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Idle - stalling - running issues


Robert Sawyer

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So I have a 2018 Massimo 500 and bought with 100 miles on it and only 400 now. It has worked and ran perfect. I noticed towards cooler weather it wasn’t idling and then just not running good at all. 
things done - replaced the ignition coil replaced the plug checked cord for voltage. Drained gas cleaned tank went to a Rec fuel. Cleaned fuel filter screen at bottom of fuel filter. Cleaned main line and screen (had some residue) no air leaks I can find. Checked cleaned air filter. Cleaned and tested air intake control. Removed cleaned and tested the device moves o ring also fine. 
I am not at a loss I can not get it back to where it was I have attached video of running etc 

HELP 

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You've said that the cooler weather seems to be a factor. Is there a heated area where you could test that idea? Or put a tarp over the motor, with a heater underneath, in the garage? It really sounds fuel related. But air and fuel work together. So maybe it's an air sensor or some thing. Sounds like you've had a similar train of thought. Don't know where you are. But in places where there's a lot of ethanol in the fuel. It can be a problem for small gas engines. Creating a problem that's difficult to pin down. Not unlike yours. Have you checked the injectors? I really have no idea, just throwing out suggestions till someone who might know comes along.

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