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The LT500R used a NGK BR8ES stock, I ran a BR9ES which was a little cooler plug. To change the coolant there is a plug on the bottom of the water pump assembly, remove with and 10mm socket and fluid will drain. Take the rad cap off when draining and simply replace the drain plug and refill.
I am not 100% certain, and I am no mechanic; However, I have always used 0.028" on my 1996 Suzuki King Quads with no problems.
The spark plug gap for this kind of ATV is .035.
Look for arcing from the plug wire, if the wire is bad the spark will jump to the easiest path to ground, skippjing the plug completely.
it could be a bad spark plug wire or the plug could be gapped to much
.028
it sounds kinda like a stator problem or spark plug or cdi box
First take your seat off. then take your side panel off, find your spark plug wire to the spark plug, pull up until it comes off, make sure you are pulling on the boot and not the wire. then use your spark plug wrench that came with the ATV, it will fit right down in there. make sure its all the way down and turn to your left. Place the new plug the same way.
spark gap is 0.28mm.
In the cylinder head attached, to the top of the cylinder.
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Would you use lawn mower plugs in your car?? NO!!!!