Post by shityscootermechanic on Aug 20, 2015 8:04:29 GMT -5
Hello everyone this is my first post. I was hoping to get some opinions on some problems I'm having perfecting my scooter since installing a 100cc (83cc) BBK on my 139qmb GY6 scooter.
These are the mods I have done so far:
-100cc BBK (includes
jet and 8g roller weights)
-high flow open air filter
-92 size main jet
-8g roller weights
-Aftermarket performance CDI and ignition coil
-high flow fuel filter
Originally when I installed the BBK I was getting rich running conditions with the stock air filter. So I installed an open cone air filter. This helped a lot but actually caused the bike to be running lean. On my first ride I could get up to about 30mph easily and actually pretty quick before the engine would start surging. Sounded to me like I was leaning out at the higher rpm. So I up jetted the carb to 92 (from), installed the performance CDI and coil, and the 8g roller weights, and the high flow fuel filter. This helped alot, I can now get up to about 35-38mph before the surging problem starts again. So now I am stumped, I'm not sure where to go from here.
So I am just hoping that someone could give me some suggestions to fix this problem. I plan on tweaking the carb a little more. I want to up jet to 100 and experiment with the float needle height. I bore out the stock exhaust by drilling four 3/8" holes but I definitely plan on installing an aftermarket performance exhaust as well.
If anyone has any suggestions or could help I would appreciate it!!
BTW I know it says I am a new rider, but I have had this bike since 2008 and I never had any problems with anything. I just needed a summer project. So I am an experienced rider, but a completely inexperienced mechanic.
Ride On!!
These are the mods I have done so far:
-100cc BBK (includes
jet and 8g roller weights)-high flow open air filter
-92 size main jet
-8g roller weights
-Aftermarket performance CDI and ignition coil
-high flow fuel filter
Originally when I installed the BBK I was getting rich running conditions with the stock air filter. So I installed an open cone air filter. This helped a lot but actually caused the bike to be running lean. On my first ride I could get up to about 30mph easily and actually pretty quick before the engine would start surging. Sounded to me like I was leaning out at the higher rpm. So I up jetted the carb to 92 (from
), installed the performance CDI and coil, and the 8g roller weights, and the high flow fuel filter. This helped alot, I can now get up to about 35-38mph before the surging problem starts again. So now I am stumped, I'm not sure where to go from here. So I am just hoping that someone could give me some suggestions to fix this problem. I plan on tweaking the carb a little more. I want to up jet to 100 and experiment with the float needle height. I bore out the stock exhaust by drilling four 3/8" holes but I definitely plan on installing an aftermarket performance exhaust as well.
If anyone has any suggestions or could help I would appreciate it!!
BTW I know it says I am a new rider, but I have had this bike since 2008 and I never had any problems with anything. I just needed a summer project. So I am an experienced rider, but a completely inexperienced mechanic.
Ride On!!
