Quote:
Originally Posted by Weldangrind
Back to measuring: insert various bits into the stock slow jet until you get a sense of which one is a close fit. Measure that bit and then search for one that is one size larger. Continue in that fashion, one step at a time, until the desired size is attained. The reason I prefer Mikuni is that jet sizing is tied to millimetres; a 25 slow jet is 0.25mm, so it's easy to make incremental steps without much fuss. A similar process with a Keihin jet requires a cross-reference chart to convert Mikuni (or millimetres) to Keihin.
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Generally, Mikuni jets are sized by flow rate over hole size and Keihin are all based on hole size. However, not all Mikuni's are strictly flow rate based depending on the jet model. yadda yadda, etc. etc.
Just to keep it entertaining I guess.
In either case, the Hawk pilot is hole size based, so the 40 pilot is .40mm. In order to achieve a "45" pilot, a .45mm hole is needed.
In Micro drill gauge, this would be a 77 (.4547mm) Alternatively, you can buy metric micro bits and get them in .05mm steps .40 .45 .50 etc.