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I have an 88 1500 that hesitates off idle. Honda says the service bulliten work was done although the frame was not marked. I saw a post suggesting raising the idle speed. I went to investigate the speed adjuster and noticed a nipple near the fuel petcock that was open, and I checked with a vacuum gage, was drawing air in.

What is the function of this nipple, and should it be capped? I will cap it and ride it to see if it cures the problem, although nothing could be so easy.

Thanks, Jim
 

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hi jim when you say nipple is it like a brake bleeding nipple iam just wondering if this is off the air filter witch has a small 1 way T peice about 3inches ahead of the petcock it may have got misplaced when some one changed the filter if its drawing air it can make the idle a bit off that could cause the hesation
 

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Sounds to me like the vacuum line for the fuel shutoff valve.

If it is, it goes straight to your right side carb and would be a huge leak causing a large imbalance between the carbs.

Which would give you a really crappy idle at the least.
 
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