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BKo
03-25-2008, 12:27 PM
so i think my quad might be blown up or mabye the head gaskets leaking it runs great for a couple min. but then it starts runing bad when you get on it. but will start up good and ideal good any ideas would help thanks
UNBROKEN
03-25-2008, 12:44 PM
can u decribe the problem please and is the headgasket leaking or not? sounds like its time to clean the carb and airfilter change plug the minor tuneup things, and go from there if not fixed
BKo
03-25-2008, 01:26 PM
ive did all that and i always think its fixed because it will run good for a couple times up and down the drive way then i will get my hemlent to ride it then i get on it and it will just pop and run bad then shift and it will do it in the next gear i can slowly get on it then it wont do it as bad could it be electrical
my88r
03-25-2008, 01:30 PM
whats your plug look like after this.

maybe cdi or coil.
BKo
03-25-2008, 01:34 PM
yea i think im going to chang them out because i got awhole nother quad for parts so im going to try that i need to pull the plug out ran out of time at school right now but the thing that gets me is it only does it when its warm
my88r
03-25-2008, 01:43 PM
when it does that at running temp. you know its the ignition coil. possible cdi. sometimes a improperly gaped plug.:)
BKo
03-25-2008, 01:46 PM
thanks i figured it would do it the whole time with something like that i will change them out and keep posted thanks for the help
BKo
03-27-2008, 01:49 PM
well i had the air box lid off when i was changing the coil outbecause i have a aftermarket airbox with my battery in it i throw my seat on and took of ran great. so i changed the oil and put it back to gether and took of ran bad again so i took the air box lid of and ran good so it was jetting the whole time does this mean my quad is rich or lean
07trx400ex
03-27-2008, 02:01 PM
Since you took the air box off and it ran fine, then it mush have been rich.
BKo
03-27-2008, 02:52 PM
now is that the jets or could i adjust the air/fuel screw
07trx400ex
03-27-2008, 03:00 PM
Read this:http://www.powroll.com/tech_specs_jetting.htm
and:
http://www.powroll.com/tech_specs_jetting101.htm

but then it starts runing bad when you get on it. but will start up good


Pilot Jet = 0 to 1/4 throttle. Needle = 1/4 to 3/4 throttle. Main Jet = 3/4 to Full Throttle.

Your pilot is probably fine, but the needle and main need adjusting.

I knew all about the concepts of jetting, but had no idea how to actually do it. The "How to Disassemble a Carb" article helped me the most.