Just doing rebuild on my 99 gp1200 using 84.5 pro-x pistons more porting work and pistonwash water routing mod with jetworks valve instaled. He also lists to run a raider 1100 exhaust gasket is 1100 gasket better than 1200 has anybody done this mod and did it make any diference maybe Mike can explain the diference.

I put one on mine during my rebuild last spring. The 1100 gasket has the same size holes for all cylinders as were the 1200 only has larger holes around cylinder #3 I think. You should be able to check out pics of the gaskets on Pat's website - extremeteamracing or something like that.

No real gain in performance, but more for peace of mind since your ski should be running a little cooler.

Yep, what superd said.

Yes..what Dave said. The 1100 has the larger holes allowing more water flow. It helps.

Mike

But the rear cyl is always runs hotter true ? so wouldnt you want more flow to the rear cyl.

the main reason is the 1100 and the 1200 have the water entrance niple on a diferent position the holes on the gasket helt to distibute a equal amount of water for each cilynder any change may lead to a cooling faliure

Now i dont know which gasket i should order has anybody had any trouble running 1100 gasket and how long have you been running it for now i am not sure i dont want to destroy my new motor.

I have 15 hard hours on the 1100 exhaust gasket on my 1200. No problems. I put it in per Pistonwash's suggestion. I am sure he has a lot more hours than that on his engines. I have held this engine wide open for 20 minutes at a time. Jetting is more of an issue for heat.

When I bought the 1100 gasket at Pro-Tec they told me they were familar with using that gasket on 1200's