gs carb difference engine swap

[homerJ]

ok so il soon be doing a engine swap on my gs chop, whats the difference between the carbs? will it be a straight forward swap? the "new" engine is a 81 n the one currently in my chop is a god knows what (do you know).
heres my chop




heres the "new" engine

[homerJ]

sorry for being such a noob

[Steve]

Your "new" engine is NOT an '81.

It has VM carbs, they ended in '79.

It has a kick starter, they also ended in '79.

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[homerJ]

Your "new" engine is NOT an '81.

It has VM carbs, they ended in '79.

It has a kick starter, they also ended in '79.

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oh right it must of been first registered in 81

[Steve]

That could be, but it does not make it an '81 bike.

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[homerJ]

Your "new" engine is NOT an '81.

It has VM carbs, they ended in '79.

It has a kick starter, they also ended in '79.

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vm carbs, whats vm? whats the other kind?

[cowboyup3371]

Have you been to Basscliff's site and started reading yet? If not, go here...http://members.dslextreme.com/users/bikecliff/ and enjoy ingesting all of the fantastic information you'll find there.

[wedoo2]

I agree. That chop has a bunch of things done that most people cannot, or wouldn't be able to, do. If that is your work, then you obviously have skills. So go off to the info site and learn all you can about Suzukis. Looks like you found the drag pipe I pitched on my current resto. The weld was identical. Keep us informed. One hint, constant velocity carbs.

[Steve]

vm carbs, whats vm? whats the other kind?

VM is the name of the series of carbs that came on the four-cylinder GS bikes up to the '79 model year.

Starting in '80, they went to the BS series, which some call "CV carbs". However, "CV" is a type of carb, not the model name.

They are not directly interchangeable, you will have to keep the carbs that go with the head on the engine.

If you look at the carbs in the pictures, you will see that the VM carbs have a domed rectangular cover that is held on by three screws, the BS carbs have a more-round, flat cover that is held by four screws. Inside, they are TOTALLY different, and they are different sizes, too, which is why you have to keep the carbs with the head, which is sized for the carbs.

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