I'll use a 1034 concentric on my 600cc Comet project they don't leak and work very well, thank you, Monoblocs do work as well and doesn't look totally out of place like those hideous Mikunis. We are talking old British bikes here, I can't see the point of spoiling them with oriental stuff everywhere from disc brakes to forks, stands, clutches, frames, you name it. Everything on a Vincent or any other old Brit can be replaced by something far better from one Japanese manufacturer. Where do one stop? Why don't you ride a modern Japanese if you want modern behavior from your machine?
But we already had this talk before... Please note again that I build bitzas and I only use period Brit parts on them, I'm not a purist but in my opinion there is no excuse to denature any old Brit Bike, stock or period specials.
This is not specifically pointed at you Glen, your mighty Egli is something else built from new parts as far as I know.
Eric
The bike in the photo is ported to 35 mm.
I probably should have 36 mm carbs on there but the 34s work quite well.
A few years ago I considered switching to Concentrics but 32 was the largest available at that time without going to MK2, which look much the same as the Mikunis but are lower in quality.
I don't mind the Concentrics but you have to know there are people who despise them as strongly as you do the Mikunis.
I knew one very good Brit engine builder and Daytona racer who insisted that all Concentrics should be removed from the bike then driven over and crushed with a large truck so that they would never be used again.
They see them as cheap, low quality carbs that showed up as the British motorcycle industry was in its death throes.
There is some truth to that, the original Concentrics were an extremely short term, throwaway carb. The Monoblocs I've seen also had the same problem of very fast slide and body wear. They appear to be of the same monkey metal as the lowly Concentrics.
The Mikunis with their heavy chrome over brass slide are a much higher quality item, can't ignore it.
So it's interesting to see someone get worked up about something as low end and forgettable as the old Concentric carb! $750 US for a 1034, is that correct?
Seems a lot for a throwaway carb that is not original to any Vincent. The 1034 I'm seeing is NOS at Baxter's and it appears that you get all of the original Concentrics issues for that price, fast wearing slide, bad pilot jets design, iffy float.
I do think the new Premieres are quite good and aren't overpriced. Unfortunately there have been some quality control issues with them.
I'm having good luck so far with a set of the Premieres. I wish they were available in larger sizes
Everyone has an opinion, in the end the owner runs whatever works for him/her.
I run Dellorto 41mm pumpers on the 1360 solely because that's the carb Terry Prince suggested. They work extremely well with that engine. I just used the jetting he suggested and it was bang on. Tried going up and down from there, but ended up back at the original jetting.
The surprising thing is that it gets 60 mpg on a 70mph cruise. 70mph is just off idle on that bike, so I guess it's still running on the pilot jets.