Measuring Carb Jets

[Guest]

Sorry if this question has been asked, I did do some searching.

How do you determine jet sizes for BS34SS carbs? I bought a spare set from Ebay and the seller said it was from a 82 or 83 GS1100E. I have a 1980 GS1000G. I suspect according to the carb specs that the jets are different.

So

1. How do you measure carb jet size?

2. Can I use the carbs from the 1100 as is?

Cheers

John

[hampshirehog]

John, the jet size is stamped in to the brass jets in tiny numbers - a magnifying glass is useful if your eyes are like mine.

The carbs may swap over exactly though I'm not sure - do a search for the carb standard spec sticky on here and that will have the jet sizes etc.

[chef1366]

The main air jet on a 16 valve and 8 valve are dfferent. The main jet will not be stock as a result. I'd do plug chops and read the plugs to jet.

[jhillier449]

Thanks for the replies. I am in the process of rebuilding those 1100 carbs now using the rebuild guide from Bikecliff's site and O rings from cycleorings. I will do what chef recommends, the carb you sent was great for learning on by the way. I think I will offer it to anyone who wants it to practice on if they want to pay shipping.

Cheers.

[chef1366]

Thanks for the replies. I am in the process of rebuilding those 1100 carbs now using the rebuild guide from Bikecliff's site and O rings from cycleorings. I will do what chef recommends, the carb you sent was great for learning on by the way. I think I will offer it to anyone who wants it to practice on if they want to pay shipping.

Cheers.

Shoot, I didn't even see who you are.
I'm glad it worked out for you. As I said I never put a carb together with junk parts before.

[jhillier449]

Junk parts or not, it gives you a chance to see how things are put together without causing causing yourself any grief. If you find out its over your head, then you are not left with a disassembled carb and a red face at your local motorcycle repair shop.