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Hello. My name is Tan.
We need to start with a compression and spark test. The compression must be 90+ psi with no more than 10% difference between cylinders. The spark must jump a 7/16 " gap on a spark gap tester.
The engine can idle good and still have cylinders not getting spark or have low or no compression.
Do these checks and [post back with findings.
There are 2 more tests to be performed when running at full throttle. 1 squeeze the primer bulb,2 choke the engine. Does it run any better?