Re: Hard Starting

Posted by 32model901 On 2014/9/23 6:45:48

Carburetor backfire is usually caused by four possible problems:

1. The ignition timing fires the spark before the intake valve is closed. (The distributor timing is very far off or the wires to the spark plug are in the wrong order or arcing is occurring between wire or posts on the cap.) If the point gap closed up the ignition timing will be retarded.

I'd check the point gap first then ignition timing.

2. The cam timing is has the intake valve open at the wrong time. (The timing chain has slipped or jumped a tooth.)

3. The intake valve is leaking badly. (Cracked, burned, bent, or very far out of adjustment intake valve.)

4. The exhaust valve on one cylinder is not opening, (damaged valve train on the exhaust side with the intake working normally.)