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Post by lain on Oct 29, 2015 12:39:15 GMT -5
So I am using a 24mm carb on my big valve 50mm bbk setup. I want to use a #  main jet but the only one I have is from a keihin 18mm carb. Can I use the main jet from the smaller carb or do larger carbs use larger threads? |
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Post by JerryScript on Oct 29, 2015 17:31:38 GMT -5
Simple way to find out! (Wink)
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Post by lain on Nov 1, 2015 13:04:26 GMT -5
So I found out the answer, it is no. The larger 24mm carburetors seem to take .8mm threads while the smaller carburetors use .7mm threads.
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Post by tvnacman on Nov 1, 2015 15:02:38 GMT -5
how are you measuring? I have jets from like 80 to 145.
John
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Post by lain on Nov 1, 2015 15:07:48 GMT -5
how are you measuring? I have jets from like 80 to 145. John I emailed the guy I ordered both carbs from and he let me know the threads were different sizes. I also tried and it didn't seem to fit right after the first like quarter turn of screwing it in. I will be needing a # jet for 24mm carburetor (150cc carb) but can't find it without having to buy an entire kit of jets and I already know it was running slightly rich with the 100 jet on my 50mm bbk. |
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Post by tvnacman on Nov 1, 2015 15:55:59 GMT -5
your running a 24mm carb on a qmb? I take its not a pumper.
show me how your measuring it.
John
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main jet but the only one I have is from a keihin 18mm carb. Can I use the main jet from the smaller carb or do larger carbs use larger threads?
