I'm getting ready to rebuild my engine in my 03 sp 500ho and wanted to know if anyone know which piston kit seems to do the best in these engines ?

 

I prefer to use Wiseco over stock,plus cheaper,better quality forged piston.

 

I've always used Wiseco myself for the same reasons as OPT states. The only drawback IF you can call it one is when using Wiseco especially when using them in snowmobiles is that a short warm up period is a must if you want to get the full benefits of using them. For some reason - maybe because they are beefier-forged or just the higher quality material it takes a few extra seconds of warm up to avoid cold seize scoring in the cylinders, or at least that's been my experience. I say the few extra seconds is well worth the extra quality and benefits of them. JMO.---------Question for you though--how come your machine needs rebuild already if it has only the 1100 miles on it you have listed?

 

Well, it was smoking alot. Then I ran it today some and it seemed to smoke less and less as I road it. I was using 10w-40 then i switched to 0w-40 on my last oil changed after it started smoking.

 

is it more likely that your valves are in need of adjustment? possiby just a leaky valve guide?
Just a thought after reading an article in this month's in "dirt wheels". check it out