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| Back fire through carby? https://www.ausmini.com/forums/viewtopic.php?f=2&t=77898 |
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| Author: | Kennomini [ Sat Aug 04, 2012 1:38 pm ] |
| Post subject: | Back fire through carby? |
How bad is it when the engine backfires through the carbies? I've only noticed it at idle when the throttle is hit a certain way. Am I right to keep driving it with out worry of a major internal engine failure until I get it tuned? |
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| Author: | 1310/71 [ Sat Aug 04, 2012 1:43 pm ] |
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I'd be more worried about the engine bay catching fire. What have you got behind the carbie insulation wise? |
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| Author: | drmini in aust [ Sat Aug 04, 2012 2:15 pm ] |
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`sneezing' it's called, usually is due to a lean mixture above idle; accelerator pump not working (Weber etc) or, no or too thin oil in the dashpots on SUs. |
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| Author: | peterb [ Sat Aug 04, 2012 7:52 pm ] |
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I'm only guessing that it's the motor you just put in??? Just a remote possibility, but it could also be sticky inlet valve if engine hasn't run for a while, if so it'll free up. |
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| Author: | Kennomini [ Sun Aug 05, 2012 10:09 am ] |
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1310/71 It doesn't have any insulation behind the carbies just the pipercross foam filters. drmini It's running 1" 1/4 twin SUs, I actually think the oil is to thick. peterb Your correct about the engine, it came out of a running car then sat in my shed for a few years before getting dropped in and hooked up. So far it's got about 120km on it since installation. So theirs no real threat of it going bang too soon, I understand super lean engines can burn out pistons and heat the engine up more than normal correct? |
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| Author: | cush [ Sun Aug 05, 2012 11:34 am ] |
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I had the same and it was a blocked jet and fuel line.. |
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| Author: | Kennomini [ Sun Aug 05, 2012 3:10 pm ] |
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On twins? would that cause one or both to backfire? |
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| Author: | TheMiniMan [ Sun Aug 05, 2012 3:41 pm ] |
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set too lean in mixture cold start with no choke sticky/dirty/grotty carby pistons & bells too light (or low level or no) oil in dash-pots low float level do you want more??? or will that lot do for now? 
bad condensor ignition far too retarded poor ign coil reserve burnt inlet valves/seats leaky manifold gasket/carby base gasket i can go on if you like???
&&& add any of & all of the above in any combination will do it too
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