Carb/airbox mod issues

J-May · 11-30-2017, 07:04 PM

just received my boom 125cc bike. decided the do the air box mod. involves taking the air box out and removing the inner snorkel and reducer piece. very restrictive to air flow. anyways put it all back together and go for a run and have poor acceleration, i use the choke to richen up the mixture and it gets better. anyways i reinstalled the restrictor in the air box and go for a run no issues.

Is the carb that small??? i mean the restrictor brings 1.5" tubing down to .75" or about the size of a penny. that big of a difference causes a lean condition?
seems quite useless running this tiny carb. anyone else experience these issues? my stock carb only has idle adjustment.

11-30-2017, 07:04 PM	#1
J-May Join Date: Oct 2017 Location: Lacrosse, Wisconsin Posts: 29	Carb/airbox mod issues just received my boom 125cc bike. decided the do the air box mod. involves taking the air box out and removing the inner snorkel and reducer piece. very restrictive to air flow. anyways put it all back together and go for a run and have poor acceleration, i use the choke to richen up the mixture and it gets better. anyways i reinstalled the restrictor in the air box and go for a run no issues. Is the carb that small??? i mean the restrictor brings 1.5" tubing down to .75" or about the size of a penny. that big of a difference causes a lean condition? seems quite useless running this tiny carb. anyone else experience these issues? my stock carb only has idle adjustment.
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