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The Beige BX Progress Thread: 25/3 Carb rebuild

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I'd suggest ordering some from chevronics, but last time I tried to buy something from them they'd sold out months previously and never updated their website, hence a refund and no parts. Also I'm pretty sure Rob Moss is a UKIPer so probably best avoided if at all possible

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14 minutes ago, barrett said:

I'd suggest ordering some from chevronics, but last time I tried to buy something from them they'd sold out months previously and never updated their website, hence a refund and no parts. Also I'm pretty sure Rob Moss is a UKIPer so probably best avoided if at all possible


I see. The ones on my car came from Chevronics... I'll order some from them, I think.

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So... last week djimbob and I finally found time and braved the cold to cast an eye over the old beige. I've had a dizzy cap in the garage for months to replace the knackered one on the car. Our mission was to fit that, measure up for a new set of HT leads and find the model number on the carb so that I could order a repair kit.


The bad news is that the car doesn't like being kept outside - the door seals are as bad as the ones on my car and consequently we found it full of water and smelling pretty rank. djimbob did sterling work cleaning the mould off everything and baling out the footwells... we'll be keeping a tarp over it after this.




The better news was that it started - and idled! - with the new dizzy cap on. If you cast your mind back to the earlier pages of this thread idling was never its strong suit. Well, now it does... a bit rough, but idling nevertheless. More bad news followed, though, by dent of the fact that the misfire is still there higher up the rev range. No matter... onwards and upwards. I measured the leads and scored a NOS set of BOSCH ones off eBay. The old ones are very hard and cracked, and are possibly original. The little metal tag on the carb betrayed the model:




and from that it was easy to order up a repair kit from Germany. I'm pretty sure we talked about replacing the plugs (@KruJoe?) but never did, so I ordered a set of those too.


Full disclosure: when Dan StillOrange bestowed keeperhood of the car upon me, he also bunged me the remaining £80 in the car's kitty for buying precious things. The gallon of fuel was on me, but I have spent:

- £25.22 on a carb repair kit

- £12.00 on the new HT leads

- £4 on a set of new spark plugs

which leaves £38.78 in the pot. Just so you know.


EDIT: £4 for bogus plugs refunded  I bought another set from GSF - £13.07

So now there's £29.71 left.


Everything but the plugs have arrived, and it is hoped that these will turn up in time for us to fit all of the above on one of my days off next week. In an ideal world this would result in bye bye misfire, and if we're that lucky, then we'll take it to djimbob's tame MOT tester and see how it goes.


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I'm determined to keep the momentum going on this, but it seems that there's a bit of inclement weather doing the rounds, or something. On the plus side, the car's pile of Precious Things have arrived, so we're ready to have at it again once it stops blowing a bastard gale:




I remembered on one of the last times we met up at Castle_Cleland we discovered a split steering rack gaiter. Those ones are from my car's spares stash, hopefully they're going to be the same... you never know!


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So, today @djimbob and I did have at it again.


First off, new spark plugs. What are the gaps? Fuck knows, and the interweb reveals nothing remotely useful, so we text the ever-obliging @Cleon-Fonte (who is busy elsewhere with his own problems). Much later, we discover the not one, but two HBOLs in the boot, along with the jack and about 11 hubcaps...


We have great difficulty getting the plugs out of the head, because our plug spanners are either too short to reach the hex bit of the plug, or are the length of the Iraqi Supergun and thus impossible to deploy thanks to the orientation of the suitcase engine. After some thought, Jim goes to the garage, and returns with a big fuck off reciprocating saw...




With great precision*, he lobs one of the plug spanners in half, beats one end flat with his best hammer and proceeds to drill a hole through the flat end. Sorted! We remove the plugs, and replace them with the new ones, after gapping them and attaching the big extension things that allow them to sit so low in the head. The old ones, while very sooty, don't look that bad. On to the HT leads. The set of leads - so carefully identified by number as being the the correct set - bear no resemblance to the ones on the car. Outstanding. The rubber boot things on the dizzy cap ends are completely different, and we have to swap these over to make the new ones fit. The coil lead supplied was about 3" long, with the wrong plug on both ends, so we'll have to buy another one to replace that with.


All this done - and a ropey looking low tension connector to the coil replaced - we fired her up. It started quickly, and idled quite well, if a bit fast. Once warmed up, we tried revving it and, to our dismay, the misfiring is still present. Mucho coughing and farting. Bastard.


Much as I enjoy the man's programmes, I didn't feel like rebuilding the carb Keith Floyd-style on a trestle table in Jim's yard (although by this time, a large glass of red might well have been welcomed). So, off it came and into the boot of the BX it went. It's on the bench in my garage at the moment, with all the screw heads soaking in penetrating fluid in anticipation of my attacking it, hopefully next week.


I really hope rebuilding the old Solex cures the problem, because we're all out of ideas if it doesn't.




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21 minutes ago, vulgalour said:

If your misfire is a lack of fuel rather than a lack of spark could it be a sticky carb component or a weak fuel pump diaphragm?  Perhaps both.


The pump was something we spent a lot of time on when it was at @KruJoe's place, and it seems to deliver plenty of the good stuff up to that point. I have bought a rebuild kit for the carb, and that's the next action. If that doesn't work, then we'll be throwing the floor open to anyone with ideas!


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Sorry I couldn't make it over today, I was dishing out abuse to spark plug spanners with you in spirit. The whole plug lead saga sounds like a fucking nightmare.

Hopefully a carb rebuild sorts things, considering the terrible reputation with which old Solexes suffer I've found that you can usually swap out anything that could potentially cause trouble and parts availability for these BX carbs appears to be good. High idle does sound like it's out of adjustment which won't be helping.


3 hours ago, Dave_Q said:

I hear @Cleon-Fonte has got loads of old Solexs now, one of them will surely fit ?

Cause the French were always quite good at making things interchangable.



All we need to do to instantly solve our running issues is swap this BX for a 1970s small Renault, then we'd have a lifetime supply of new carbs (along with a lifetime supply of ferric oxide, probably). Amazingly the French managed to make them relatively non-interchangeable even with an identical engine, much as I'd love the BX to serve as a dumping ground for my excess Solexes.

If only we were in Bordeaux and could pop to the Solex shop in town to get it sorted.





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It'll be a while before I get to fit it to the car, but I have time on my hands so the carb got rebuilt today






This little diaphagm thing was the worst bit I found, see the daylight through it?




This was also shot, but there was no replacement in the kit:




I improvised with three little O-rings crushed together. Not perfect, but better than what we had.






All done!




Let's hope it does the job!


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