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quad runs bad when warm
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Posted by: BKo

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

Posted by: UNBROKEN

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

Posted by: BKo

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

Posted by: my88r

whats your plug look like after this.

maybe cdi or coil.

Posted by: BKo

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

Posted by: my88r

when it does that at running temp. you know its the ignition coil. possible cdi. sometimes a improperly gaped plug.

Posted by: BKo

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

Posted by: BKo

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

Posted by: 07trx400ex

Since you took the air box off and it ran fine, then it mush have been rich.

Posted by: BKo

now is that the jets or could i adjust the air/fuel screw

Posted by: 07trx400ex

Read this:http://www.powroll.com/tech_specs_jetting.htm
and:
http://www.powroll.com/tech_specs_jetting101.htm

quote:
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.