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carb adjustment, enrichener, sportster 1200

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  #1  
Old 2nd November 2013
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Default Do I need a new carb?

I have a 2001 Sportster 1200 (stock engine, stock cams, SE Air cleaner and RB RAcing 2:1 pipes) with a Keihin carb that has been dynojetted.

I have been having running problems with the bike for a while (too rich) so last week I bit the bullet and sent the bike off to a recommended dyno tuner.

They replaced the hoses, changed the plugs (previous plugs had only 200 miles on them) and fitted a 170 main jet and a 45 pilot jet.

The fuel enrichener screw has been stripped and is all the way in and can't be adjusted.

This is the results that came back.



As you can see, the AFR is all over the place.

My concern is because they have not been able to adjust the enrichment screw, will the carb will always run badly until this part is replaced?

I guess there is only so much you can do with the pilot jet.

My question is, can I bodge it with the pilot jet adjustment, or should I get this carb replaced?
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Old 2nd November 2013
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Try ebay..and I would replace the carb.
And look into a new tuner , 8 runs barely warmed.up the bike.
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Old 2nd November 2013
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Default

I'd think if you bodge it you're going to be chasing the problem around and always have a spot where it runs poorly. I've not had an enricher screw strip, so I wonder if it can be repaired rather than replaced?
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The mixture screw is primarily responsible for your cruise/low RPM setting. If that's messed up, you'll likely be having trouble in normal riding.

I also dislike the dynojet kits. They can wear out and I was never able to tune mine properly. I switched to a CV Performance kit, and it's 1000 times better. I was able to dial it in perfectly and it runs much better.
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  #5  
Old 3rd November 2013
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that is correct, the enrichment screw affects idle and off idle and phases out as the throttle is opening. since the carb is vac controlled, the mixture can be all over the place especially if you drilled the port out to the diaphragm chamber. this is a trick mod and often does not work out well and can cause slide oscillations. in reality, the vac signal travels faster in a stock setup than a drilled out one. look at industrial pneumatic control systems and you will see the sensor lines are usually smaller than control lines due to this fact. look at it this way, a new carb is a new starting point and could be less aggravation.
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