Stuart_B
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| posted on 16/3/09 at 07:05 PM |
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backfire
hi all, since i have made a new manifold, for my bike carbs and put a new air filter on it, i get a poping/backing firing at the carb end, from seems
to be the outer 2 carbs, what would cause this?
lack of fuel or to much air or something else?
your throughts please
thanks
stuart
[Edited on 16/3/09 by Stuart_B]
black mk indy, 1.6pinto on cbr600 bike carb's.
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flak monkey
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| posted on 16/3/09 at 07:07 PM |
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Spitting back through carbs/throttle bodies is usually down to two main things:
1 the mixture is too lean
2 the ignition timing is wrong (too far retarded)
If you havent fiddled with 2, then it will be 1. It could be the new air filter is much freer flowing and letting more air through so its now slightly
lean.
You may be able to adjust it out with the idle mixture, depends how the carbs work.
David
[Edited on 16/3/09 by flak monkey]
Sera
http://www.motosera.com
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mookaloid
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| posted on 16/3/09 at 07:18 PM |
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As above ^ can't really add anything to that 
"That thing you're thinking - it wont be that."
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jacko
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| posted on 16/3/09 at 07:42 PM |
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inlet manifold air leak? spray wd40 around the manifold and see if the revs go up
bike carbs tend to spit back when the engine is cold
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jacko
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| posted on 16/3/09 at 07:47 PM |
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this may help you
quote:
http://www.locostbuilders.co.uk/viewthread.php?tid=106664
Jacko
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britishtrident
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| posted on 16/3/09 at 07:52 PM |
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Are the carb throttles properly synched ?
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Stuart_B
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| posted on 16/3/09 at 08:08 PM |
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hi, thanks, i will check the timming tuesday, and check for leaks. as well, well when i had the carbs on before there was no back fire, so not sure
about if they are properly synched, but they where fine.
could i use rubber as a gasket if it is not sealing up enough against the head?
thanks
stuart
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MakeEverything
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| posted on 16/3/09 at 09:44 PM |
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buy a sheet of gasket material and make one. Seal it with the gasket sealer / bonding stuff you can buy.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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