1956 Johnson 30hp Boat Launch

[SuperUnknownMC]

Hi Guys,

My motor seems to be running great, but wont plane off. I have a top speed of 8 mph. Can you watch my video of the motor and share your thoughts.

Thanks, very much
Jim

http://www.youtube.com/watch?v=00cUvPaD19A

 

[Daviet]

Re: 1956 Johnson 30hp Boat Launch

Have you checked the simple stuff, spark and compression?

 

[coolguy147]

Re: 1956 Johnson 30hp Boat Launch

carb adjustment?

 

[lindy46]

Re: 1956 Johnson 30hp Boat Launch

Make sure the throttle plate is opening all the way at full throttle. The cam follower roller only works for about 2/3 of throttle. After that, a spring loaded rod on the port side of the motor takes over and opens the plate the rest of the way. Make sure that rod is adjusted properly.