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Carb Jetting
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As evidenced in past RMD threads, I'm not a genius at carb
jetting. My bike appears to be jetted perfectly for the conditions
here though. No blubbering anywhere in the throttle range. Our
elevation is around 600' above sea level.
That said, I realize that at 5,100'+ I'll likely need some changes
for Baumgartner. My carb is the Mikuni VM38SS. The stock settings (I'm
not sure what the current settings are because I never wrote them down
and the bike's in storage right now) are:
Float level: 10.9-11.9 mm
Needle clip: 2nd groove
Jet needle: 6FJ40
Main jet: 320
Needle jet: R-0
Pilot jet: 50
Slide cutaway: 4.0
So can you guys tell me the most likely components needed to rejet
for the higher altitude? I mean, would I start with *higher* number
jets? Are the main and pilot jets the most common switches for
re-jetting (along with needle clip adjustment)? How many different
sizes should I buy? I just wanna be prepared without buying a lot of
unnecessary stuff... like what are the odds of needing a new slide
cutaway, for example?
Thanks, kids.
CrashTestDummy - '85 RM-250
f.j.bradfordREMOVE@verizon.net
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Open you carb and determine what you currently have in there.
Bring the next 3 leaner main jets and the next 2 leaner pilots. That
should cover you. I would put in a main jet that is 2 sizes leaner
and a pilot that is 1 size leaner before even loading up to go.
Mike Baxter --------------- "All GasGas, All The Time"
2005 GasGas EC300, 2000 GasGas EC300, 1997 GasGas JXT270
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That advice is on the money for all three bikes I've brought out there.
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Kewl beans! Thanks guys!
CrashTestDummy - '85 RM-250
f.j.bradfordREMOVE@verizon.net
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Here's a link with carb basics:
Using 6000 ft and 68°F you're looking at a 0.92 correction factor.
Main - 320 x 0.92 = 294 mains in this size range are in increments of
10, 290 or 300 would be a start.
Pilot - 50 x 0.92 = 46 pilots in this size range are in increments of 5,
45 would be a start.
Needle - raise the clip a notch to start out.
Air screw - leave it alone to start and tweak when you get there.
The rest - leave 'em alone.
If none of this works, ride Baxter's GG.
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CrashTestDummy - '85 RM-250
f.j.bradfordREMOVE@verizon.net
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