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The firing order on the 300U is 1,3,4,2.

If the spark plug cables are removed for any reason, note the position of each cable on the distributor. Keep a minimum clearance of1/4 inch between the spark plug cables and the cylinder head. By maintaining this clearance, shorting-out the spark plug will be prevented and the cable will be away from the extreme heat of the cylinder head. If the cable touches the cylinder head, the heat of the engine will soon cause the rubber to become soft, ruining the cable.

The engine firing order is 1, 3, 4, 2.

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15y ago

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