossner kit for mine. I have always used wiseco. What was your impression of the piston when you got it?

[AZRickD]

It looked fine. The kit included everything I needed including the wrist pin bearing.