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Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 10898
Experience:  40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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My b21 engine is backfiring back through thw Carburator, Any

Customer Question

My b21 engine is backfiring back through thw Carburator, Any thoughts
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.

Hello. My name is Tan.

This is caused by 1 of 3 things. 1 water in the fuel. 2 Timing is off. 3 Bad valve bent or sticking.

1 Check fuel filter for signs of water. 2 Check the timing and set correctly if off. 3 do a compression test.

It will be one of the 3.

Post back with questions.

Expert:  Tan replied 1 year ago.

If you need any specs please post the engine model number please.

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