Slow Cranking Force Motor

[snace99]

I have a 1990, Force 120HP, L-Drive motor. I just bought a brand new battery. When I turn the key the motor cranks so slow, it's not even close to turning over. I used jumper cables and bypassed the solenoid switch and battery cable. Same thing happened. When I remove the spark plugs, it turnes over fine. As I install each plug the cranking speed reduces. Could my starter be unable to produce enough torque to turn the engine with all plugs (full compression), but OK with the plugs removed (no compression)?

 

[rogerwa]

Re: Slow Cranking Force Motor

I had a 50hp Force and your symptoms sound like mine when my starter gave up the ghost. I'd try to rebuild it and see what happens..

 

[petryshyn]

Re: Slow Cranking Force Motor

connect up a voltmeter to the starter as shown. Take a reading while attempting to crank. If you have less than 9.6 volts, it a voltage supply problem (bad cables, connections, solenoid) If you have more than 9.6, and it doesn't crank, its a starter motor problem.....<br /><br />

 

[snace99]

Re: Slow Cranking Force Motor

Thanks. I will try that this weekend and let you know how it goes.

 

[moderator1]

Re: Slow Cranking Force Motor

Moving to Outboards