has anyone got any experience or knowledge of the performance gains or losses with the installation of these kits, if so which conpanies works the best????. horsepower gains and reliablity.

ARE THEY WORTH THE TIME AND MONEY????

Check out MCBPerformance.com- they do a break down of different mods(pipe,reeds,shim kit,etc.) and the hp increases from a dyno. Without porting, I think it's like 3-4hp increase. Shouldn't be any reliability issues, especially if you just cut the head back down to stock squish.

glad too see your still around butch.

I have done a couple of these and they work quite well and like Butch siad, reliability is not an issue. Good mod for the $$$.

The one i ordered will be here on tues :) I;ll post results.

My 800 has the kit.6500 kms no problems.When i'm set up it runs in the low 120s

who's kit are you using?????

I went with Bill Cudney's kit after many e-mails and phone calls.The price was fair and he has always answered my questions ;)

Anyone blowing base gaskets with the head shim kit mod???

i use yamabond on them to help seal. It is some great stuff! Bill has the best setup and easiest to install and setup. Everything comes in one box.

bad doo- WHere do you live?

800mxz: I live in southern ontario!!!!

Bill is located in Ontario as well.For how cheap the shipping was it wasn't worth the drive out to get it as i'de burn like $50 in gas round trip ;) I'm still waitin for my rings from ski-doo as well.If i don't get em for free someone will be walking funny with a ring hangin outa there arse. :angry:

I would talk to Cudney Racing, he is in Souther Ont also

how thick are the "shims" you are using? anyting over 1mm? anybody?

You looking for 1 mm or larger? Polar Performance in Ontario can hook you up. Let me Know. I'll get you the #.

I use a 1mm shim sandwiched between 2 .5mm gaskets, so the lift is 1.5mm over stock. The shim and gasket stack needs to be "ported" as both hang into the transfers slightly.