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Float levels in twin carbs need to be the same in both carbs. Other than that ,when you set the needle height, that adjusts the mixture. Main jets are not very important as long as they are a bit rich - so fuel height in the bowls is not critical for those. If you are carburetted rich on the needles, performance suffers. If you are lean on the needles, you should know it by the way the motor misses when you ride the bike. I usually lower the needles until the motor misses, then raise them one notch.With Mikunis, float height is often measured from the gasket face. I don't know about Amals. With Japanese bikes, the manual often says how to set the float height.
Float levels in twin carbs need to be the same in both carbs. Other than that ,when you set the needle height, that adjusts the mixture. Main jets are not very important as long as they are a bit rich - so fuel height in the bowls is not critical for those. If you are carburetted rich on the needles, performance suffers. If you are lean on the needles, you should know it by the way the motor misses when you ride the bike. I usually lower the needles until the motor misses, then raise them one notch.
With Mikunis, float height is often measured from the gasket face. I don't know about Amals. With Japanese bikes, the manual often says how to set the float height.
