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General Category >> Rubber Side Down! >> Worse running with increased altitude - lean/rich?
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Message started by voldigicam on 10/21/09 at 16:41:20

Title: Worse running with increased altitude - lean/rich?
Post by voldigicam on 10/21/09 at 16:41:20

Too tired after 200 plus miles of mostly twisties. So I can't figure out whether worse running on the pilot jet at altitude means it's lean or rich. The main jet is fine. I do have only about 1/3 of white space thickness.

Bike stuttered badly on the pilot at 5000 ft. From off idle to just under 1/4 throttle, improved to a little over 1/4 throttle, fine from there to full throttle.

Any non-exhausted brains remember how this works?

Thanks!

Title: Re: Worse running with increased altitude - lean/r
Post by Serowbot on 10/21/09 at 16:47:19

too rich... ;)

Title: Re: Worse running with increased altitude - lean/r
Post by voldigicam on 10/21/09 at 16:51:19

Cool, I can fix that I suppose. Enough to increase spacer perhaps? Maybe I'll try that first. I have very little spacer really.

Think I'm running a 52.5 pilot with holes. I have one without holes. I suppose that makes a difference.

Title: Re: Worse running with increased altitude - lean/r
Post by vtail on 10/21/09 at 17:34:26

Standard pilot, 152.5 main, NO spacer, MAC exhaust. No issues even at 5000 ft. At 12000 miles, spark plug looked almost new. :)

Title: Re: Worse running with increased altitude - lean/r
Post by BurnPgh on 10/21/09 at 23:54:59

If you arent going to be at altitude for long-
runs crappy just on pilot circuit - turn the idle adjust screw in to lean it out
runs crappy on all circuits - remove the cover for the airbox
If you're going to be at altitude a while you might aswell just rejet.

Title: Re: Worse running with increased altitude - lean/r
Post by Routy on 10/22/09 at 04:33:20

Thats why a touch on the lean side at sea level is fine for me. That way I won't be in trouble when I get into altitude now and then. I just know not to be cobbin it too hard in hot weather here at sea level.

Title: Re: Worse running run a tochased altitude - lean/r
Post by bill67 on 10/22/09 at 05:14:20

I run a touch on the lean side,but can tell it runs stronger the warmer it is.

Title: Re: Worse running with increased altitude - lean/r
Post by Digger on 12/16/09 at 19:29:35

FWIW....

The jetting, inlet, and exhaust on mine (see signature) are all stock. I have fiddled with the pilot screw a bit.

I live at 6500' above sea level and my bike runs great up here.

It also ran good in Houston, TX, but it backfired more down there.