Thread: Carburetor Jetting ~ Help
07-11-2007, 08:54 PM #1
- Join Date
- Jul 2007
Carburetor Jetting ~ Help
Need help with carb jetting and adj. with these modifications. D-Plate & Chip, Air Filters, Acel. pump removed, oil pump removed, and oil mixture 50:1. Idle is fine. Boggs up to 4000rpms, 4000rpms and up runs great. Any suggestions or known fixes would be greatly appreciated. Thanks
07-11-2007, 09:10 PM #2
Welcome to the forum, You did not post what kind of ski but i see you put a d plate. So i guess it's an gpr 1200 if that is correct (pilots 110) (mains 120) 1.5 needle and seat and 95 gram springs. Start at 1 turn on lows ans 1.5 turns on highs that is a good start.
07-11-2007, 09:12 PM #3
07-11-2007, 09:59 PM #4
I did the same as Jims1300 mentioned but have learned with the 125 mains you have more room for adjustment (start at 1 turn out)
07-11-2007, 11:26 PM #5
both suggestions are very good advice. If you have removed your chokeplates definately go with the 125 mains. I would lean towards the 125's. I have run 120's for 100 hours with no problems and my 1200 is right up there as far as fast goes. There is a little more safety in the 125's though.
07-12-2007, 07:41 AM #6
50:1 on the oil mixture? That's a little light IMO. I'd run more like 40:1.
Spud knows his stuff, so I'm not disagreeing with him on this - just relaying my personal experience. I think 125's are too rich for your setup. I run 125's with a ported 1300.
07-12-2007, 09:09 AM #7
07-12-2007, 10:07 AM #8
- Join Date
- May 2005
First of all what is youe elevaton, and go 32:1 premix.
Spud does not get 93 octene out there so that is probably why he running a bit fatter also
Boggiong up to 5k rpm could be your power valve servo motor acting up also
Last edited by Fercho; 07-12-2007 at 10:09 AM.
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