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You don't need to resleeve GP800 cylinders when going to a larger piston. You can bore them to 84mm or even 87mm and just replate them. On GroupK's 1390 kit for the GP1200, they just bore the cylinders to 87mm and replate them. And you don't need to replate cylinders after they are...

The actual valves you have to get from Dan. They are custom made for his cylinders. As far as the SEA-DOO parts go. The bases are from a 782. The locating pins on the bottom need to be milled or ground off to make them work though. As far as the rest of the parts are concerned, shouldn't...

Are you running a flat-top set-up? Or 760 domed pistons? And do you know what cc domes you have and your bore size? As far as porting goes with our pipe, you should be fine running a ported cylinder with our pipe on 92 octane. The thing you have to be careful of is ignition timing and...

How did you reverse the check valves for your high speed circuit? And the check valve for your high speed circuit shouldn't have any affect on your pop off pressure. So if you still aren't holding any pressure in the one carb, you need a new needle and seat.

Wes, You can go back to the stock restiction in your return line. Just install a 60 main jet instead of your 70. And that should actually cause it to run a little richer.

Well, if your pipe looks just like the pipe you posted, then it ISN'T a Speedwerx pipe. The one you posted a picture of looks like the Riva freeride dry pipe. We produced some of our pipes for Riva back in the day and I believe Riva called it their high rev dry pipe. It was exactly the same as...

The UMI steering kit for the square nose and round nose are exactly the same. The reason the part number and price are different is because UMI includes a handle bar pad with the round nose kit. So if your going to run their freestyle bars with the pad on the bars, you can order the square nose...