0,80 to 0,90mm (from Haynes manual)
Look for it in the cylinder head, at the top of the engine. You can find it easily by following the spark plug lead or wire.
The spark plug gap for a Polaris Indy 500 should be set between .025 and .028 inches. A new spark plug should need no adjustments as they come preset from the factory.
it sounds kinda like a stator problem or spark plug or cdi box
Ngk br8es.
A 1968 Ford Galaxie 500 with a 390 engine should use a spark plug such as an E3 brand spark plug. This plug should have a tapered seat with 18mm threads.
Is asking
0.070
To change a spark plug you need to take off the seat and the side panel on the right side. After you do this the spark plug will be in front of the carb and on top of the engine block.
.035 inch
0.6mm - 0.7mm
it is located under the gas tank. once you remove the tank you will see a spark arrester pull that our and look down into where it was and you will see your spark plug
Take the seat off , then the right side cover . The spark plug will be behind the ground cable on top of the motor . Should be a special spark plug tool in your tool kit .