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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14436
Experience:  Certified on Onan and Generac generators
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1986 onan 6.5NH-3CR/16004P genset 1611 hours runs fine,

Resolved Question:

1986 onan 6.5NH-3CR/16004P genset 1611 hours

runs fine, but when it loads up it starts hunting. I can settle it down by holding the gov linkage, but as soon as something new comes on to load it up, (like coffee maker) it starts hunting again. could it be the governor spring has lost it's tension?

Is Champion RS17YX @.025" CORRECT FOR THE PLUG?

Thanks, Marc
Submitted: 6 years ago.
Category: Small Engine
Expert:  Hank F. replied 6 years ago.

Hello, welcome to Just Answer.


Yes, that is the correct plug and gap.


Hunting, or surging, is generally caused by a lean condition. It most often means the carburetor needs to be disassembled and cleaned, or replaced. Has this generator been sitting for a while?

These carbs are very finicky, and cleaning sometimes is not enough. If cleaning it does not fix the problem, the carb must be replaced.

A quick test to see if the carb is the issue is to remove the air filter and spray a little extra gas into the intake while it is surging. If the extra gas causes the engine to smooth out, the carb is the most likely suspect.

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