150 johnson start problems

[mark.j]

hey guys my 95 150 wont start, i installed new plugs and the battery is charged, when i was checking for spark i touched a plug to the block and the motor started and it ran for about a minute then died, but would not restart or could not get a spark, maybe kill switch ? thanks in advance.

 

[ezeke]

Re: 150 johnson start problems

This thread should help:
http://forums.iboats.com/showthread.php?t=158071

This one is good, too: http://forums.iboats.com/showthread.php?t=225510

 

[mark.j]

Re: 150 johnson start problems

thankyou, i will try that, however i still dont understand why the motor started when i touched the plug to the block while i was checking for a spark?

 

[ezeke]

Re: 150 johnson start problems

Not enough information in your question to diagnose the problem. However you need 300RPM to form adequate charge for spark and having some plugs out makes it easier to reach that RPM; A fully charged, powerful battery and spotless cable connections usually overcome that problem.

 

[mark.j]

Re: 150 johnson start problems

thanks,i'll check that as well.

 

[mark.j]

Re: 150 johnson start problems

update, the motor started after i unpugged the black and yellow wire and is still working i guess i need a new kill switch?

 

[ezeke]

Re: 150 johnson start problems

The kill wires work by grounding the wire to the engine block which grounds the powerpack to instantly keep it from firing. When you turn the key to off, the black ground from the engine is connected to the black and yellow. Pulling the emergency lanyard also connects the two wires so check that as well.

If there is fault in the ignition switch or the emergency kill switch, replace them.

There is also the possibility of a short to ground.

When testing or working on the wiring, be sure to disconnect the battery; any voltage riding the black and yellow wire can instantly destroy the powerpack.

 

[mark.j]

Re: 150 johnson start problems

yes, i will disconnect the battery thanks for the help.