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  #1 (permalink)  
Old 09-21-2015, 01:43 PM
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Mikuni 42hsr adjustment

I have a mikuni 42 hrs carb on my revtech crate motor. Before I go messing with adjusting. The bike runs great but the carb will hiccup or sputter every once in a while. What would be the cause of this and how to adjust properly??
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Old 09-21-2015, 05:51 PM
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CHECK FOR An intake leak first
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Old 09-21-2015, 06:21 PM
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If it only does it once in a while , it could possibly be the needle valve getting dirty (ethenol) and allowing the bowl to slightly over fill and choke, then once you ride it will even out..try running some gas treatment through it ..I have to do it, or my needle valve will stick..
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Old 09-22-2015, 09:10 PM
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Great thanks for the info, I'll check for leaks and I did use oxctain boost, will that make any difference?
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Old 09-24-2015, 02:23 PM
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So I checked and made sure everything was tight. Noticed my fuel line was going above petcock before carb, so I fixed that and no more blurbs, seems that fuel wasn't traveling down to carb properly.

Thanks for the info and help
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