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Carb Vacuum Gravity Feed Fuel Petcock

Flogger

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What year did Honda start making the CB750 use vacuum feed vs gravity feed? My 81 CB750C is not where I can check it out. Is there any issue with these pertaining to vacuum and the petcock? In the CX/GL world most fuel issues are cured by converting the cycle to gravity feed and they have a reference section for doing do... The vacuum concept never worked well on those models... Thx
 
Pretty sure they started in '81..................they work fine until the rubber gets hard then problems.

Make sure petcock works well then simply do away with the vacuum valve. Block the vacuum tap off the #2 carb and run fuel line from tank to petcock and then train yourself to always turn the petcock off. That should be in every biker's memory anyway.
 
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