Spark plug change in generator

Question

Per the Onan manual it recommends a spark plug change around 500 hours. Ours is coming up to 420 so I checked the spark plug before hand since the Jayco didn't come with any records. It practically looked new.. the electrode wasn't worn one bit. Is that normal? Typically I would think it would be worn at least a bit.

It is slow to start sometimes most times takes 2 attempts but if it's ran recently on the 1st try it'll fire right up. I'm starting to think that's fuel related. I have the number it'll be interesting to see if the auto parts store carry it.. then I'll probably have to argue it's for a generator I don't think Onan will show up in there system.

old-biscuit · Answer

Previous owner may have put a new spark plug in hoping to cure the hard start problem.No need to change a perfectly good spark plug...just gap it and use it

texas · Answer

If it is working why change it. Your problem is not your plugs. Could be choke a little out of adjustment. Some fuel problem. But from what you tell us. It must be something minor.

azrving · Answer

Spark plugs in modern engines can last a very long time. The problem comes when the plugs haven't been pulled in so long that they are seized when you do try to take them out. Gap the plug, use anti seize on the threads and torque them per the manuals spec.

handbasket · Answer

How far away is the fuel tank, and how often do you run it? I've had 3 Onan 2.8's, 2 in previous class B's and one in my current C-minus. All were slow starting if they'd not been run for a week or so.

I'm pretty sure that this is caused by the fuel draining out of the line back to the tank. I think the 4000 Microlites have a prime function on the start switch that will overcome this.

Jim, "Mo' coffee!"

ericsmith32 · Answer

I gapped it and put it back in.. didn't think of the anti-seize. Getting to the point in my life where I've realized I've spent to much money changing things that didn't need it! The generator is in front of the axle and tank is right behind so maybe 6ft max. Seems to run ok after it starts.  Sounds like it's acting normal but I know it needs to be used more. Ran it for 2 hours with the AC and carpet cleaner running should be ok till next month.

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Spark plug change in generator

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