How can i lower idle speed?
- Thread starter jmaack
- Start date
Brianator
Gettin' er done!
Which screw? On the main throttle control or on the carb itself? The one on the throttle control is the "governed speed adjustment", the one on the carb (black plastic screw) is the "true" idle adjustment.
If you're still stuck try adjusting the fuel/air mixture screw, if it's set a little lean you'll get a high idle. About a 1mm crack of the throttle being open and 1-1/2 turns out (from lightly seated) of the mixture screw is a good starting point.
Also make sure your mounting gasket and carb insulator "plate" are oriented correctly, if it's not you can have a vacuum leak (essentially).
As a quick test what happens when you close the choke while the motor is running?
If you're still stuck try adjusting the fuel/air mixture screw, if it's set a little lean you'll get a high idle. About a 1mm crack of the throttle being open and 1-1/2 turns out (from lightly seated) of the mixture screw is a good starting point.
Also make sure your mounting gasket and carb insulator "plate" are oriented correctly, if it's not you can have a vacuum leak (essentially).
As a quick test what happens when you close the choke while the motor is running?
I adjusted the idle adjustment black plastic screw all the way out.
mckutzy
Well-known member
What mods or upgrades to the engine are installed?
Is the throttle pulling the throttle arm a little? this will cause higher idle.
Pics of throttle setup?
Is the throttle pulling the throttle arm a little? this will cause higher idle.
Pics of throttle setup?
Stage 1. I tried disconnecting the throttle and no change. I belive something is slightly off adjustment. I can barely press the arm a bit and it idles perfectly.
It wants to creep on me when running now. At idle the tq converter is slightly engaging. When i manually press arm i can watch the clutch retract,
Brianator
Gettin' er done!
Open up the fuel/air mixture screw a tad and I'd bet the idle drops....
I would if i could but i got the janky non adjustable carb.
Brianator
Gettin' er done!
That's bunk! First thing I do if I get a motor with one is order an adjustable one off Amazon! 
Do you still have the governor hooked up? If so stretch that idle return spring to a further hole on the governor arm or drill a new one. If not add a light return spring, you mentioned you can get it to drop by hand.
Do you still have the governor hooked up? If so stretch that idle return spring to a further hole on the governor arm or drill a new one. If not add a light return spring, you mentioned you can get it to drop by hand.
I await pics of this carb before I can comment
TheInspiredFool
Member
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It could be an intake leak leaning the engine out a bit. That will cause rpm to rise at idle.
pics of what? it is a stock predator 212 carb.
---------- Post added at 05:37 AM ---------- Previous post was at 05:37 AM ----------
checked first as I thought the filter adapter wasn't seated correctly.
Because people do things to their carbs and screw things up. Like linkages etc
Brianator
Gettin' er done!
gotcha. I'll take a pic of it but I didn't touch it besides bolting the filter adapter to it.