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64 international cub misses after 10 min

K

Ktregre

New User
Please help. Got a 64 cub that misses after it warms up. Changed points ,condenser,rotor,cap,wires,coil and plugs. Checked the compression when cold and warm. It dropped on average 10psi. All over 110psi. Cleaned carb. Runs fine with no miss when cold. Started when the coil went bad. (Coil was getting very hot). Also cleaned inside the distributor for any oil as mentioned on an earlier post. Any suggestions would be appreciated.
 
Never good to throw parts at a problem till you know where the problem is because you can and will cause more problems.
When the problem starts check spark it need to be a Blue/white in color and jump a 1/4 inch gap or more at all 4 plug wires.
Next check gas flow by pulling carb drain plug and make sure it has enough flow to fill a pint jar in about 3 minutes.
Also as said slowly remove the gas cap and listen for a blowing out or suction when you do so.
Or the last thing or one of the last is your valves may need to be adjusted since as the engine gets older the valve gap closes up which can cause a miss
 
Could have a leak in the manifold. Leak gets worse when it gets warm. When its missing can you make it run better by using the choke a little. If so could be the manifold.
 
Thanks for the suggestions. I tried moving the choke a little with no change other than starting to flood out. If it was a valve, shouldn't i have low compression when it's still hot.? (I'm only guessing). I did notice that when i spin it over with the spark plugs out, it only sparks as I let up on the starting rod. I'm totally lost.
 
If it only sparks when you let up on the starter you have a wiring problemh Do you have batt voltage at the coil when the starter is enguaged. That would be a place to start no or low voltage when starter is enguaged goes back to check wires to see why
 
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