Question about 2000 Harley Davidson FLSTC Heritage Softail Classic

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S&s carby running very lean why? - 2000 Harley Davidson FLSTC Heritage Softail Classic

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If this is a new installation, your carb may not be jetted correctly or if the carb has been running for a while, you may have a vacuum leak somewhere. Your carb should be jetted 29.5-31 on the slow jet and 72-74 on the main with your 88" engine. If you've modified the exhaust, the jetting could varry a bit from that.

If your carb has been running for a while with no problems and you haven't changed anything and it's suddenly started running lean, I'd remove the carb and go through it. Check all the jets to make sure they aren't partially blocked. Check or replace the intake manifold gaskets where they join the heads. The carb has a vacuum takeoff point as well. It should have a hose supplying vacuum to your VOES and the vacuum operated petcock unless these items have been removed or replaced. Make sure that hose is in good condition.

Also, when you pull into a gas station, look on the pump and see what percentage of ethanol has been added to the fuel. Although I haven't seen it and cannot verify it, I've heard talk of some stations selling fuel that has more than 10% ethanol blended in with the gasoline. Since ethanol is basically alcohol, it will run leaner than gasoline with the same jets.

Good Luck

Posted on Nov 06, 2010


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I have a couple of suggestions for you.
Your symptom sounds like your bike is running lean(problem improves with choke).
Add that to your other symptoms & it sounds like your bike is sucking air at the inlet tract(front of carbies).
I recomend that you check that any hoses that may be fitted to your bikes inlet manifolds,arn't damaged or split.
If you find they seem fine,try running the bike,& while it's runnung,spray some WD type spray on the manifolds at the front of the carbies(use the nozzle).Be sure to spray the joint of the manifold where it bolts/is clamped to the cylinder head.
If any leaks are present,the engine speed or smoothness will change(as the WD gets sucked in through the leak & then changes the fuel mixture).
Another way to check is, using a piece of hose(about500mm long)place one end in your ear &use the other end as a probe to search for leaks while the engine is running.If there's a leak you'll hear it through the hose in your ear.
I hope that my guess is right & you should find a leak there somewhere.
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Kind regards Andrew Porrelli

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