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Old 01-01-2014, 09:45 PM
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rogergendron1 rogergendron1 is offline
Motorized Bicycle Elite Member
Join Date: Sep 2013
Location: woburn ma
Posts: 882
Default Re: what did you do to your motorized bicycle today?

Originally Posted by Greg58 View Post
I did the piston skirt trim on one of my engines, what I did was remove the intake and use a sharpie to mark the piston where it needed to be trimmed. 2 door gave me some tips on what to do, don't remove more than you need to and don't trim the exhaust side. Removing too much will affect the balance of the crankshaft system.
i do this to all my motors !

well about that loss of power and 1/2 throttle bog.... well i drained all the gas and reamed out the main jet to a .74mm and made shure there was no air leaks, then added high oct fuel mixed 50:1 and fired it up and the same problem ! didnt fix it !

just for kiks i swapped back to my old brigs filter and baaaam !!!! bike runs beautiful and will rev till it blows ! speeds up to 40mph !!!

what the heck ? is the sbp 90 deg filter restrictiing air flow and bogging my motor ?
or is it flowing too much air and making me run lean causing the bogging ??

ether way when i put that sbp filter on it bogs down like someone cut off the fuel air once i pass half throtttle !
put the old oversized brigs filter on and wow !!! it ripps now with the new .74mm jet size !!! even more power than before !!!!!

whats up here ? i thought this was supposed to be a performance filter yet my retro fitted brigs and straton air filter makes runs perfect and the sbp filter kills the performance ?

this bugs me as i have been around the block trying to find the problem here

checking for air leaks, rebuilding the carb, rejetting, draining gass, checking fuel flow, cleanning carb out, exe.... only to find out after a quick swap back to my old filter, its the new sbp filter itself thats causing the bogging issue !!!!
here to stay and compleatly insane ! deal with it lol

Last edited by rogergendron1; 01-01-2014 at 09:49 PM.
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