take it to the shop and have them plug it up for a diagnostic. amazing what computers will tell you these days.

Had my good buddy do a routine service this summer on my boat. Lucky for me he has the computer program to plug up and get the diagnostic for Yamaha engines. after plugging it up and turning it on, i got an error message saying "thermostat stuck in on position" causing my motor to burn cold. what does that mean? I dont know. But if it was not identified, it would have caused a catastrophic engine issue several months or even years down the road.

Spend the little extra cash and get that done and be done with it.