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  #1  
Old 09-05-2017, 01:46 PM
JayBrown JayBrown is offline
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Backfiring

I just got my s&S. Running and timed but it back fires through the carb under power, when it's idealing it runs awsome and when I throttle up it fine but as soon as I put it into gear it starts backfiring anyone have any ideas? What size carb should I be running? Can you turn a auto carb into a marine carb?
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  #2  
Old 09-05-2017, 02:14 PM
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mikeg205 mikeg205 is offline
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yes you can turn an auto carb into a marine carb as long as you put all the parts on it... but bette to get a marine carb.
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Old 09-05-2017, 02:44 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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You most likely have two plug wires crossed. Follow the firing order stamped into your intake manifold and hand trace each wire. This happens more often than you think. When I got my '77, it had two wires crossed and had the same exact symptoms. It also had an automotive carb and starter.

I rebuild marine carbs and can build you a proper marine carb for $425 delivered.

The backfiring through the carb has likely blown your power valve.


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Rebuilding Holley Carbs $289
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Old 09-05-2017, 02:47 PM
JayBrown JayBrown is offline
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What size carb do I need? I think mine is to big as it was just rebuilt
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Old 09-05-2017, 02:49 PM
JayBrown JayBrown is offline
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Thanks peter where is the power vale? In the carb? I will check the wires
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Old 09-05-2017, 03:08 PM
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etduc etduc is online now
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What Peter said. ^
https://www.youtube.com/watch?v=Y3hZrW4Ryo4

Should be a 600cfm carb.
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Ayyyy!

2004 Red/White/Black something or other.

Formally, 1994 RED Mastercraft 205, Chevy 5.7 TBI.
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Old 09-05-2017, 03:14 PM
JayBrown JayBrown is offline
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Ok thanks what is the firing order on the distributor cap?
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Old 09-05-2017, 03:37 PM
JayBrown JayBrown is offline
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Is this right?
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Old 09-05-2017, 03:50 PM
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Quote:
Originally Posted by JayBrown View Post
Is this right?
Yep.
Some 302 (HO) will have the same firing order. Earlier 260,289,302, had a slightly different
firing order. So surfing the web, persons can get the wrong firing order.
Here's another link: http://www.gtsparkplugs.com/firing-o...351M-400M.html
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Ayyyy!

2004 Red/White/Black something or other.

Formally, 1994 RED Mastercraft 205, Chevy 5.7 TBI.
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  #10  
Old 09-05-2017, 03:57 PM
JayBrown JayBrown is offline
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Ok i will check my wires and see if thats the problem fingers crossed only been 2 years since I drove it got to take it out around the lake on ideal was nice but want to open her up
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