motor wont start when hot??

[millerfiller]

i have a 1979 johnson 50 hp tiller manual start motor that when it gets up to operating temp it wont start....model #50RL79C / serial # c 8045174 . i believe its a commercial motor that was used in the coast gaurd. it runs great and starts when cold within 2 to 5 pulls. would it be possible that it is the coil or power pack ?? any help would be appreciated. !!

 

[Mas]

Re: motor wont start when hot??

Test the spark when at temp...make sure the spark and jump a 7/16 gap with a spark tester.

MAS

 

[rickdb1boat]

Re: motor wont start when hot??

Sounds like the pack if you have no fire at all. Try starting it on muffs and point a hair dryer real close to the pack and see if it dies faster than is usually does.

 

[tashasdaddy]

Re: motor wont start when hot??

have to agree 99% power pack, is heating up and failing. let it get warm enough to cut off, check spark on both cylinders, if you have spark on one, swap the coils, and see if the problem follows the coil, if so replace the coil. if you have no spark on either, or the problem stays with the cylinder, replace the power pack.