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Dball

Spark plug for 520h

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Dball

Not sure if this is the correct place to post this but what size plug came with the onan motor if you have changed it what have u found to be best and y thank you for any and all help I do not have a manual for mine some I'm winging it on some things 

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squonk

I use Autolite 104

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DougC

If you like a Champion spark plug a RS17YX is  the number.

That being said. I offer this as another choice and would never intend to say Champion is better or worse than Autolite.

I am an AC Delco  guy, but use another brand in my :wh:'s cause I've never taken the time to see what spark pug crosses over to AC.     :lol:

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Kurt-NEPA

+1 on the Champion RS17YX .  Both my 520H's are running them.  I've tried other, but these run the best.

 

 

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Dball

What I have found on the net is mixed stuff on plugs what I found was champion rc14yc I then some say run the 17 so not sure which would be best never owned anything that used the onan motor I was thinking of getting the A/C Delco platinum plugs just unsure what size 

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Kurt-NEPA

Wheel Horse (Toro) originally specified the RC14YC plug.  Later they issued a technical bulletin changing that to RS17YX.  Many of us think that was to accommodate 10% Ethanol fuel.

 

I've used both plugs,  Both work, but the 17 plug seem to work better - smoother operation.  Both  my 520H's start up and run perfectly on the 17 plug. (I do have electric fuel pumps, I highly recommend them).

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