Expensive Solex carb

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Paul_Linden
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Expensive Solex carb

Postby Paul_Linden » Wed Apr 15, 2020 1:32 pm

A Solex carb for a Mark 1 square 4 sold recently on a well known auction website, final price £510. :o
Are they really worth that much or was this just a bubble?

1BDA8231-2255-48DA-A564-DAD1D5844158.jpeg
Ariel Square 4 mk2, Ariel Square 4 mk3 (yes, really), Ariel Colt, Matchless G12, BSA C12. Room for one more......

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Re: Expensive Solex carb

Postby paul.jameson » Wed Apr 15, 2020 8:36 pm

Just a bubble I think. One went on Ebay last year for well under £200 if I remember correctly.
Paul Jameson
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Paul_Linden
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Re: Expensive Solex carb

Postby Paul_Linden » Wed Apr 15, 2020 9:00 pm

I guess so, especially if two people who really want it get into a bidding war.
The solex I have is not from a Square 4 and the choke works in reverse (pull it out to turn the choke off). However, it works much better than the concentric I originally had on it, so I can wait until I find the correct Solex at a reasonable price.
Ariel Square 4 mk2, Ariel Square 4 mk3 (yes, really), Ariel Colt, Matchless G12, BSA C12. Room for one more......

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Re: Expensive Solex carb

Postby Pete.Silson » Thu Apr 16, 2020 11:46 am

The solex I have is not from a Square 4 and the choke works in reverse (pull it out to turn the choke off).

Paul -The choke mechanism on an AHD carb is reversible.

bistarter direction.jpg

The carb on the left In the picture pulls-on towards the left side (of the bike), the carb on the right pulls-on towards the right (as the SQ4 should). It is all to do with the relationship between the holes in the bistarter plate and the flats on the shaft. All you need to do is remove the bistarter valve plate and turn it the other way up and your choke will work as it should.

Pete

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Re: Expensive Solex carb

Postby Paul_Linden » Thu Apr 16, 2020 5:28 pm

Thanks Pete, I was wondering/hoping that this might be the case. I was, at the moment, just happy that I got it running!
Ariel Square 4 mk2, Ariel Square 4 mk3 (yes, really), Ariel Colt, Matchless G12, BSA C12. Room for one more......

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Re: Expensive Solex carb

Postby Pete.Silson » Thu Apr 16, 2020 5:45 pm

Paul

One thing I forgot to mention is to make sure that, when you put the plate back on, the two little notches on the edge of the other plate face towards the big cut-away hole in the valve plate (see right hand picture). I say this from personal experience of doing it wrong the first time.

Pete

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Re: Expensive Solex carb

Postby paul.jameson » Thu Apr 16, 2020 8:44 pm

I had a trip out on the 1937 Square today (for exercise, as its like riding a horse, riding a rigid Ariel because you have to take weight with your knees to avoid the bumps) and the bike is transformed after the carb modification suggested by Jens Beusse at the Annual Rally last year. So if you can get the Solex right it is a very good carb indeed.
Paul Jameson
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Re: Expensive Solex carb

Postby simon.holyfield » Fri Apr 17, 2020 12:02 am

What modification was that Paul?
cheers

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Re: Expensive Solex carb

Postby nevhunter » Fri Apr 17, 2020 4:12 am

With a 4 cyl motor the suction is very constant compared with a single so a throttle butterfly type carb is essential. The slide type tends to bind. The actual size of the bore of the carb can be quite small for the total engine displacement when you have 4 cylinders. The SU must have the needle centred to work well and the choke set up is difficult to adapt. Some other CV types might work or maybe a good lawnmower or small tractor one will work. Side draft solex may not be common. Most I know of are downdraft. Nev

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Re: Expensive Solex carb

Postby Akumar » Fri Apr 17, 2020 10:19 pm

Hi Paul,

What carb modification you made? Could you please share?
48' SQ4, 53' VB, 51' NH


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