Thread: 90 mm pistons
12-09-2007, 12:01 PM #1
90 mm pistons
I was just wondering if anybody has a motor with 90mm pistons. If so what heads are you using??
12-09-2007, 12:30 PM #2
12-09-2007, 05:34 PM #3
12-09-2007, 07:34 PM #4
Just tryen to fig out what I want to do. It seems to me that when people start going big bore they disable the powervalves. With my 06 thats one step I can skip. and if Im going to bore it, its gona be BIG.
12-09-2007, 07:35 PM #5
12-09-2007, 10:12 PM #6
I think you should use the head that matches the cylinders you use.
With either head (1200 or 1300) the 1300 gasket tends to seal better - use the 2005 GP1300R head gasket.
with these big motors power valves are not needed
The 3 different cylinder choices have different port timing - that is the more complex issue that has to be decided
Last edited by philip_gpr; 12-09-2007 at 10:16 PM.
12-10-2007, 12:37 AM #7
12-10-2007, 02:39 AM #8
- Join Date
- Dec 2006
Billet heads for 90mm
We make billet heads that will support up to 90mm. We can sell them in sets of three for $525 or $650 with girdle hardware. Here is a link https://www.waterdawgkustomz.com/pro...?prod=GPBB-BHK
12-10-2007, 08:47 AM #9
12-10-2007, 10:33 AM #10
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