Performing Compression Test

[muskies]

Never did this on an outboard. Should I have the gas connected? Do I have to ground the ignition? If so, where? This motor is a 1976 70hp Rude.<br /><br />Thanks,<br />Muskymani***

 

[rickdb1boat]

Re: Performing Compression Test

Warm up engine,<br />remove all plugs,<br />Ground all plug wires,<br />connect compression Gauge'<br />Hold throttle wide open,<br />Crank at least 4 times for proper reading!

 

[muskies]

Re: Performing Compression Test

Thanks Rick!<br /> Do I have the gas connected? Don't want to scuff the cyl. ?

 

[rickdb1boat]

Re: Performing Compression Test

Yes, leave Fuel line connected!

 

[petryshyn]

Re: Performing Compression Test

one last thing......be sure to have the same number of "hits" on each cylinder, or your readings will be skewed.....<br />