dollywobbler Posted April 1, 2018 Author Share Posted April 1, 2018 Had another run out this morning. Well, it was such a lovely day I just had to. That's TWC having a well deserved rest after hitting the dizzy heights of 60mph! The good news is that the oil seems to be mostly staying inside the engine now, and the oil pressure light is mostly behaving. There was one point when it flashed on at idle, but then it went away again. Odd. That was before our speed record attempt. The bad news is that the magic potion I added to the fuel has done absolutely piss all. I'm still getting massive bogging under throttle application at times, which clears if I either pull in, select neutral and give the engine a few revs, or if she goes 'Tuk!' and then she pulls cleanly again. So, I think it's approaching time to park her up for a bit and properly investigate. I also need to look at the master cylinder, as doing 60mph in an 'unsafe' trike with iffy brakes is pretty stupid. Skizzer, oldcars, Scruffy Bodger and 10 others 13 Link to comment Share on other sites More sharing options...
purplebargeken Posted April 1, 2018 Share Posted April 1, 2018 Fab little thing. Link to comment Share on other sites More sharing options...
jbz2079 Posted April 1, 2018 Share Posted April 1, 2018 Could the carburettor problem be as simple as water in the float bowl?Classic symptom is the "TUK" spit back as it goes weak the pressure in the inlet blows the water back from the main jet and off it goes, till next time. Link to comment Share on other sites More sharing options...
dollywobbler Posted April 1, 2018 Author Share Posted April 1, 2018 Could the carburettor problem be as simple as water in the float bowl?Classic symptom is the "TUK" spit back as it goes weak the pressure in the inlet blows the water back from the main jet and off it goes, till next time. Pretty sure not. I've emptied the float bowl several times, and the fuel tank was absolutely dry before I put fresh fuel in. Probably won't get time to tinker for a week or two. Also, there's still a sodding oil leak. I think it might be from one of the tubes that goes from rocker cover to the block. Link to comment Share on other sites More sharing options...
mat_the_cat Posted April 1, 2018 Share Posted April 1, 2018 I love this picture - the promise of spring around the corner, and a summer of Invacar motoring ahead of you dollywobbler 1 Link to comment Share on other sites More sharing options...
dollywobbler Posted April 1, 2018 Author Share Posted April 1, 2018 Aye. Once I pull the sodding carb off and find out what's wrong with the sodding thing. And cure the oil leak that hasn't gone away. And stop the brakes pissing fluid everywhere. And fit some sound deadening... It's been relegated to the back of the garage again now... Link to comment Share on other sites More sharing options...
DodgeRover Posted April 1, 2018 Share Posted April 1, 2018 Have you checked the valve clearances? Link to comment Share on other sites More sharing options...
Squire_Dawson Posted April 1, 2018 Share Posted April 1, 2018 What carb does it use, could it require some damping like the SU. Or else if it has a diaphragm could it be split and there be an air leak somewhere causing it to weaken and cut out under load. Scruffy Bodger 1 Link to comment Share on other sites More sharing options...
dollywobbler Posted April 1, 2018 Author Share Posted April 1, 2018 Have you checked the valve clearances? Yes. Spot on. Link to comment Share on other sites More sharing options...
dollywobbler Posted April 1, 2018 Author Share Posted April 1, 2018 What carb does it use, could it require some damping like the SU. Or else if it has a diaphragm could it be split and there be an air leak somewhere causing it to weaken and cut out under load. Single choke Solex 40 PID I think. I have no idea how it works really. Link to comment Share on other sites More sharing options...
The Reverend Bluejeans Posted April 1, 2018 Share Posted April 1, 2018 hitting the dizzy heights of 60mph! Jesus, I had a moment of cold sweat just imagining that. Link to comment Share on other sites More sharing options...
LightBulbFun Posted April 1, 2018 Share Posted April 1, 2018 That's TWC having a well deserved rest after hitting the dizzy heights of 60mph! I think the saying everyone is looking for is: Brass balls so how did it handle at 60Mph then? Link to comment Share on other sites More sharing options...
dollywobbler Posted April 2, 2018 Author Share Posted April 2, 2018 It was fine actually, but you have to be ridiculously precise with steering inputs. Lock to lock involves about six inches of travel, so it is terrifyingly direct. GrumpiusMaximus, purplebargeken, Lacquer Peel and 3 others 6 Link to comment Share on other sites More sharing options...
adw1977 Posted April 2, 2018 Share Posted April 2, 2018 It was fine actually, but you have to be ridiculously precise with steering inputs. Lock to lock involves about six inches of travel, so it is terrifyingly direct.Sneezing at 60mph not recommended, then? madrat 1 Link to comment Share on other sites More sharing options...
dollywobbler Posted April 2, 2018 Author Share Posted April 2, 2018 Sneezing at 60mph not recommended, then? Frankly, sneezing at 20mph is pretty risky. GrumpiusMaximus, adw1977, They_all_do_that_sir and 1 other 4 Link to comment Share on other sites More sharing options...
red5 Posted April 2, 2018 Share Posted April 2, 2018 Great stuff - my late grandads friend/work colleague had one. Fascinated me - I got to have a go as a 'passenger' round a Midland Red workshop. Exhilaration and terror in equal measures. Re: the random carburation - does it play up if you slowly apply throttle, or just on initial 0 - 50+% opening? Sam Link to comment Share on other sites More sharing options...
dollywobbler Posted April 2, 2018 Author Share Posted April 2, 2018 Great stuff - my late grandads friend/work colleague had one. Fascinated me - I got to have a go as a 'passenger' round a Midland Red workshop. Exhilaration and terror in equal measures. Re: the random carburation - does it play up if you slowly apply throttle, or just on initial 0 - 50+% opening? Sam Will have a new video up soon which demonstrates it well. Generally, it's after a dose of full throttle, you come off, then re-apply and find there's nothing. Sometimes she coughs and then runs fine, sometimes you have to stop, knock it into neutral and rev the engine, then it's fine. It is quite baffling. Link to comment Share on other sites More sharing options...
Noel Tidybeard Posted April 2, 2018 Share Posted April 2, 2018 that almost sounds like the accelerator pump on the carb is intermittent in operation richardthestag 1 Link to comment Share on other sites More sharing options...
red5 Posted April 2, 2018 Share Posted April 2, 2018 That's what I suspect... Either hole in diaphragm or crud behind it. Can you see down carb relatively easily? The tube from the acc pump should exit into venturi beneath the choke flap and above the throttle flap - relatively easy to see if a rapid opening of the carb results in a uninterrupted 'squirt' onto throttle flap. No engine running required Although a full-ish float chamber is needed for obvious reasons.... Link to comment Share on other sites More sharing options...
red5 Posted April 2, 2018 Share Posted April 2, 2018 No. 40 and 28/29. Apologies if it's teaching you to suck eggs chap. Link to comment Share on other sites More sharing options...
dollywobbler Posted April 2, 2018 Author Share Posted April 2, 2018 Accelerator pump is working fine. In fact, when it loses power, it's only the accelerator pump that keeps me going (cue much frantic wrist action, oo-er...) madrat and cpjitservices 2 Link to comment Share on other sites More sharing options...
red5 Posted April 2, 2018 Share Posted April 2, 2018 Hahha, spat my tea out.... Float level ? - or needle valve sticking? madrat 1 Link to comment Share on other sites More sharing options...
dollywobbler Posted April 2, 2018 Author Share Posted April 2, 2018 Could be. Can't say I really understand enough about them to know how to check. Will be getting the carburettor apart again at some point, but probably not for at least a week. Link to comment Share on other sites More sharing options...
madrat Posted April 2, 2018 Share Posted April 2, 2018 I would do a full carb re build Squire_Dawson 1 Link to comment Share on other sites More sharing options...
dollywobbler Posted April 2, 2018 Author Share Posted April 2, 2018 More video, more speed. The Moog, AMC Rebel, oldcars and 7 others 10 Link to comment Share on other sites More sharing options...
plasticvandan Posted April 2, 2018 Share Posted April 2, 2018 Assuming flow to carb is OK,I would say the float level is too low,and its shutting off too early.Similar carb as that used on Regals, I used to have a cutting out problem due to the carb flooding internally due to the top cover gasket not sealing properly. Link to comment Share on other sites More sharing options...
Coprolalia Posted April 2, 2018 Share Posted April 2, 2018 Stupid question probably answered or considered previously, but what state is the carb on TWC's original engine in? Link to comment Share on other sites More sharing options...
red5 Posted April 2, 2018 Share Posted April 2, 2018 The symptoms seem to indicate a sticky float needle valve. Sticking open when you come off the throttle. Maybe? Ben Sticking closed I suspect - open would flood it/leak like a sieve. Link to comment Share on other sites More sharing options...
dollywobbler Posted April 3, 2018 Author Share Posted April 3, 2018 The symptoms seem to indicate a sticky float needle valve. Sticking open when you come off the throttle. Maybe? Ben If it was doing that, I wouldn't expect a swift cough to clear it. Not that I'm an expert on carbs. Stupid question probably answered or considered previously, but what state is the carb on TWC's original engine in? Sadly, the spare carb was already missing its top and had been open to the elements, so not much cop. Link to comment Share on other sites More sharing options...
AndySnapper Posted April 3, 2018 Share Posted April 3, 2018 Fuel starvation slightly overcome when you blip the throttle, then clearing after a short break to let the crap (wherever it is) settle and start over again? Does it have a clean fuel filter in-line? I presume the fuel line has been replaced so no splits or leaks? You say there is petrol around the outside of the carb? This is especially worrying given the tendency for these vehicles to catch fire back in the day. Stripping the carb and re-building is pretty specialist I bet (last resort). What about the air filter blocking flow? I don't envy your job to find the cause DW but do wish you all the best. Andy Link to comment Share on other sites More sharing options...
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