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Need Help Please

K

Kelly 1

New member
I have a 1982, 115 Johnson model # J115TLCNB . It starts fine and idles ok. When I open it up to full full throttle the motor loses power. It will slow down and then kind speed up again. Problem seems to vanish after about 10 mins. Looking for pointers
 
Start with the usual tests first
1) Spark - will each plug wire lead jump a 7/16" gap using a spark plug air gap tester?
2) Compression - Is the compression even on all 4 cylinders? No more than 15% variation.
3) Fuel - are you getting good fuel flow to the engine? Do you have a clogged filter, is your primer bulb good, is the vent on your fuel tank good, are the lines in good shape? Possibly a bad fuel pump diaphragm?

So what does the engine do when you give it throttle? Does it sound like it dies, just cuts off? This is a sign of a lean condition or a fuel restriction. Or, does it blubber spit and sputter? This is a sign of flooding or poor spark.

It could be possible that your timer base is sticking and not advancing the timing when you give it throttle.

Check out all these options first before you buy parts and start throwing money at the problem.
 
The motor starts fine. I'll idle for a few minutes and when I throttle up, it starts to accelerate up to full speed and then it loses power but continues to run along at low speed even thought the throttle wide open. Some times it will start to speed up and slow down again. Usually , I just slow down and in about 5 mins its seems to work fine.

I will check the all of the above. Thanks for your advice much appreciated.
 
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