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Post by farrier on May 9, 2022 19:38:12 GMT
I am having a problem with the engine only willing to run when the choke is fully out. As soon as I put the choke in ( even when warm ) the engine cuts out. Any help/suggestions would be much appreciated
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Post by Stiffy on May 9, 2022 22:26:07 GMT
You could check a couple of things - Have you tried adjusting the mixture screw ?. Is the flange warped and letting in air ?
Take the carb of the car and lay it on a shheet of glass. make sure its flat.
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Post by farrier on May 10, 2022 9:12:27 GMT
Thanks. Will try those
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Post by vannin on May 10, 2022 10:23:07 GMT
Also worth checking if you have an inline fuel filter and the condition of it if it's been on for yonks it could be partially blocked
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Post by farrier on May 10, 2022 17:55:24 GMT
Okay, but plenty of fuel comes through as long as the choke is pulled
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Post by cdb15 on May 10, 2022 18:09:03 GMT
Okay, but plenty of fuel comes through as long as the choke is pulled So insufficient fuel comes through when the choke is NOT pulled? So that says the fuel line up to the choke is OK, and the blockage in the fuel line must be within the carburettor itself. Most obvious thing is to take the carb apart and give it a thorough clean through. Also make sure nothing is broken or bent.
If you DO find lots of sludge, grit or other material in the carb that shouldn't be there, that says the in-line filter hasn't been doing its job. Why not? Obviously it's not blocked as the fuel flow is OK, but at the other extreme maybe it's ruptured, letting the grot through to the carb. Definitely worth checking and replacing if it's at all suspect.
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Post by farrier on May 10, 2022 21:27:34 GMT
Ok. I will check, thanks
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Post by farrier on Jun 27, 2022 13:27:13 GMT
Hi again. I eventually decided to buy another carb because we couldn't resolve the previous issues. The good news is that as soon as we put it in there was an immediate improvement and it starts up perfectly from cold and very quickly runs without the need for the choke. However, as soon as the temperature gauge moves towards 'normal', it starts to splutter and die. I have been told this sounds like overfuelling but I have no idea?  Any advice appreciated. |
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Post by cdb15 on Jun 27, 2022 14:51:38 GMT
Hi again. I eventually decided to buy another carb because we couldn't resolve the previous issues. The good news is that as soon as we put it in there was an immediate improvement and it starts up perfectly from cold and very quickly runs without the need for the choke. However, as soon as the temperature gauge moves towards 'normal', it starts to splutter and die. I have been told this sounds like overfuelling but I have no idea?  Any advice appreciated. I agree it sounds like you are now getting too much fuel coming through rather than too little! Life's never simple, is it?
First thing I'd do is check the plugs. If they are sooty, this confirms the engine is running too rich - and the very easy starting also points to this. So assuming everything else is on song - correct plug gaps, timing OK etc - then the thing to do is to weaken the mixture until you need the choke to start even in warm weather. The mixture screw on the carb will likely have enough adjustment to achieve proper running, but if not then you may need to change the needle or fit a smaller main jet, depending on what options you have with the carb you have fitted.
Once you think you've got the adjustment OK, run the engine for a few hours in total over several days and then check the plugs again. They should be grey-ish and the deposit hard and gritty to feel. There are loads of colour guides on the web to answer the question 'how can I tell how my engine is running', here's one but there are many others: www.motorcyclezombies.com/rebuild-tune-motorcycle/carbs-fuel-air/spark-plugs/ |
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Post by heartnut on Jul 11, 2022 14:21:40 GMT
This is probably not your issue, but I had an inexplicable running and dying issue that had me dismantling the carb over and over again, and it was completely cured with a new set of HT leads. The car would idle fine, but on demand for power and the engine would cut out. I don't know the science behind it, but apparently HT leads can decay with time.
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Any advice appreciated. 
Any advice appreciated. 
