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Old Jun 19, 2012 | 09:42 PM
  #1  
donnieo_71's Avatar
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Weekend Warrior
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Default Exhaust

Hi i'm putting on a fmf fatty on my 1985 250r quadracer. What jet size should i be using?
 
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Old Jun 19, 2012 | 10:31 PM
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Durby's Avatar
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From: Northern CA
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No real easy way to know. If you wanna be sure what Jet size you need you should have your bike Dyno Tuned. Every mod done tho the bike will affect what Jet is needed. Around where I am a Dyno tune is around $100
 
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