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Farmall & IHC Tractors Discussion Board

Re: 47 cub wont start help


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Posted by JRSutton on May 18, 2012 at 05:58:58 from (75.130.109.233):

In Reply to: 47 cub wont start help posted by casefrank on May 17, 2012 at 20:41:19:

Nothing jumps out at me - but black smoke sounds like it's getting plenty of gas into the cylinders - if not too much - just not burning properly.

(I'm assuming you've tried this without the air cleaner attached - and ruled that out for blockage - if not - try that first.)

My first guess would be that you're flooding - but typically once you get it to start after flooding they usually stay running ok.

Does the carb drip gas at all?

Could also be a weird combination of flooding - and restricted fuel from the tank. Make sure you have a solid stream TO the carburetor.

Also sounds ignition related - where you get fuel but it doesn't burn right - but assuming all those components were good to begin with - as in it used to run fine?

Might want to at least go over everything on that side - clean your points - make sure your cap is dry, etc.

Not sure about adjusting valve lash on a cub - but if it's something you can do - I'd recheck that.


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