Thack82 Posted April 29, 2011 Report Share Posted April 29, 2011 (edited) Quick question..... What Keihin jets sizes are equivalent to the following Mikuni Jets? Main Jet: 340 Pilot Jet: #30 If you guys could answer this question It would help me out alot. I've got a general Idea from some of the BHQ Members on where to start my jetting on my new Carbs (Twin 28mm Keihins). They recommended I start with a 50 Pilot and a 155 Main. I hate to mess with the jetting I have, I used a Vito's Stage 3 Jet Kit and the jetting is dead on. I think I can get closer to the exact jetting I need for my set up if I can find out what the Keihin equivalent Jets are to the Mikuni jets I have. I figured that I would have to step up one size bigger on both jets to make up for the increased fuel/air mix that I will be getting from the Keihins. You experts comment and help me out as soon as possible. My twin 28mm Keihins are supposed to be delivered by the end of the day today and I want to stop by Derby Cycle and put together a jet kit so I will have it and have it going before I get in the bed tonight. Thank You, Jim Edited April 29, 2011 by Thack82 Quote Link to comment Share on other sites More sharing options...
Coupelx Posted April 29, 2011 Report Share Posted April 29, 2011 they do not cross over very well. you could measure the size of the orifice and that would give you the keihin jet size but thats not necessarily the one you will need. mikunis jet very differently than a keihin carb also. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted April 30, 2011 Report Share Posted April 30, 2011 48 pilot,155 main is safe, i think you might end up 150ish but better safe then sorry Quote Link to comment Share on other sites More sharing options...
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