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Old 11-23-2012, 08:25 PM   #1
Join Date: Nov 2012
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Idle mixture screw o-ring

This post seems to describe issues I'm having:

So I don't get what the idle mixture screw o-ring is for. I see the fuel passage going into the screw passage and how screwing the screw in will stop fuel flow into the throttle body. So is the o-ring simply to prevent fuel from leaking out the threads of the screw, or air leaking into the circuit from the screw threads?

It's just that this posting makes the o-ring sound so critical. With so much thread surface it seems very little air could get sucked in.
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Old 11-23-2012, 08:59 PM   #2
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Re: Idle mixture screw o-ring

As the post says, the o-rings prevent air leaking into the circuit from the screw threads.

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Old 02-15-2013, 12:50 PM   #3
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Re: Idle mixture screw o-ring

I measured 0-rings from my VM29SS and they are the same as BST36.

O.D. .200"
I.D. .113"
WIDTH .040"
JET .117"

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Old 02-15-2013, 12:56 PM   #4
Join Date: Jul 2012
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Re: Idle mixture screw o-ring

You could try running it without the o ring and it may work. I wouldn't try it because taking the carbs back off if it doesn't work sucks !
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