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 Back fire after gutted 
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Post Back fire after gutted
Motor runs great. took bog out. Now backfires from WOT.

What the hell do I do ??


Wed Jun 05, 2013 10:54 am
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Post Re: Back fire after gutted
got a leak some where

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Wed Jun 05, 2013 10:58 am
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Post Re: Back fire after gutted
Adjust ur carb that's what I did


Wed Jun 05, 2013 10:58 am
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Post Re: Back fire after gutted
When you gutted it, did you leave the stock outlet pipe?


Wed Jun 05, 2013 11:02 am
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Post Re: Back fire after gutted


Wed Jun 05, 2013 11:03 am
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Post Re: Back fire after gutted
Yes I left the stock outlet pipe. Also turned the idle jets out to 2.5 turns. That removed the bog


Wed Jun 05, 2013 11:30 am
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Post Re: Back fire after gutted
Go some more


Wed Jun 05, 2013 11:31 am
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Post Re: Back fire after gutted
past 2.5 turns on idle jet ? how much ?


Wed Jun 05, 2013 12:01 pm
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Post Re: Back fire after gutted
How Far Did You Stick The Outlet Pipe Into The Can?

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Wed Jun 05, 2013 4:34 pm
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Post Re: Back fire after gutted
I kept the original outlet pipe and just drilled additional holes inside the can. Breathes much better and throttle response is great but now it back fires.

Also opened up the air idle to 3.5 turns.


Wed Jun 05, 2013 4:46 pm
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Post Re: Back fire after gutted
Mine did the same. Head job fixed it. A head job is always the answer. Lol


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Wed Jun 05, 2013 4:56 pm
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Post Re: Back fire after gutted


Wed Jun 05, 2013 5:40 pm
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Post Re: Back fire after gutted


Thu Jun 06, 2013 4:40 am
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Post Re: Back fire after gutted
Steady air stream coming behind this fitting. But I think its welded on the inside ? Could it be the cooling fan air or is this fitting leaking.

How do you test it ?


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Thu Jun 06, 2013 9:24 am
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Post Re: Back fire after gutted
you would know if its hot exhaust air .... most likely the cooling fan venting near there, prolly to help cool it.

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Thu Jun 06, 2013 12:24 pm
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Post Re: Back fire after gutted
Yep, it's just the fan air. FYI, I ported that carb intake some also. Fatten it up a lil more.

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Thu Jun 06, 2013 10:52 pm
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Post Re: Back fire after gutted
Is it backfiring only when you rev and let off with no load. If so, that is pretty typical for these open exhausts. If it is still doing it when you rev and let off under load (prop in water) then worry about it.

Mag10


Fri Jun 07, 2013 11:03 am
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Post Re: Back fire after gutted
Running great. Opened up the idle air mixture 3.5 turns. No bog. No backfire under load. Only backfires on land at WOT to zero.

Problem is going away on its own. Motor is still breaking in. I think it's starting to run better.

Thank you all !


Fri Jun 07, 2013 3:51 pm
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