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Lister D - Carb Problems

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Post by Ally's_Engines Sun Mar 08 2015, 15:57

My Lister D type had poor compression, and after a long run it's really good now. But I have now encountered some strange problems with the carb. Whenever I'm running it and I want to speed it up, the engine cuts out. There is also a large build up of petrol and it comes rushing out when I push the sprung loaded choke open. The Mix control also seems to be useless when I want a rich mixture or if I want to stop the engine.
Should I get a new carb? Is the problem simple to fix?
Thanks
Ally

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1951 Petter A1, 1965 JAP model 6, 1950's Villiers mk10 compressor set, WW2 Douglas FT35, 1960's ATCO Villiers Lawnmower and Petter A2
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Post by billypurves Sun Mar 08 2015, 18:59

Hi Ally, Have you had the needle valve out?
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Post by Ally's_Engines Sun Mar 08 2015, 21:49

I took it out in the past to replace two coppor washers but not just now.

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Post by callum12 Mon Mar 09 2015, 00:16

try turning the mixture dial round one more turn, then check the valve that the float is attached to, if that is corroded then it will allow fuel to keep on flowing through even when the bowl is full.
Callum

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Post by Darryl Ovens Mon Mar 09 2015, 03:12

If the float is hollow brass or steel they can sometimes leak and part fill with petrol.  Result is the fuel level is too high.
To check take the float out and shake it near your ear, can you hear or feel fuel sloshing around inside it, it is leaking.  Repair is replace or somehow get the fuel out then plug the hole.  Remember if it has a trace of fuel in it, it is a little bomb, so don't use a flame based soldering iron etc.   Shocked     Embarassed

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Post by Ally's_Engines Mon Mar 09 2015, 08:26

Thanks for the advice, I'll go and check all these. Smile

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Post by billypurves Mon Mar 09 2015, 20:52

Ally, You need to slacken off the air valve at the front of your carb. Easiest way to do it is......take off the three screws or nuts that hold on the brass valve retainer and put in a shorter spring or cut the spring that is in there.

It sounds to me that the engine has too much choke...over fuelling. Not tonight though or you will be blown away!!!

Billy.
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Post by Ally's_Engines Wed Mar 11 2015, 17:51

Thanks Billy Smile

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