1970 33hp Johnson- hit a log

[Dworth259]

So i hit a log at full throttle and now my boat will not go fast like its suppose to. Its running like its at half throttle but i got it a wot. Went through the motor and gearcase and no damage. Possible prop is just spun or what,and how would i be able to tell.

 

[Bosunsmate]

Re: 1970 33hp Johnson- hit a log

If your engine speeds up with no corresponding boat speed- its a spun prop.

 

[Dworth259]

Re: 1970 33hp Johnson- hit a log

What if the rpms are not high

 

[Bosunsmate]

Re: 1970 33hp Johnson- hit a log

If rpm dont increase then look at your engine again.
Compression test is most important

 

[Dworth259]

Re: 1970 33hp Johnson- hit a log

Is it possible to have lost power to a cylindersince when i hit the log the motor came up out of the water and the rpms went up when it did

 

[Bosunsmate]

Re: 1970 33hp Johnson- hit a log

Is it possible to have lost power to a cylindersince when i hit the log the motor came up out of the water and the rpms went up when it did

Maybe, compression test will tell you the score

 

[F_R]

Re: 1970 33hp Johnson- hit a log

Hope it was just a coincidence. If it did lose a cylinder due to over-revving, it probably is fatal. The vacuum cut-out switch might be the culprit, but that would be so extremely unusual that it's almost unheard of.