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Old 08-10-2019, 07:17 PM
Userix Userix is offline
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Default Predator 212 Won't idle with choke completely off

Haven't ridden my motorized bike with a 212cc predator engine in a month. I have cleaned out the carb and sprayed all orifices with carb cleaner. For some reason, it won't idle when the choke is completely off. If I hold the throttle slightly open, then it "pulse" idles. But once I give it half to full throttle, it runs perfectly fine. Still got torque and power. Just cannot idle normally. Oil was recently changed as well And oil level is good. If I close the choke halfway then it idles like it used to when the choke is completely off.

Couldn't find any air leaks either. Fresh gas was used and fuel Flow is perfectly fine. I can ride at and near wot for few miles without any issues with the engine dying. It's only when I let off the throttle completely does it completely die.

I have no clue why it's not running normally. Thanks in advance!
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Old 08-10-2019, 07:24 PM
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When you cleaned it did you remove the jet or idle screw? There should be a black phillups screw that deals with your idle circuit
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Old 08-10-2019, 10:38 PM
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I did remove jet and emulsion tube to clean it out and placed it back correctly. The black idle screw was left alone and is in the same position as when the engine ran fine last month. I have the "pulse" idle issue before I cleaned the carb. I will post a video of how it idles.

It's a strange problem because any throttle half and above and the engine runs perfectly fine. With choke halfway, it idles fine too.
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Old 08-10-2019, 10:39 PM
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Sounds like the carb might still be dirty
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Old 08-10-2019, 11:46 PM
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Have you pulled the pilot jet and checked it’s free of debris and that the rubber print is sealing properly?
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Old 08-11-2019, 06:37 AM
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If it pulse idles try using a strand of wire from a phone cord thats how thin it needs to be to clean all of the holes out
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Old 08-11-2019, 10:04 AM
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Today's gas has Ethanol blended into it. It's bad for carburetors. Letting it sit for a month probably wasn't a good idea. Best thing to do is pull the carb, soak it in a carb cleaning solution for a few hours, rinse it with water then blow it out with compressed air. Put it back together and make sure the base gasket doesn't suck air once it's back together. From now on I would suggest only adding enough fuel in the tank for a couple week's worth of runs. Don't let the fuel sit it the tank any longer than that.

http://blog.jackssmallengines.com/20...mage-up-close/

---------- Post added at 12:04 PM ---------- Previous post was at 12:00 PM ----------

* Disassemble the carburetor before soaking it! Sorry.
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Old 08-11-2019, 11:12 AM
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Im surprised you kids even know what a phone cord is these days.. Unless your meaning a "charging" phone cord.... That there is completely different...

A Twist tie(with out the paper/plastic) from the grocery store will be alot better than the Phone cords of sorts...
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Old 08-11-2019, 06:21 PM
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Aside from cleaning your carb better which is most likely the root of your problems. Check the spark plug socket to make sure everything is tight. I just had a similar isssue with a generator and I was stuck on it for a couple days. I cleaned the carb twice really good and it wasn't helping. I swapped the spark plug socket with another one I had and that was all it was. Simple thing to check
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Old 08-11-2019, 10:26 PM
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FWIW, your description indicates a too-lean condition, and in the idle circuit, I would surmise.
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Old 08-14-2019, 11:12 AM
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Thank you everyone! Turns out it was the pilot/idle jet. I never worked on this type of carb before, so I wasn't aware of the black plastic pilot jet on the outside of the carb. The scooter carbs I worked on all have the pilot jet inside the bowl next to the main jet. I ran a welding tip cleaner through it and now it idles like before
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Old 08-14-2019, 01:14 PM
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Quote:
Originally Posted by Userix View Post
Thank you everyone! Turns out it was the pilot/idle jet. I never worked on this type of carb before, so I wasn't aware of the black plastic pilot jet on the outside of the carb. The scooter carbs I worked on all have the pilot jet inside the bowl next to the main jet. I ran a welding tip cleaner through it and now it idles like before
Great! Glad ya figgered it out! Happy riding!
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