PhilW 396 Posted July 17 Report Share Posted July 17 Hi, Went on a drive to visit someone last night. Car seems to be running OK. Went past a lorry so hammered it a bit and the engine began to falter. Engine appeared to be running and i dont believe I was one pot down based on sound and relative smoothness of engine. Got to the point where I could barely move. As soon as I lifted the clutch the engine dropped off and no power. Got to a safe place, stopped the engine, restarted after only 30 seconds and was fine. Continued journey and drove home probably totaling a further 25 miles or so with no issue but did remain at about 50 mph. Had a suggestion that possibly the fuel regulator is playing up and over fueling the carbs. As speed increases it allows additional fuel but doesnt cut back as I slow down but then recovers if I stop. Looking at the exhaust it appears to be running a bit rich but any other suggestions? Much appreciated. Quote Link to post Share on other sites
jonwat 344 Posted July 17 Report Share Posted July 17 Carbs incorrectly mounted causing fuel frothing at higher RPMs? Quote Cheers, John W http://jonwatkins.co.uk Link to post Share on other sites
PhilW 396 Posted July 17 Author Report Share Posted July 17 How do mean Jon. Incorrectly mounted. you mean where its bolted to the inlet manifold. There are alluminium spacers and large O rings. All been renewed by me but checked by GST Quote Link to post Share on other sites
jonwat 344 Posted July 17 Report Share Posted July 17 The O rings are there to absorb the engine vibrations which would shake the carbs & cause the fuel in the float chambers to froth, causing irregular high speed running if the mounting nuts have be over tightened, over compressing the O rings. Only people that don't know this over tighten them so I'm sure it's not your problem. Good luck finding the solution. Quote Cheers, John W http://jonwatkins.co.uk Link to post Share on other sites
drdoom 327 Posted July 17 Report Share Posted July 17 I'd look for trouble in the fuel delivery, as you have proposed Phil. Quote Link to post Share on other sites
Buddsy 1,550 Posted July 18 Report Share Posted July 18 I had a few similar issues before my fuel pump died. It was working but in the end didnt have enough power to lift the fuel, so you could hear it running but was just old and gutless. Our pumps have to work quite hard to maintain enough pressure and they are quite pricey too but you have to have the correct one to supply the pressure required. buddsy Quote "Belief is the enemy of knowing" - Crrow777 Link to post Share on other sites
PhilW 396 Posted July 24 Author Report Share Posted July 24 Well gone back to it today as have been away. Found excess cable on the choke where it connects to the carbs was catching on the plenum chamber section that sits over the top of the carbs. That was the excess revs and small amount of popping while idle. Didnt have time for a run but am hoping that may have fixed the other issue. Choke was on all the time. Quote Link to post Share on other sites
NigelM 61 Posted July 24 Report Share Posted July 24 Glad it was a simple fix. Fingers crossed it's solved. Had been following this as I have a stutter when putting the foot down from 2000 rpm, clears up by 2500 and beautiful after that, but as I don't have the choke connected your solution doesn't solve my problem 1 Quote Link to post Share on other sites
ChrisJ 1,374 Posted July 24 Report Share Posted July 24 @NigelM that'll be most likely changeover from the idle jet to the main jet Sample topic One day I suddenly had an issue that I couldn't pull away from a petrol station unless I really revved the engine over 2500 rpm. Was advised that I might have water on the carb (not a technical term) and that I should just heat soak the engine to get rid of it by running up to temp on the drive until the fans cut in, let this happen a couple of times and it would go away. Did this, and it cured it. Quote Link to post Share on other sites
NigelM 61 Posted July 24 Report Share Posted July 24 Thanks #ChrisJ - very helpful Quote Link to post Share on other sites
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