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Carb from a guy called Stagman29 on eBay. Conversion kit from HNJ engineering https://www.hnjengineering.co.uk/pages/products/hnj2286su4cyl/hnj2286su4cyl.html About £700 all in.

So, just got a refurbed 1 3/4” SU on and she’s purring like a kitten. Obviously got a bit of cable and plumbing tidying to do! Olly

Ongoing. I picked up an adaptor elbow from HNJ engineering. Got an HIF44 carb although throttle mechanical looks to be reversed. Broke a stud in my exhaust manifold so need to extract that… then we’ll see!

As an update just in case anyone stumbles on this, I’ve given up on the Weber DTML and decided to fit an SU.

very good point, thank you. I don’t have such a meter but I can get it hot and test the spark.

I haven’t had much time for tinkering of late, but my next tasks are to fit an exhaust heat shield … of course it looks like the series 2.25 part, which I have, won’t fit the 2.5 manifolds with which mine is fitted … interestingly they came with a carb spacer from the factory to insulate against...

thanks. I just checked mine and it looks right, only the position of one of the return top tube appears a little inboard on my unit.

Aye, that’s what one of the solenoids is for - when it doesn’t get 12v it opens and vents the bowl… (haven’t tested it yet as I’m away) however that problem shouldn’t arise while the engine’s running as it’s constantly drawing fresh fuel into the bowl and through?

Would you mind expanding on this? Issue how so? As in spilling over the float bowl?

Thanks to all contributors so far. Your support much appreciated! I will crack this! thinking aloud, 8mm fuel line to the carb might help too, as there’d be a greater volume of fuel to heat. It’s currently 6mm.

Huge thanks for this. I haven’t checked the solenoids, or done everything possible yet to reduce heat soak. Carb spacer was a start but heat shield would help too.

It didn’t have either of them when I got it, but same hot running problems

that’s my gut feel, but I’ve spent £s and time trying to get this setup right. Runs so sweet when cool.

electric

I fitted it, as these carbs are supposed to have it and are are susceptible to vapour lock without it, but it doesn’t seem to have helped.

As in visually see if the throttles fully open?

hi, it’s a swirl pot. / vapour separator. It has a return line to the tank. As used on the 2.5na lump which has this carb

Hiya all. My 1980 petrol came to me with a Weber 32/34 DTML and has always suffered difficult starting when hot. I’ve done the following to try to sort it: - carb rebuild inc new float, cleared crap out of jets, ran better for a bit (but still trouble when hot) - set float height to 7mm -...