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rudyeng
MMT Addict
Joined: Mon Jul 30, 2012 7:40 pm Posts: 596
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Back fire after gutted
Motor runs great. took bog out. Now backfires from WOT.
What the hell do I do ??
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Wed Jun 05, 2013 10:54 am |
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DUCK HEARSE
MMT 1000 Club
Joined: Fri Apr 06, 2012 8:48 am Posts: 3161 Location: Alabama
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Re: Back fire after gutted
got a leak some where
_________________ Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover. - Mark Twain
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Wed Jun 05, 2013 10:58 am |
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forever draggin
MMT Elite Member
Joined: Tue Jan 13, 2009 7:10 pm Posts: 6664 Location: in the marsh with a boat load full of dead hookers
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Re: Back fire after gutted
Adjust ur carb that's what I did
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Wed Jun 05, 2013 10:58 am |
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banded-mallard
MMT 1000 Club
Joined: Wed Oct 07, 2009 8:18 pm Posts: 4310
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Re: Back fire after gutted
When you gutted it, did you leave the stock outlet pipe?
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Wed Jun 05, 2013 11:02 am |
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forever draggin
MMT Elite Member
Joined: Tue Jan 13, 2009 7:10 pm Posts: 6664 Location: in the marsh with a boat load full of dead hookers
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Re: Back fire after gutted
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Wed Jun 05, 2013 11:03 am |
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rudyeng
MMT Addict
Joined: Mon Jul 30, 2012 7:40 pm Posts: 596
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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
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Wed Jun 05, 2013 11:30 am |
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forever draggin
MMT Elite Member
Joined: Tue Jan 13, 2009 7:10 pm Posts: 6664 Location: in the marsh with a boat load full of dead hookers
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Re: Back fire after gutted
Go some more
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Wed Jun 05, 2013 11:31 am |
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rudyeng
MMT Addict
Joined: Mon Jul 30, 2012 7:40 pm Posts: 596
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Re: Back fire after gutted
past 2.5 turns on idle jet ? how much ?
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Wed Jun 05, 2013 12:01 pm |
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Buddy
MMT Addict
Joined: Mon Aug 06, 2012 9:06 am Posts: 579 Location: Tallahasse, FL
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Re: Back fire after gutted
How Far Did You Stick The Outlet Pipe Into The Can?
_________________ 1754 XSeries Kawi Powered PRODRIVE ...
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Wed Jun 05, 2013 4:34 pm |
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rudyeng
MMT Addict
Joined: Mon Jul 30, 2012 7:40 pm Posts: 596
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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.
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Wed Jun 05, 2013 4:46 pm |
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swamprat26
MMT F.E.
Joined: Fri Jul 31, 2009 5:01 pm Posts: 757
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Re: Back fire after gutted
Mine did the same. Head job fixed it. A head job is always the answer. Lol
Sent from my iPhone using Tapatalk
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Wed Jun 05, 2013 4:56 pm |
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forever draggin
MMT Elite Member
Joined: Tue Jan 13, 2009 7:10 pm Posts: 6664 Location: in the marsh with a boat load full of dead hookers
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Re: Back fire after gutted
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Wed Jun 05, 2013 5:40 pm |
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banded-mallard
MMT 1000 Club
Joined: Wed Oct 07, 2009 8:18 pm Posts: 4310
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Re: Back fire after gutted
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Thu Jun 06, 2013 4:40 am |
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rudyeng
MMT Addict
Joined: Mon Jul 30, 2012 7:40 pm Posts: 596
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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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eljefe
MMT Elite Member
Joined: Thu Jan 13, 2011 7:32 am Posts: 5210 Location: Beaumont Texas
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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.
_________________ You can't see the sunrise if your eyes are closed. dying aint much of a livin....
Black ops IITX marshstalker
1840 WC www.wccustomboats.com fuel injected 25 GTR
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Thu Jun 06, 2013 12:24 pm |
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Team Camo
MMT Sponsor
Joined: Thu Oct 01, 2009 4:49 pm Posts: 8536 Location: Bridge City, TX
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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.
_________________ 1846 GTB & 35 GTR Team Gator-Tail
Killer Kallz & ANGLE PORT dealer (409) 720-8949
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Thu Jun 06, 2013 10:52 pm |
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Mag10
MMT Pro Member
Joined: Wed Jan 14, 2009 12:31 pm Posts: 342 Location: Faribault, Mn
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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
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Fri Jun 07, 2013 11:03 am |
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rudyeng
MMT Addict
Joined: Mon Jul 30, 2012 7:40 pm Posts: 596
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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 !
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Fri Jun 07, 2013 3:51 pm |
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