Backfiring after starting HELP

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RyanM3

Seaman Apprentice
Joined
May 22, 2011
Messages
38
Finally got my boat cranked! Feels great to accomplish after 3 weeks of frustration. However, it now backfires when i start it. It will stay on longer if I close the valve at the top of the carb. The boat has been sitting for 4 years. If I dont close the valve, the carb catches on fire after backfiring. Also, alot of smoke comes out before backfiring. What should I do?

1987 Glasstream 172 cutlass
3.0L 4cyl mercruiser i/o
 
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dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,116
Re: Backfiring after starting HELP

sounds like the timing is off, have you checked it??
 
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RyanM3

Seaman Apprentice
Joined
May 22, 2011
Messages
38
Re: Backfiring after starting HELP

no I have not. How do I go about doing that?
 
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dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,116
Re: Backfiring after starting HELP

timing light connected to #1 plug wire
 
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RyanM3

Seaman Apprentice
Joined
May 22, 2011
Messages
38
Re: Backfiring after starting HELP

i dont have a timing light. Is there anything else I need to check?
 
CobiaXL

CobiaXL

Banned
Joined
Mar 8, 2010
Messages
353
Re: Backfiring after starting HELP

Firing order correct?Spark wires on correct?Points corroded?Fuel level to high,check to see if raw fuel is dumping in carb at idle.Watch your face if it backfires.1-3-4-2 clockwise on dizzy cap is your firing order.
 
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RyanM3

Seaman Apprentice
Joined
May 22, 2011
Messages
38
Re: Backfiring after starting HELP

Firing order is correct. Spark Wires on correct. Just changed the points.
 
rickryder

rickryder

Commander
Joined
Jun 24, 2010
Messages
2,722
Re: Backfiring after starting HELP

You can find the proper procedure in your service manual on setting the timing....
 
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