50 HP Johnson loss of power

[jjroodie]

This is a 1996. It used to get to 5600 RPMs. Now,all I get is 3,500. I have rebuilt the carburators,replaced spark plugs and checked gap, replaced fuel filter,sprayed power tune on motor. Still, no power. Compression is 125 in both cylinders. I think it might be the timing. Is there anything else I should check?

 

[clanton]

Re: 50 HP Johnson loss of power

There is 2 plastic rollers on the linkage one on the carbuator and 1 on the timing linkage, both of these are a black roller with clear plastic sleeve over the them, check these and see if clear plastic is broke/missing. If you adjusted the linkage,you will have to readjust, after you replace roller. Check pulse hose to VRO pump.

 

[rudeafrican]

Re: 50 HP Johnson loss of power

Hi jjroodie<br /><br />Did you ever solve this problem? I'm having exactly the same symptoms on my 1990 40hp and have pretty much covered the same ground as you did....

 

[rickdb1boat]

Re: 50 HP Johnson loss of power

Also, check for good spark on all cylinders. Should jump at least 1/2"-7/16" to block using a screwdriver in the spark plug boot and hold it next to the block and turn it over using a fully charged battery.