Have to totally agree with you i also run Wiseco's in my race engine and SPI for the trail sled.madcow said:wiseco's in the 800 xcr is .0025" that is a lot tighter than stock.
i have no problem with wisecos other than the cost and care for a trail sled. in a race sled they are the only way to go as well as prox brand.
oem is great but spi's are a tiwan knock off that i have had good luck on many many sleds and they are cheap in price!
Yea Namura makes all of the pistons for SPI, SPX, etc. They all have a little N with a circle around it on the inside casting of the piston. Excellent pistons, used them before, will use them again. I have no idea why they run them under a mystery company like SPI and not roll with just Namura. Playing Twighlight Zone music...MaxTrax said:I think my sled has Naumara (sp?) pistons in it. I WILL not run weisco's in a snowmobile as stated by everyone above. SPI is an awesome piston that has done me good also. Naumara or SPI is my vote.