Cofe
Lieutenant Commander
- Joined
- Apr 23, 2009
- Messages
- 1,883
Re: Help 1980 35HP johnson runs like crap, with video UPDATE
Re: Help 1980 35HP johnson runs like crap, with video UPDATE
Your motor probably won't run on muffs because the added water pressure is leaking past bad gaskets into the cylinders. Here is a test.....Remove your spark plugs, hook the motor back up to the muffs. Crank the motor over several times. Look in each spark plug hole with a flashlight for any water. If there is water in a cylinder, the head gasket, or the exhaust baffle gaskets are leaking. If a head gasket is leaking between the cylinders, or into a water passage the compression readings would look like the ones you're getting.
You can order the individual gaskets and the price is not too bad. Here is a link to parts, and diagrams of your motor. http://www.boats.net/parts/search/BRP/JOHNSON/1980/parts.html
Re: Help 1980 35HP johnson runs like crap, with video UPDATE
Your motor probably won't run on muffs because the added water pressure is leaking past bad gaskets into the cylinders. Here is a test.....Remove your spark plugs, hook the motor back up to the muffs. Crank the motor over several times. Look in each spark plug hole with a flashlight for any water. If there is water in a cylinder, the head gasket, or the exhaust baffle gaskets are leaking. If a head gasket is leaking between the cylinders, or into a water passage the compression readings would look like the ones you're getting.
You can order the individual gaskets and the price is not too bad. Here is a link to parts, and diagrams of your motor. http://www.boats.net/parts/search/BRP/JOHNSON/1980/parts.html