Need help with carb adjustment..
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Stage III
Joined: Nov 2020
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From: Stockton
Need help with carb adjustment..
Hello I'm a mechanic for trucks and learning bikes..I have a 1995 harley-davidson sportster xlh1200..I removed and rebuilt my s&s super b carburetor with a complete kit and I know i need to time my motor but haven't yet, waiting on timing light...the motor fires right up and sounds good with the idle adjustment at about 2 turns out from bottomed out...
is that about where air fuel adjustment screw belongs?
I turned it in then out two and it fires up and sound good, then I turn it out richer mixture and then I go and lean it out until its about to die, then i turn it back out just enough to where it sounds good and revs up pretty good, but, I noticed it doesn't sound good hitting the higher rpm range and I'm thinking it needs timed...I have a repair manual and been referring to it...I feel like I'm real close to getting it just right.
Any suggestions will be greatly appreciated, thank you
is that about where air fuel adjustment screw belongs?
I turned it in then out two and it fires up and sound good, then I turn it out richer mixture and then I go and lean it out until its about to die, then i turn it back out just enough to where it sounds good and revs up pretty good, but, I noticed it doesn't sound good hitting the higher rpm range and I'm thinking it needs timed...I have a repair manual and been referring to it...I feel like I'm real close to getting it just right.
Any suggestions will be greatly appreciated, thank you
Last edited by Gary Harriss; Nov 12, 2020 at 08:42 PM.
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From: Dallas, Texas
1) There's no choke. Only an enrichment device used for starting. Lift it up and rotate slightly to enrich the mixture and down to shut it off. Use to prime engine with ignition off. Can be left on temporarily with some open trottle, iginition on, during warmup.2) Start with idle mixture set One and One half turns out from closed. And throttle adjustment screw out 1/2 turn. Do no over tighten to find closed position.
3) Start engine and run until oil and engine is warmed-up, and adjust throttle stop until you get 1000rpms.
4) Adjust idle mixture both in and out until engine begins to die. Put the idle mixture screw between those two points.
3) Start engine and run until oil and engine is warmed-up, and adjust throttle stop until you get 1000rpms.
4) Adjust idle mixture both in and out until engine begins to die. Put the idle mixture screw between those two points.
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Stage III
Joined: Nov 2020
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From: Stockton
So on number 4. you say idle mixture both, you mean turn just the mixture in and out or both idle and mixture in and out?
Last edited by Gary Harriss; Nov 15, 2020 at 10:26 PM. Reason: Correction
Idle mixture. You are leaning in until it slows and richening it until it slows. So if you leaned it and it slowed, then started richening it until it slowed and that was a 2 turn distance, you would come back 1 turn so you are set in the middle of the lean and rich drop off points.
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