carb. problem please help.

[inlinepwr]

anyone have any ideas what would cause my moter to serge and backfire through the carb. i rejetted the other day and it is much worse. i put a #40 pilot, #155 main and it is 2 1/2 turns out not sure about the clip. it runs strong on the top end but the bottom is the problem and i'm lost. thanks

[Sanddraging28]

have you messed with the cam or the timing....i haven't seen one backfire thru the carb in a while...also what is done to your bike. that will help on suggesting jet's

[inlinepwr]

i got the bike two weeks ago so i don't know much about it. i'm the second owner and the only thing i was told was that the k&n and the exhaust were changed so i would think the timing and cam are stock. when i changed the jetts i notested that the plastic clip that clips to the bottom of the main jet was bent?? the fuel screw was turned out 3 1/2 turns and the idle screw was turned up too high. he told me that it haddent been used for a year and a half. hope this helps:confused:
also while decceleration? in gear when i down it occasionally stalls? thanks

[inlinepwr]

anyone have any ideas I'm lost. tomorrow I'm going to pick up a carb rebuild kit hope this helps. is their anything else to check??

[Sanddraging28]

that could be the problem. if that carb sat for a year and a half with gas in it, there is a good chance the carb is all gummed up.

[inlinepwr]

i cleaned the carb. everything looked pretty clean and still have the same problem. idle through 1/8 throttle is where the prob. is 1/8+ through wot seem good. could it be getting too much fuel down low?? my settings are at sea level. #40 pilot #155 main 3rd clip from the top 2 1/2 turns out.

[Homerx]

With the bike idleing spay carb cleaner around the carb and boots to see if it has an air leak causing leaness. If it has a leak the rpm will increase from the spray. Also check gas cap vent and all carb vent lines. GL

[inlinepwr]

how can i check the carb vents?? i blew them out when i cleaned it and they seemed ok.

[ricks450]

What jet did u have n it at first? Before u changed to a 40 and what was ur main jet to?

[inlinepwr]

#38 pilot #148 main 3 1/2 turns out 3rd. clip from the top and the idle was turned up

[ricks450]

How did the bike run on that? Sorry to ask the first time.

[inlinepwr]

it had the same problems but after i jetted it they got much worse.

[ricks450]

Originally posted by inlinepwr
it had the same problems but after i jetted it they got much worse.

what kind of jets r u runig? if u r sure u cleaned the carb real good then go higher in the jets and see what it does. it sounds to me u r running way to lean.

[ricks450]

I just put a 48s kehin jet in my dads bike its rich but fires right up and u don t even need to choke it and a 185 main. His bike was doing the same thing. thats why i started that hi. but it runs good on it. the 48s was my stock 05 450r jet. but u can get anything u want at jetsrus.com

[05strokinfx4]

i had this problem on my 08 but i let it sit for about 2 months with out draining the fuel(amateur) and they told me that the ethanol in the gas is gumming up the jets. but if you cleaned it good it should be fine. only thing i didnt see mentioned was the floats but i dont know if this will make it do what your saying. make sure to drain you carb of fuel if it is going to sit for more than 2 or 3 weeks.

[inlinepwr]

i got the jets from the dealer. when i cleaned the carb i completely disassembled it float needle included didn't see anything wrong, i guess i will play around with the jets. does anyone know what in included with a carb rebuild kit all i got was gaskets and o-rings doesn't seem correct??