Jetting a mikuni 20mm carb

Oh hi there,

I'm anticipating buying a vm mikuni 20 mm carb w/ my next paycheck, and was wondering if anyone had suggestions for jetting sizes for the main jet and idle jet (I live in sf, so whatever that is as far as altitude is concerned).

Oh yeah, and it's going to be paired with the 70cc treat kit on my '77 maxi. Thanks dudes

Re: Jetting a mikuni 20mm carb

Tuning spreadsheet. It's in the wiki.

Re: Jetting a mikuni 20mm carb

Dirty30 Dillon /

For main, somewhere between a 140 and the 180 that comes in the carb.

You'll have to buy the series and tune yourself.

Re: Jetting a mikuni 20mm carb

get the smallest idle jet, and get a few main jets either side of 155. That's the sweet spot for a e50 case matched 70cc Airsal piston port, wire screen filter, and estoril pipe. can't run k&n type filter on piston ports. they spit out too much fuel!

Re: Jetting a mikuni 20mm carb

doesn't VM20 come with a 155?

they are usually real close out of the box on the treat reed kit, in my experience.

Re: Jetting a mikuni 20mm carb

Dirty30 Dillon /

VM20 comes with a 180

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