coil super hot and backfiring

[Rich1540]

1985 force 50hp model 507x5a
motor backfires and will stall eventually , coil got so hot it almost can burn the skin so changed it out to new one and still gets hot ,traced all wires acording to repair manuel all good ? was running good and over heated do to thermastate bad and head gasket blown all back to gether and that is what i have now ,all this from over heating ? please help out of ideas
Thanks Rich saginaw bay is supposed to be like glass this weekend !

 

[pnwboat]

Re: coil super hot and backfiring

Have you checked the points and condensers? Looked at the prices on those items. What are they made out of? Gold?

 

[Rich1540]

Re: coil super hot and backfiring

Just checked the gap on the pionts and that was good ,and no i havent seen the price yet for points andd condenser ? so are you saying the pionts and condenser are my head ache if so pionts look good not burnt look brand new ?

 

[john from md]

Re: coil super hot and backfiring

Check the voltage going into the coil. About the only thing that I can think of that will overheat a new coil is an overvoltage condition or a bad CDI.

Since you have a points type system, we can rule the CDI out.

Your problem can be the result of system voltage being too high.

John

 

[pnwboat]

Re: coil super hot and backfiring

Check the wire that goes from the problem coil to the points. It should be isolated from ground. Only time it will show continuity to ground is when the points closed together. If that wire is shorted to ground, then the coil will be drawing current through it continuously. Coil is designed for intermittent current/voltage flow when the points close. Also double check the voltage, like John suggested.

Cheapest price I've seen for one set of points is $23.38. Each condenser is $21.28.

 

[Rich1540]

Re: coil super hot and backfiring

would this also cause the backfiring ,the high voltage i mean,points are only putting out voltage when they are open 12.48 closed they do .06 thats on both ! thanks for the suggestions will check for high voltage when i get home tonight and will be back with resuts!

 

[Rich1540]

Re: coil super hot and backfiring

white wire from points to coil i have .06 volts on both coils (points closed) . then on the blue wire i have 12.24 all the time from the ignition is this the problem ? by the way thanks for the help!!!!

 

[Rich1540]

Re: coil super hot and backfiring

well its like this it was an easy fix ?
My loving 10 year old boy decided to help dad and left the key on for a few minutes and thats why i lost the coil and of course the one set of points !
and for the backfireing was do to the points fried enough were they were not closing all the way and i could not see the gap !
this site is great and thanks for all the help really appreciate it !
until next time hope everyone has calm winds and great Boating !!!!!!!!