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Tractor Talk Discussion Forum

Nuffield M4 misfire under load

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Gregf

04-10-2006 01:32:25




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I have a nuffield m4 in good overall condition it runs fine starts first pop no smoke etc but under load it gets a bad misfire which will only stop if I lower the revs and give it some choke.
Thus far ive striped the carb down and rebuilt it still no go. Any ideas what could be causing this problem or what to look at next.

Cheers

Greg




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gregf

04-10-2006 01:45:33




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 Re: Nuffield M4 misfire under load in reply to Gregf, 04-10-2006 01:32:25  
Oh and it is a petrol engine model if that helps



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Alexis Doiron

10-26-2006 18:18:47




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 Re: Nuffield M4 misfire under load in reply to gregf, 04-10-2006 01:45:33  
Did you get it to stop or are you still trying to figure it out? I had a similar problem with my pm4 and I had a burnt exhaust valve.Also some ignition repairs,but I suspect intake valve bad on yours because it acts up under load. i would recommend good compression test to start.Where are you located. im interested in the fact that you stripped and rebuilt yourr carb.



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