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weak ignition? (small engine)
I have an old tiller with a Kohler single-cylinder 4-stroke engine. It
lost all power (over about 30 secs), and now won't start. Since then, - Replaced spark plug. (Which does spark, when grounded to the head.) - Points look OK. - Compression looks OK (75 psi). - Cylinder is getting fuel (plug gets wet, and exhaust smells.) - Carb float valve works, and float seems OK. - Coil resistances look OK. - I cranked it in the dark, and didn't see or hear anything bad around the coil. I wonder if I have a weak spark when the plug is installed. But, a new coil costs $75, which is a kind of expensive experiment. To test the coil, I made a 10:1 voltage divider (with a HV 10M resistor), and looked at the spark plug voltage with a scope. With the plug not grounded, I see a 4-6KV pulse. When the plug is grounded, this drops to about 1KV. I get the same 1KV when the plug is in the cylinder (no fuel). Questions: - Is above consistent with a 'weak' coil? - Is there another way to test that? And, any other thoughts would be appreciated. G |
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