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Post by V90Performance on May 27, 2017 21:16:11 GMT -5
I brought a real 20mm carburetor off of scooters to go. It fixed my starting problem with the starter. My 18mm carb had a 95 main jet. I swapped it to the 20mm but it is running lean since acceleration and top speed has been affected. Should i jump to the 100 main jet? What other tuning advice can you give me about the 20mm carb? Running 50mm BBK with cold air intake and shorty exhaust.
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Post by gsx600racer on May 27, 2017 22:27:35 GMT -5
Give the 100 main jet a shot or go bigger.
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Post by V90Performance on May 27, 2017 22:48:01 GMT -5
Sounds like a plan, il give it a shot.
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Post by dan50 on May 28, 2017 1:59:34 GMT -5
I put a #90 main jet in my 20mm carb for my 47mm BBK build (free-flow air filter and exhaust). It also was running lean. More air means you need more gas, even on a stock engine. A #100 main jet seems about right.
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Post by V90Performance on May 28, 2017 8:37:06 GMT -5
Yeah that logic makes sense. Thanks.
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Post by dan50 on May 29, 2017 0:02:36 GMT -5
I'm not a mechanic, so with carb jetting, it's a lot of trial & error to get it tuned. I thought a #90 would be plenty big, obviously not (stock carb on 50cc engine had #78 and was correct mix).
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