Dave Piccirillo

Excessively high idle speed can make shifting into gear difficult.

Bought a 2014 Massimo MSU500 in September 2019 for 1500 not running. The spark plug threads were stripped in the head and I was able to repair it without t taking the head off. It runs great now. Also replaced doors, light/horn switch assembly, and some other things totalling about 500. I am pleased with this purchase. I don't know if your 2010 has EFI or carb but sounds like your problem is fuel pump or fuse if its EFI. If its a carb it probably needs taken apart and cleaned. Good luck.

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The EFI computer sets the fuel mixture based on the Engine Coolant Temperature (ECT) sensor.  Since your spark plug indicates a rich mixture and your engine temp reads cold, the ECT may be bad. I have seen this happen on EFI cars.  I don't think the ECT is very expensive or hard to change. Might be worth a try.