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Title: 300ex carb problems? Post by: craigdieselmac on January 30, 2007, 05:32:08 PM I have a 98 300ex and it does not want to run unless it is choked. I cleaned the carb completly and it is still the same. It runs completley normal choked, but when I take the choke off, it dies. I changed the plug and ran it and it reads rich, which I figure is wierd since it seems to want more gas since it wants to be choked. I checked and double checked the boots and they are all tight and no rips or tears that I can see. The jets did have a little garbage in them when I took the carb apart to clean it, but they were clean when I put them back in and it is still running the same way.
Any help would be appreciated! Thanks Jeff Title: Re: 300ex carb problems? Post by: jmiller450 on January 30, 2007, 05:53:13 PM I would check your valve clearances.
Title: Re: 300ex carb problems? Post by: craigdieselmac on January 30, 2007, 06:58:06 PM I thought of that but I don't know what they are supposed to be.. maybe someone could help me with that as well.
Title: Re: 300ex carb problems? Post by: xr100racer on January 30, 2007, 08:37:19 PM Are they ticking? Listen to the rocker box
Was the bike sitting long, or it was running fine and just started doing this? Title: Re: 300ex carb problems? Post by: jmiller450 on January 30, 2007, 09:20:40 PM if they are too tight(intake side), it will cause a lean condition, it happened with my 450.
Title: Re: 300ex carb problems? Post by: craigdieselmac on January 31, 2007, 06:33:05 AM It just all of a sudden started doing this. It was running fine, then when I rode it again a few weeks later.. it didn't wan't to run unless choked. I've had the carb apart 3 times to clean it since and it hasn't changed a thing.
The valves are ticking a bit, I can hear them, but I'm unsure of what they need to be set at. Title: Re: 300ex carb problems? Post by: TRX450R_Racer on January 31, 2007, 08:47:35 AM How did you clean the carb? Did you take it a part and clean out the main jet? Did you take out the pilot jet and clea the holes out really good with a pick or paper clip?
Title: Re: 300ex carb problems? Post by: craigdieselmac on January 31, 2007, 08:35:47 PM Thanks everyone for the posts.. I adjusted the valves and it seems to be ok now.. thanks to a couple of buds and a few beers. for future reference the valve lash is .004 (.1mm) intake and .006(.15mm) exhaust for 300ex. I'm gonna re-jet too as I am a little rich on top end.. it has a 128, gonna try 126 see where that gets me. Thanks Again
Jeff |