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1980 el Tigre trying to get my friend's sled running. Sled would not start, found dime size hole in the piston. Replaced the piston..I now have great compression and getting vacuum pulse to the fuel pump. I rebuilt the fuel pump as well. Also...drained the carbs and fuel tank, put fresh fuel in it. Problem...it still won't start. If I shoot just a little starting fluid in either cylinder it will run for a second.

My question is can weak spark create a lean condition and blow a hole in the piston?
I'm wondering if the starting fluid will light with weaker spark whereas the fuel won't?

I can see fuel in the lines going to the carbs, it's obvious to me the bowls are full and fuel is in the line.
 

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When that one goes, it's usually due to an air leak at the carb flange or a plugged main jet. Occasionally it can be the crank seal or a base gasket leak.
After you get it to run again, you will have to check these.
 
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