Bogging with airbox attached

Boots · Post by **Boots** » Wed Apr 13, 2016 12:00 am

i have a Buddy 125 w/ Prima exhaust that was sitting for approx 1 year.

completely disassembled carb, cleaned and blew out all journals - everything passes air.

reassembled and installed carb. fires up and idles fine. with the airbox off it will rev but in higher RPMs sounds like it's misfiring.

as soon as i attach the stock airbox it will no longer rev but bog out. it will still idle fine.

it has the orange 'performance' coil and plug wire on it. (i find the only difference between these and stock GY6 coils is they're orange - the stock Buddy one is probably waaay better anyway)

i've had this same problem in the past with another 125 - went through the carb several times and just could get any love. finally i bunged on a new carb and it worked perfectly.

are these carbs just too finicky? once they go it's just all over with?

thanks!

dasscooter · Post by **dasscooter** » Wed Apr 13, 2016 2:10 am

Pull the CV boot out and wipe grease around the edge so it gets held in while you put the cover back on. Should be fine after that

Boots · Post by **Boots** » Thu Apr 14, 2016 6:44 pm

i've done that and got no result. i've even put in a new slide/boot and still nothing.

thanks!

viney266 · Post by **viney266** » Sun Apr 17, 2016 11:16 pm

Did you change jetting for the prima before the bike sat? Or is this a new pipe you just added? ie jetting is off?

Boots · Post by **Boots** » Fri Apr 22, 2016 6:27 pm

the scooter had the exhaust on it already. the main jet in the carb says "K92" what should it be with the prima exhaust? what is stock?

thanks!

babblefish · Post by **babblefish** » Mon Apr 25, 2016 10:23 pm

I believe the stock MJ should be a #102. You're running a #92, the same as what I had in my 150 (which also should have been a #102). My engine was very lethargic and ran hot. I'm currently running a #118, but my engine is no longer stock. You have a presumably freer flowing exhaust, so your engine is probably running really lean now which gets worst at greater throttle openings. I'd start with a #102-105 MJ then check sparkplug color to fine tune the size.

My guess as to why the installed MJ in my scooter was smaller than PGO intended is in order to pass CA emissions laws.