What am I missing to make this thing idle?
Hi Tyler:
Here's an idea.......
Chain saws (and other 2 cycle motors) will run at idle but will die with throttle
IF THE MUFFLER SCREEN IS PLUGGED
I'd suggest that you remove the muffler, dismantle it if possible, anc clean it thoroughly. The spark arrestor screen could be completely plugged with oily carbon and the motor cannot run at high speed with exhaust back pressure.
To prove this, you could stuff a potato into the exhaust pipe of your friends motorcycle. Guaranteed you will make him crazy.
Testimonial: "This was the first thing checked and removed."
OK.
You had not mentioned this so I did.
The next thing I'd be checking would be the carb hi and low speed settings.
Since it dies when you set the choke to off, I'd suspect that it is too lean. Try backing the hi speed by 1/2 turn. Start with choke, go to 1/2 choke, then try to increase speed with more throttle. At the same time, tweak the choke off, then back on if it starts to die. Back off the setting and tweak the choke until you can get full throttle and no choke. Then ***** the hi-speed in until RPM peaks, then starts to drop. Back out to full rpm, then 1/3 turn more.
Adjust low speed to get smooth idle with chain not moving.
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What is the make and model.? Is there a 'tick over' idle ***** on the carb.? Usually marked with an (I) does it idle with the chain brake off.? Try increasing the tick over on the carb adjustment
Testimonial: "stihl ms 170"
The MS170 has a preset non adjustable carb, however it does have an idle 5crew located on the right hand side of the carb, have you tried turning this clockwise to increase the tick over revs.?
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