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Author Topic: Air/fuel mixture (pilot) screw o-ring and washer?  (Read 528 times)

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Offline mr.brandon

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Air/fuel mixture (pilot) screw o-ring and washer?
« on: February 01, 2023, 09:13:16 PM »
I just got done with a head-to-toe carb rebuild and realize that I misplaced the air/fuel mixture screw/jet o-rings and washers... I have no idea where to get Tham or what the part numbers for them are. The o-rings (4) and washers (4) are for a 1974 cb750k model. Any help on where I can find 'em and/or part #'s would be extremely appreciated!!! Thanks
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Offline Deltarider

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Re: Air/fuel mixture (pilot) screw o-ring and washer?
« Reply #1 on: February 02, 2023, 06:17:36 AM »
Maybe your model doesn't have them. Please specify your model (the year is meaningless) and what number is stamped in on your carbs. Then we can help.
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Offline TwoTired

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Re: Air/fuel mixture (pilot) screw o-ring and washer?
« Reply #2 on: February 02, 2023, 06:44:51 AM »
Only the PD style carbs need an o ring and washer.  The earlier carb style air bleed pilot screws only regulate air, so doesn’t matter if they leak a bit.  It does matter on Idle Mixture Screws which regulate mixed air and fuel, which the PD style carbs have.
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Offline Deltarider

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Re: Air/fuel mixture (pilot) screw o-ring and washer?
« Reply #3 on: February 11, 2023, 08:02:38 AM »
Mr. Brandon, congrats, your 657a and -b carbs are the old style carbs and not the PD type, so the airscrews do NOT need a washer and an O-ring.
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Offline ekpent

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Re: Air/fuel mixture (pilot) screw o-ring and washer?
« Reply #4 on: February 11, 2023, 08:39:02 AM »
Thought we went through this already.  :D Post a picture of your carbs. http://forums.sohc4.net/index.php/topic,191838.0.html#lastPost
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