1985 Tri-Moto 200 rough idle and dies
Pulled it out of the chicken shed after 20 years. Took the carb off and used a complete can of cleaner and have it looking real good. Started on the third pull. But it has a hard time idling. Replaced the spark plug and changed the oil and oil filter. Have the air/fuel screw two full turns out. If I set the idle screw with it idling a little high, it will keep running. If I just turn the idle screw down 1/8 of a turn, it will idle down and eventually die. Any ideas on that? Also, when idling low it will seem to miss and make a hard clunk noise in the engine. Any suggestions? I have a video of it idling, but not sure I can upload.
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Did you pull the jets out and clean them out real good? It could still be not getting enough fuel, causing the low idle. The clunk is probably the one-way starter clutch, it probably needs replacing but it's not a big deal, especially if you don't use the electric starter.
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I just pulled the carb again and checked it all over and cleaned everything again. I also just check the timing and it is all lined up as it should be. Any other ideas?
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Due to its age, the o-rings inside the carb are probably stiff, dry-rotted, and cracked, allowing internal air and / or fuel leaks. Replacing all the soft parts (o-rings, gaskets, and inlet & seat) will get everything sealed up again.
Bike Bandit or Yamaha Parts House are a couple of good sources for individual parts I've been through this a few times with my old quad and bikes. I'm a connoisseur of fine old junk. :D |
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