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Hello, my name is***** you have a question that needs answering?
When you cleaned the carbs, did you remove all of the jets from it?
How old is your fuel?
Are you sure that it is running on all cylinders?
That is a very rare failure for this engine. Have they taken it down to verify that?
Check and make sure that you are getting spark when cranking the engine. You can use a timing light on each plug wire and see if it flashes or not. Make sure that when the 0 or TDC mark on the flywheel is at the pointer when the top piston is at TDC.
That is really good. Good speed too.
I am in Fort Smith Arkansas.
Check the voltage on the red wires going to the switch box. At idle they should be over 25V, and go up as the engine speeds up.