Thread: Am I too fat? (jets)
04-16-2009, 06:09 PM #1
Am I too fat? (jets)
I've had a quirk with my 951 GSX-L that has me a bit puzzled. Riding in the rough or jumping it will try to foul out, but most times I can clear it by feathering the throttle for a minute or so(but not always). I'm thinking I may be hitting the limiter and then fouling the plug(s)??
Shaved head (PPG did the work) 160 psi +/-
PTO: 172.5/85 Mag:170/85
2.3 N&S; stock spring
choke plates operational (no primer)
Prok filters w/ outerwears
I have a single 167.5 jet and a single 170 in my toolkit. I was thinking of putting the 167.5/85 on the Mag and the 170/85 on the PTO and see what happens.
Am I in the hunt, or am I barking up the wrong tree?
04-16-2009, 07:01 PM #2
Why so rich on the mains? I am running 165's on my 2000xp with proks.
04-16-2009, 07:03 PM #3
- Join Date
- Feb 2006
- Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
I would say you need 165 mains, no reason to go 170's with that compression.
04-16-2009, 07:31 PM #4
Back to the problem, it ran fine until activities that would have put me on the limiter, and then it would lose a cylinder. Unfortunately it's been so long I can't remember which one - they may have even alternated.
This is the engine that's going into the XP-951 project, and I'd like to get the jetting right before I put the carbs on.
Where's a good source with a good selection of jets? Looks like I'm going to need some.
04-17-2009, 06:38 AM #5
I get my carb parts here. http://www.atlanticjetsports.com/jetting.htm
As for getting the jetting right, i would leave everything you have in there, but change the highs to 165. Open the high needle 1/2 to start, and go in from there. Should be real close.
04-17-2009, 07:57 AM #6
i'd go to 160 or 162.5...your way too rich....we run between 155 and 157.5 with 95 or 100 lows
04-17-2009, 11:07 AM #7
04-17-2009, 11:30 AM #8
+1 on 165 mains with 85 pilots (95s w/o pump).
04-17-2009, 11:33 AM #9
did you do a pop-off check on your carbs?
2.3 NS are NOTORIOUS for dumping fuel at any given time or reason.
Another trick is to double up your oblong clear check valves in the jet-block. This will prevent dribbling, from both vibrations and impacts.
04-17-2009, 12:14 PM #10
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