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Last weekend after a jet change my main fell out. Easy fix, but I noticed something. Bike ran great for the five minutes before. Climbing hills better than ever. Anyone ever try to put a small shim on the main jet? I have shimmed the needle, but am not sure if this would work. Looks like enough thread for 1 shim.
 

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I can't imagine what spacing it out would do



I am not sure if the needle makes it down to the main jet or is riding in its own

female part



In either case





I can believe as it backed out that some gas could flow around the looser threads

and richen the mixture
 

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I would have to assume that adding another shim to the needle or going up a size on the main jet would be a better solution than trying to shim a jet.
 

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Discussion Starter #4
I would have to assume that adding another shim to the needle or going up a size on the main jet would be a better solution than trying to shim a jet.
Agreed! But I am running a 125 in the old style. next size up is a 128 too rich. I run good at 75 plus degrees, but lean under that. Just a thought about the shim there. I spray foam, don't know much about any carb other than tw. Going to take all of my old jets 114 to 122 to a machine shop and have them drill the 114s that i have to 126 and 127. Got er dialed in warm weather, but 125 is lean in cold temps and perfect at warmer and 128 has always been too rich. Played with shims a bunch but never got em right. Now is best yet. Lots of playing since i put the big gun on. Added a db dog to quiet it down, but didn't quit make it rich enough.
 

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Would it make a difference if it was deaper in the bowl?


Yeah... deeper... that is all a shim on the jet would do.



You would just be that much closer to any gunk at the bottom of the float bowl.



Changing the float height would accomplish the same thing.



 

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It depends... mostly on the fiber material. As long as fuel would not attack it, maybe OK. But given time & vibration, it may degrade. Stick with metal. m.
 
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