I was wondering is you guys could help me out.I know this is a fourwheeler forum but could you please help me with my son's 2-wheeler. I bought a 94 KTM 50 motorcyle. It had been sitting for about 2 years. It's a 2-stroke. I can get it started with the choke on and it will run as long as I keep the RPM's up with the choke off. But throttle response is very boggie, and it will not idle at all with the choke on or off. The carb has been cleaned and we did clean the little orifices in it also. the plug seems to have good spark, but I'm lost. Please help me. thanks in advance.

 

You are probably going to have to tear the carb apart again. It really sounds like plugged jets. After 2 years or so the gas starts to smell like turpentine and gums up the carb. You need to soak the components in some good, fresh carb cleaner. Try your local automotive repair shop. After rinsing, use high pressure air to clean all air passages.
Mark

 

westport,
Are you sure you have an idle adj. on the carb? Some 2 strokes are not designed to idle. If you do, in fact, have an idle adj screw make sure it isn't turned too far out

[This message has been edited by hot_shoe_cv (edited 12-16-1999).]

 

A lot of times on a carb that has sat with gas in it for so long will plug up the jets so that even carb cleaner will not break it up. You should be able to see daylight through the jet if it is clean. Soak the only the jets for 4-5 hours and then use a very SMALL piece of stiff wire (I usually use something like a piece of wire cut off of my wire brush wheel on my bench grinder) to "bore" your way through the crud in the jet. Be very careful to not oversize the jet.Once you've gotten a hole through, they usually clean up pretty well. If the jets are in too bad of shape you may end up replacing them anyways. A can of spray carb cleaner is a good tool to flush the jets and the passages in the carb once you have "cleaned" it.

 

thanks for the input. we took the carb. apart and cleaned it again. must have missed something the first time as now it idles and runs great. thanks again.