Will CB750 carbs fit on a 79 CB650?

edelweiss

edelweiss

Coast to Coast
Will CB750 carbs fit on a 79 CB650? If so, will 750 carbs eliminate the whole pain of trying to sync the 650's CV carbs?
 
the spacing is not the same so they wont bolt up as far as i know

here is how i fixed mine

 
cxman said:
the spacing is not the same so they wont bolt up as far as i know

here is how i fixed mine

Click to expand...

I see the pieces you have on there. Very cool. Dumb question, couldn't a longer more flexible tubes be used?

Also:
1. Once the 750 carbs are on there, does that basically eliminate the nightmare of the trying to sync the stock 650 vacuum carbs?
2. I imagine syncing the 750s is much like syncing the carbs on a 72 CB500?

Thanks!
 
those are not 750 carbs they are mikunis and there is only 2

the 750 carbs wont eliminate syncing and i dont know why syncing the 650 carbs are any worse than others

no diff for me if the carbs are clean
 
IIRC, the early cb750 carbs are spaced the same as pre-CVcarb cb650's.....a user on sohc4 forums named "paulages" has been running early cb750 carbs on his big-bore cb650-based hybrid motor for 2 or 3 yrs now. It's a 1979 cb650 motor with the cases bored for cb750 liners, then an 836cc kit inside it to make a 741cc cb650 motor....running stacks and bigger jets in pre-'75 cb750 carbs.

I happen to have the same carbs and a 1980 cb650 motor at the shop, I'll put the two next to each other and let you know if they'll fit tonight.
 
i have a set of early cb 750 sohc carbs and a set of cb650 sohc(1981 ) carbs in my hands and the 750 sohc carbs are about 1/4

of an inch wider spacing
 
focusinprogress said:
IIRC, the early cb750 carbs are spaced the same as pre-CVcarb cb650's.....a user on sohc4 forums named "paulages" has been running early cb750 carbs on his big-bore cb650-based hybrid motor for 2 or 3 yrs now. It's a 1979 cb650 motor with the cases bored for cb750 liners, then an 836cc kit inside it to make a 741cc cb650 motor....running stacks and bigger jets in pre-'75 cb750 carbs.

I happen to have the same carbs and a 1980 cb650 motor at the shop, I'll put the two next to each other and let you know if they'll fit tonight.
Click to expand...
I'm digging up the archives here -- I've heard of this but isn't this person using a 750 head with the 650 casings?
 
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