Extremely High Idle on Yamaha 1997 DT 175 After Carb Clean
Hello all! I am fairly new to the world of motorcycles. Although Im not completely new to mechanics. I have spent a lot of time on Trucks, Tractors and ATV's.
I have a Yamaha 1997 DT 175 that I am working on as a hobby. Its a pretty old machine, but most of the parts seem to be in good order. After a battery change and fueled it up, I got it running. I also changed the transmission oil. It was a pretty good idle with the choke out, but it was weak or would die when I pushed in the choke If I didn't give it any throttle. After some research, I thought maybe the problem could be solved by taking out the carburetor and cleaning it. After reinstalling the carb, the motorcycle wants to fly, literally. After kickstarting it, It immediately revs up to 7-8000 RPM's. I cant turn on the motorcycle for more than a few seconds before it redlines. Obviously, I shut it off at that point. I don't want to damage anything. If you push in the choke, The RPMs go even higher.
After more research, I thought it might be a air leak. I replaced the hose clamps and re-adjusted the hoses. I have also adjusted the idle screw and air/fuel screw and still no cigar. I haven't messed with the throttle wires or anything throttle related at all.
Any help at all is greatly helpful! Thanks.
I have a Yamaha 1997 DT 175 that I am working on as a hobby. Its a pretty old machine, but most of the parts seem to be in good order. After a battery change and fueled it up, I got it running. I also changed the transmission oil. It was a pretty good idle with the choke out, but it was weak or would die when I pushed in the choke If I didn't give it any throttle. After some research, I thought maybe the problem could be solved by taking out the carburetor and cleaning it. After reinstalling the carb, the motorcycle wants to fly, literally. After kickstarting it, It immediately revs up to 7-8000 RPM's. I cant turn on the motorcycle for more than a few seconds before it redlines. Obviously, I shut it off at that point. I don't want to damage anything. If you push in the choke, The RPMs go even higher.
After more research, I thought it might be a air leak. I replaced the hose clamps and re-adjusted the hoses. I have also adjusted the idle screw and air/fuel screw and still no cigar. I haven't messed with the throttle wires or anything throttle related at all.
Any help at all is greatly helpful! Thanks.
1 - 7 of 7 Posts
Sounds like a very easy fix. Most likely the throttle slide that the throttle cable attaches to at the top of the carb is not correctly installed there is a slot on the carb slide and a fixed pin in the carb they must be aligned to verify just pull the carb and look to see if the slide is all the way down or up leave the throttle cable connected don't unscrew the top until you have verified the slide is all the way down common mistake.
Sounds like a very easy fix. Most likely the throttle slide that the throttle cable attaches to at the top of the carb is not correctly installed there is a slot on the carb slide and a fixed pin in the carb they must be aligned to verify just pull the carb and look to see if the slide is all the way down or up leave the throttle cable connected don't unscrew the top until you have verified the slide is all the way down common mistake.
Thank you! I try this out and post how it works.
Sounds like a very easy fix. Most likely the throttle slide that the throttle cable attaches to at the top of the carb is not correctly installed there is a slot on the carb slide and a fixed pin in the carb they must be aligned to verify just pull the carb and look to see if the slide is all the way down or up leave the throttle cable connected don't unscrew the top until you have verified the slide is all the way down common mistake.
That was it Bill! Thanks a ton! When the brass slide was replaced, I accidentally put it in 180 degrees the wrong way.
Now I seem to have an issue keeping the motor on again
If you have any tips, here are the details:
When the bike is kickstarted, it goes up to 2000 RPM and slowly creeps down to 1000 and under then dies. We have adjusted all of the idle/Air/Gas screws on the carb and having an issue. Itll stay on for maybe 10 seconds, but then looses all of its gusto.
Make Shure the slack in the throttle cable isn't too loose and check for vacuum leaks could be crank seals very common on the older Yamaha enduros.
Make Shure the slack in the throttle cable isn't too loose and check for vacuum leaks could be crank seals very common on the older Yamaha enduros.
You know, we just started to look into the throttle cables yesterday. They seem to be too loose and it appears they've already been tightened all the way. We are planning on changing them out and going from there.
Thanks so much for your help! Ill keep you updated.
1 - 7 of 7 Posts
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