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Misfiring problem in the first cylinder 120HP tohatsu

johnson87

New member
"we have changed spark plugs,

"we have changed spark plugs, changed fuel, compression is good at 120psi, carb. is clean. at low rpm it runs fine but once you accelerate it begans misfiring horribly. we believe the problem is in the first cylinder because when we remove the wire from plug it still runs, whereas with the other the engine cuts out"
 
You have to check the ignition

You have to check the ignition system parts by running the tests as found in your service manual.
 
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