Thread: Gutting gpr waterbox (100 rpm)
12-06-2009, 08:53 AM #1
- Join Date
- Feb 2006
- EAST COAST
Gutting gpr waterbox (100 rpm)
Ha Ha Ha!!!!just kidding about the 100 rpm but! Has anyone ever tried doing this?I know there has been a recent thread on the 4 stroke section about gutting out the waterbox. There are some possitive results on the 4 strokes so what about the 2 strokes?
if i had an extra box i would try it and see!!! i was thinking of gutting it out but yet leaving the sound supression in.I cant see what it would hurt may not do anything at all except make it a lil louder. whats everyones thoughts on this?
12-06-2009, 10:46 AM #2
Well the first thing that come to mind is your going to reduce back pressure. this is a good thing for 4 stro but BAAAAD for 2 stro
12-06-2009, 11:16 AM #3
bad idea to gut water box on a 2 stroke you will lose a lot of rpm's, 2 strokes need back pressure.
12-06-2009, 06:38 PM #4
12-06-2009, 08:37 PM #5
Gutted box on a GPR with tripples requires 26mm stingers (32 is FPP standard) to get the right back pressure. This is for 1200cc all out race motor on MS109
12-06-2009, 10:46 PM #6
12-06-2009, 10:53 PM #7
Backpressure is important for a two stroke.
12-09-2009, 09:09 PM #8
- Join Date
- Apr 2008
What backpressure would be required on a 1460 running tripples??
Anyone?? Stingers between 32mm and 26mm or just 32mm??? Is anyone running a factory waterbox with a 1460?
12-09-2009, 09:59 PM #9
12-10-2009, 11:22 PM #10
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