Quote:
Originally Posted by Shafer
When I assembled the carb should I put back the .60mm of shims?
Triple Jim you said they were not needed with a properly running carb. Everyone here speaks of washers under the needles as the magic pill to solve the lean spot.
Thoughts?
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Since I got my carbs back from Ducatiman, they do not need shims, and there is no lean spot. Stock jetting tends to be a little on the rich side, at least the main jets. On long rides without a lot of hot rodding, I get close to 70 mpg. Shimming needles will drop that quickly.
The lean spot develops over time if deposits start forming. Often a buyer of a used 250 will find the needles shimmed and the idle screws way open, in an attempt by the previous owner to make up for partially clogged carbs.