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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Engine » Fuel System: EFI/DDFI, Carb., Filter, Pump, Tank, Filler-Cap, Fuel » Archive through January 26, 2009 » Re jetted M2 Carb stalls after 30 seconds « Previous Next »

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Buellfart
Posted on Tuesday, January 20, 2009 - 04:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I just re jetted my carb, as overly described before-sorry- now it stalls after 30 seconds,won't restart, wait 15 minutes- same thing. I pulled the tank vent,I adjusted the idle needle jet (the one that has to be unplugged to get at) to 1-1/2 turns out from seated position. Is it running too rich, intake leak? Had some trouble routing fuel line around idle adjuster- no room. Should I try 3-1/4 turns out as second carb was, this is another carb on the bike?
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Buellfart
Posted on Tuesday, January 20, 2009 - 05:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Could it be that I tore the vacuum piston rubber? Seems to function smoothly.
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Sparky
Posted on Friday, January 23, 2009 - 01:54 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

When it stalls after running for 30 seconds, can you tell if it stalls from gas flooding or starving?

If it is starving, it could be the idle jet passages are clogged with stale gas varnish or a dirt particle. A quick blast with carb cleaner spray into the jet hole of the idle mixture screw should fix that.

Have you changed the float needle or checked to see if the float level is in spec?

If the float is not operating properly, that could be a problem. For instance, if the float sticks shut, it won't let gas into the float bowl. If the float level is too high, the carb can flood or run erratically rich; if it is too low, the carb can run lean or seem to starve at certain rpms.

You can check the piston diaphragm by looking into the mouth of the carb when the engine is idling and then revving it. If the piston raises, the diaphragm is OK.

By the way, make sure there is no water in the gas. A quick check is to remove the float bowl and see if there is any sediment or debris in the gas.
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