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1. Tour timing could be off.

2. Low compression. Check gaskets.

3. Wrong spark plug type.

4. Bad coils.

5. Fuel-air mixture is not right.

6. Other prolems, e.g. bad leads, choke/enrichment problems, etc.

Unless you know how to trouble shoot engines, I suggest to take it to a shop. 1. Tour timing could be off.

2. Low compression. Check gaskets.

3. Wrong spark plug type.

4. Bad coils.

5. Fuel-air mixture is not right.

6. Other prolems, e.g. bad leads, choke/enrichment problems, etc.

Unless you know how to trouble shoot engines, I suggest to take it to a shop.

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