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LR-3927 Ser# C810557634/mod# 3.??OAJ-1R//160175 Weak Spark


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Old 03-22-2010, 10:54 AM
southland3 southland3 is offline
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Default LR-3927 Ser# C810557634/mod# 3.??OAJ-1R//160175 Weak Spark

Need help. I recently purchased a used onan generator and now it will not fire up. It has a very weak fire @ the spark plug. I replaced the coil and still have the same problem. Any ideas?
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Old 03-22-2010, 12:32 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: LR-3927 Ser# C810557634/mod# 3.??OAJ-1R//160175 Weak Spark

Could be bad points or condenser.
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Old 03-22-2010, 01:51 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: LR-3927 Ser# C810557634/mod# 3.??OAJ-1R//160175 Weak Spark

If the ignition wires are old, they may be leaking voltage as well.
Andrew
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Old 03-22-2010, 02:25 PM
Major Tom Major Tom is offline
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Default Re: LR-3927 Ser# C810557634/mod# 3.??OAJ-1R//160175 Weak Spark

Check and (if necessary) set the breaker points gap to 0.020". Also a quick burst of electronics cleaner across the points may be indicated because an oily mist sometimes works its way up from the crankcase.

Best wishes,
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Old 03-29-2010, 11:17 PM
southland3 southland3 is offline
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Default Ser# C810557634/mod# 3.??OAJ-1R//160175 Weak Spark

Had new points & condenser installed. Fired up and ran good for two days, now no fire at points. Any suggestions??
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Old 03-30-2010, 04:01 PM
Major Tom Major Tom is offline
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Default Re: LR-3927 Ser# C810557634/mod# 3.??OAJ-1R//160175 Weak Spark

Not sure if your genset has an oil pressure switch but if so this is a likely candidate for intermittant failure. If one is present jump across it temporarily and see if it runs. Also check and trouble shoot any high limit temp. switches on the heads that might be in line with the ignition circuit.

Best wishes,
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