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 Post subject: running lean?
PostPosted: Mon Mar 21, 2011 7:09 pm 
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848cc
848cc

Joined: Fri Jun 11, 2010 4:31 am
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Location: Perth
Hi,
my friend has recently acquired a mini clubman with a 1275 engine (we believe it has been bored out a little, not sure how much).

Anyways it has the 1.5inch carb and it only seems to run well with the choke out. With the choke in it seems like its not getting enough fuel.

Is this carby too small for this engine, or would it just need adjustment?

Another thought i had is that there could be a vaccum leak?

Ryan


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 Post subject:
PostPosted: Mon Mar 21, 2011 9:19 pm 
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Give Ash some flowers Nick .
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Joined: Wed Aug 09, 2006 1:22 pm
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Location: Toowoomba Region, QLD
If you put your finger in the throat of the carb and lift the piston by about 1/16 to 1/8" how does the engine respond?

If the engine dies then it is too lean, if the engine's rev's pick up and run faster it is running too rich. If it slightly rev's up and then settles back down again then it is about right at idle. All this should occur when holding the piston in the carby up. This does not take into account if the engine has a needle that is really wrong with it.

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 Post subject:
PostPosted: Mon Mar 21, 2011 9:38 pm 
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848cc
848cc

Joined: Fri Jun 11, 2010 4:31 am
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Location: Perth
ok and how do i adjust it if it's too lean?


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 Post subject:
PostPosted: Mon Mar 21, 2011 9:58 pm 
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Yay For Hay!
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Joined: Wed Sep 08, 2004 9:27 pm
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Location: Wodonga - Vic/NSW border
there's a big nut under the carb, unscrew it a couple of flats with your fingers


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 Post subject:
PostPosted: Mon Mar 21, 2011 10:13 pm 
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848cc
848cc

Joined: Fri Jun 11, 2010 4:31 am
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Location: Perth
sweet so there shouldnt be any major issues with the carby then :) I'll give it a go!


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 Post subject:
PostPosted: Mon Mar 21, 2011 10:19 pm 
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1360cc
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Joined: Sat May 08, 2004 9:01 pm
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Location: Cairns, Nrth QLD
Ryan1980 wrote:
sweet so there shouldnt be any major issues with the carby then :) I'll give it a go!


Only unless it has the incorrect needle fitted.

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 Post subject:
PostPosted: Tue Mar 22, 2011 4:45 am 
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Mods rock!
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Joined: Fri Oct 03, 2008 9:02 pm
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It does sound like ^^ might be the fix, but it could also be a bit of dirt in the bottom of the jet (that's what the needle slides in to).

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