Yamaha WaveRunner FX Cruiser SHO - Recent Questions, Troubleshooting & Support - Page 6
What does 6.8 compression ratio m3an in kpa or psi on a 30d yamaha outboard motor
It means your engine's cylinder volume from the piston being at bottom dead center to top dead center divided by it's compression volume (the volume in just the cylinder head with the piston at TDC) equals 6.8, which is a very low compression ratio.It is not a measure of PSI. It's the ratio of how much the gas/air mixture is compressed before ignition.The engine is taking 6.8 units and compressing it into 1 unit before ignition - a ratio of 6.8 to 1.
No spark yamaha 115 v4 outboard
That can be a lot of things...
First off all, disconnect the wire plug to the remote control.
Crank the engine manually ( battery positive on the startermotor post ).
If now you have sparks, then the fault is in your remote control.
If still no sparks, you'll have trouble in the CDI, pulser coils or generator coils.
Wiring Yamaha outboard tach
Yellow wire is batt+ after ignition switch
Black wire is the ground
Yellow wire is the rev-pulse
Blue wire is the light.
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