Help please

[BGATZ]

quad idles fine when i go to ride it studders or the throttle is fluttering starts i mid range and cant reach power ban tommey pipe 310 main kn filter vrofce 1 mil over i feel like i need to jet up higher it got cold



i feel like i need to jet up also what are stock mixture settings

 

[Awk08]

have you.......
tried a new plug ?
cleaned the carb and filter ?
checked the reeds for cracks/chips/broken petal ?
good fuel/oil mix ?
leakdown tested it ?
compression tested it ?

check/set the floats.......
http://www.blasterforum.com/carburetor-138/float-heights-how-adjust-them-50565/

adjust your airscrew to acheive highest idle.......
http://www.blasterforum.com/carburetor-138/adjusting-your-airscrew-pilot-jet-51060/

raise your needle, by lowering the clip, until it "rich bogs" then back down until it pulls hard

then plug chop for the new temps.........
http://www.blasterforum.com/do-yourself-20/how-plug-chop-38674/

 

[BGATZ]

brand new plug
cleaned carb and filter all tests done i think i need to rejet
already running 310 idles fine and low end perfect but no high or mid

 

[Awk08]

i'd buy the next 3 sizes up, start large working down, doing plug chops along the way

 

[BGATZ]

seems like the plug i am putting in is getting black quick if i had to judge 320,330,340
where can i find them for a good price and what about the mixture screw

 

[BGATZ]

only time i ever rejetted was couple years ago within past 2 monthes i did port nd polish bigger piston and kn filter and i live in ct and its starting to get cold

 

[Awk08]

adjust that airscrew as desbribed above, and jump that main at least 2 sizes plug chop and see what happens

 

[BGATZ]

2 sizes up as in 330 not 290 i have a 290 in garage but 310 in quad now
would all these mods cause it to need more air

 

[Awk08]

yes...2 sizes up to a 330 to richen the air/fuel mix
290 is down and leaner.
yes again...the porting will have it breathing better

 

[slickerthanyou]

Air leak test it also! didn't u just have a base gasket put on?

 

[BGATZ]

I did. Gonna call him Monday. It's bullshit. He wasn't home when I picked it up so I couldn't talk to him. He races on weekends. Going to get jets 320 330 340 tomorrow. I will leak test and try the 330 first as awk said