300 ex problem

[Rockguy]

It's a 93. I just replaced the gas tank. I got a stock one from Ebay. It looks great inside. The quad had been sitting for probably 3 years. I took the bottom of the carb apart and it looks great. Nice and clean. I'm having trouble keeping it running. It will start and run for 5 to 10 seconds then shut down like it's out of gas. I checked with the fuel valve in all positions. I then let it sit for a few minutes and, I can repeat the process. It will start run briefly, then shut down. If I try to restart immediately, it won't start. I have to let it sit for a few minutes.

I was thinking maybe the valve wasn't letting the fuel out quick enough. Maybe that's why I have to let it sit til it builds fuel in the bottom. I took it off and took the bottom screw out. It looks all nice and clean too. I opened the valve and tipped the tank and, some gas would come out. I'm not sure how quickly it should pour out. I put it back on and tried again. Same deal. I cleaned the spark plug. I shot plenty of gumout in the butterfly at first. Had trouble getting it started for awhile (probably cause it sat so long)

I can't think of what I should try next. Any ideas? Like I say, it's really acting like it runs out of gas but, I guess there could be some other problem.

[2002ramguy]

I had the same problem with my 93 ex. i took the carb off, took it apart and a small valve close to the middle of it. i cant remember if it was a small needle or screw in it but anyway i took that out of the valve blew out the the valve with an air hose put it all back together. It took it a few minutes to crank up but when it did it ran beautifully. You could try that and see how it does. (the valve was clogged with trash in mine)

[Rockguy]

Thanks very much ramguy. I think you are onto something here. I will give that a try

[2002ramguy]

No problem. Just wondering if you have tried it yet and how it turned out for you.

[Rockguy]

Originally posted by 2002ramguy
No problem. Just wondering if you have tried it yet and how it turned out for you.

Hey ramguy, no, I haven't had the time to get back to it yet. I'd like to real soon though. I'll come back and let you know how it worked out.

[fmftrx300ex]

when u clean a carb its important to clean everything not just the bowlu need to clean the jets and everything , and also check you have a good vent ontop of your fuel tank if its logged it will cause fuel to flow slowly

[Rockguy]

I tried the carb again with the same results. I have decided to order a rebuild kit from Honda. It should be here in a few days. I noticed a little gas leak on bottom anyway. Probably from disturbing the old o rings. This way I will get new o rings, jets, and whatever else they put in those kits.

[2002ramguy]

Hey dude sorry the carb cleaning didn't work for you. When i did it to mine it turned out great. i just thought that it might would have worked for you to. Have you gotten your rebuild kit it yet. Good luck with it.

[fmftrx300ex]

You could have a bad float or float valve

[Rockguy]

I've rebuilt the carb and it now keeps running. The only problem remaining now is that I can't control the idle. It revs up pretty high without touching the throttle at all. The idle screw has no affect on it. I'm baffled. I took a look in the linkage area to make sure I didn't have something messed up and it all looks good.

[Rockguy]

I took the linkage out and put it back in and it's working fine now. I'm not sure what the deal was but, that was it.