Carburetor Vacuum and petcock

[ptakattack]

I recently bought a set of rebuilt VM26 carburetors (originally from a Kawasaki KZ1000) off ebay for my 78 GS750. I bolted them on the bike and she started right up. I know that i am going to have to change the jets on them but the only other problem with them is that there is no vacuum port on it that is suppose to go to the fuel petcock. It runs with the petcock on pre but i read that it is not good to run the bike on that. Could anyone tell me if it's ok to leave it on pre or if there is another spot that you can hook the vacuum on the fuel petcock too? (if it will help i can post pictures of the carburetors)

Thanks,

Mike

[SqDancerLynn1]

It may be on one of the other carbs. If their is no vacuum you could tap into the intake manifold (carb balancing port) Or for that matter drill & tap a fitting into the carb intake boot. You can run it on prime, just don't forget to turn it to ON when you park. Be aware you will not have reserve if you run it on prime.

[GSJim69]

I have read on here that there is less fuel flow through the prime position. So, you might run into problems when you are running at speed for a bit.

[BassCliff]

Greetings and Salutations!!

Hi Mr. ptakattack,

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