You are correct. Normally only the main oil tank being low (bottom switch closed/red wire grounded) and a thermoswitch being closed (pink wire grounded) will set the alarm.
However, in some Yamaha 115 two strokes a faulty power supply to the CDI unit can set the alarm. Check all electrical...
Yams are not the best pissers known to man.
What are using to determine a good **** from a not so good ****?
If the motor is not having an excessive temperature event I think your cooling system is just fine.
Aging Primestart systems are known to make a motor be hard to start when cold.
Like underwear for old folks, it depends.
If the motor has been idling prior to shut down then the ratio of oil would have been 100/1. Then at next start the gas/oil ratio would be 100/1.
Now if the motor was running at say wide open throttle at a gas/oil ratio of 50/1 and then shut down, then...
What are you doing to manually choke the motor?
That model does not have a mechanically activated choke plate. It uses a Yamaha PrimeStart system. Automatic fuel enrichment.
If the motor is not over heating then the water pump flow is more than sufficient, no matter what amount comes out the...
"OEM thermostat was corroded and rotted out after 60 hours of use"
We love the prices of cheap stuff no matter where it comes from. Then biitch about the quality rather than buying higher quality foreign made parts.
On the starter itself? On the starter motor solenoid? On the starter motor relay?
Start at the starter motor itself. Jumper battery power and ground directly to the starter motor. Using suitable sized battery cables. Does the starter motor now crank the main motor? If not, it is the starter...