Carb differences

[Guest]

Can someone more familiar explain the general dofferences between the 550 / 650 /750 and 850 CV carb sets? I’m. Assuming the bores are different diameters along with the necessary key differences?

can I use 850 carbs on a 750 ? Or vise versa?
any common internal parts?

I have a set of 650 carbs but I have three 750 bikes. Any reason to hang onto the 650 set ?

[Steve]

The biggest difference is in the jetting. Assuming they are all 1980+, they will be CV-type carbs and will all be BS32SS, except for the '83-and-newer 550s.

There were detail differences in the transition ports and main air jet sizing. The 550 and 650 carbs have different spacing between carbs 2&3. It's not just changing the fuel "T", it also affects the "choke" actuator rod and the throttle shaft length on carb #2.

Individual carb bodies can be transferred from the 650 carbs to the 750 carbs, but the rack as a whole will not be the same.

What is the condition of the 650 carbs? I might be interested in them.

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[Ntolerance]

Steve. Thanks for the info. These carbs are complete but not very visually appealing. I havent opened them up yet. They would clean up for a rider but are far from show quality finish. Tops have corrosion and what looks like clean coat peel?

theyve been outside for some time or in a damp garage.

[Steve]

Let me know if you want them to look more like this:



The insides will be just as clean, too.

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