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150cc GY6 and Under Engine Tech GY6 and Smaller Technical Discussion Forum

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  #1  
Old 01-04-2014, 04:37 PM
goldwinger goldwinger is offline
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Default GY6 Carb setting

What is the 150cc GY6 normal carb setting
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Old 01-04-2014, 07:20 PM
351mustanger 351mustanger is offline
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What do you want to know? Jet sizes? Fuel mixture screw? Float height?
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Old 01-04-2014, 07:47 PM
goldwinger goldwinger is offline
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it's a stock carb and just need to know the setting on the lower driver side screw setting not the idle screw
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Old 01-04-2014, 07:57 PM
351mustanger 351mustanger is offline
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I think the stock setting is about 2-1/4 turns out from lightly seated, but you should set it at the point the engine likes (in or out from 2-1/4 to get the highest rpm). The float height should be the first thing you check though. Stock height is 18-19mm.

I just checked my original carburetor specs. Stock settings on 2012 Trailmaster 150xrs: air/fuel screw 1-1/4 turns out (The manual says to turn the screw in gently until it stops, then back it out 2-3/8 turns. Then turn it in counter clockwise to achieve the highest rpm. Idle rpm =1400). Pilot jet =35. Main jet =111. Float height =18mm.

Like stated on the other forum, check the auto choke for proper operation.

Last edited by 351mustanger; 01-04-2014 at 08:50 PM.
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