1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

tuning a mikuni

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Old Feb 23, 2003 | 08:55 AM
  #1  
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From: seabrook
Thumbs up tuning a mikuni

Just wondering if anyone knows how to adjust a mikuni carb to get the most out of it. I just put a side draft 44phh on my rex and I want to make sure I get the most out of it. Any help is appreciated
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Old Feb 24, 2003 | 05:39 PM
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From: Ventura, Ca
Jetting it! The main jets, pilot jets, air correction jets, are all located under the top cover on the carb that is held on with the single screw.

I recommend finding a chassis dyno to get it tuned on, if not just do full throttle runs and pull the plugs (that how i did it).

here are a few links of dealers for jets:
www.toysport.com
http://www.motorcyclecarbs.com/mikuni/mik_tuning.htm
good deal on 4 pack main jets


and here are the part numbers:
Main Jet: N100.604
Pilot Jet: N101.043
Air Jet: B42/56 or B42/55

matt
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