mixture; L-series Dec85, ea82, carb

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rafnics
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Posts: 13
Joined: Sun Mar 09, 2008 7:17 pm
Location: Darwin

mixture; L-series Dec85, ea82, carb

Post by rafnics » Sat Aug 15, 2009 3:06 pm

Do you drill through the top of the "mixture screw cap" to get at the mixture screw? Or can I pull it off if I pull the carby out (again)?

There's a bigger story... basic amateur carby overhaul; now have backfiring in exhaust when changing gears up unless I'm very gentle. Played with timing and distributor is now at full rotation.

Seem to be using more fuel, have a fuel smell, and what seems like fuel smoke. I've put the hose onto the carby while running and nothing happened, so I'm taking that to confirm that I sealed it back up ok.

Maybe there are other things I need to check (new spark plugs, leads, ...), but this all happened after I cleaned the carby out, and really looks like too much fuel going in to me (but, then, I'm pretty amateur even on my good days!!)

cheers,
Francis

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Busdriver
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Joined: Fri Oct 12, 2007 7:53 pm
Location: albury

Post by Busdriver » Sun Aug 16, 2009 11:15 am

Drilling out the cap to get at the mixture screw wont help by the sound of it, you have a problem somewhere else in the carby. The mixture screw only changes things at idle.
Sounds like its runnung too rich. You may have a thing in the carby thats called a power valve in the bottom of the float bowl. It is usually closed and a drop in manifold vaccum, ie full throttle, is when it is opened and it may be not shutting properly now and therefore letting in more fuel than what is required.
[SIGPIC][/SIGPIC]Busdriver, 91 L Enduro Wagon, stock ,for now.
Lots of Ks,A/C, MP3 sometimes(if its not dark) singing steering wheel cover which I listen too when its dark.

Suby Newbie

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