Tuesday, 30 June 2020

Jimmy Guthrie. 1937 Assen TT

-JdK- Jimmy at the start of the 500cc, discussing with Freddy Frith. Karl Gall and his BMW on the left. Guthrie retired, Karl won the race.

Monday, 22 June 2020

CS1 cylinder head identification

-JdK- Steve in York sent this mail: "Back in 2018 I bought these two cylinder heads at a small auction. I specifically wanted the Model 18 head for an engine build but the CS1 head was always intended to be passed on at some time. The head however has casting number BE2497 clearly cast into it near the inlet. I wondered if this number was significant? All other standard looking CS1 heads I have seen carry number B411 ? Additionally when they were collected I noticed that there was a slug of Aluminium stuck in the exhaust port. Now I know early race heads had overheating issues and my vivid imagination considered wether this had perhaps happened half way between Ramsey hairpin and the Gooseneck?

Anyway I'd like to identify the head and subsequently it would be available ideally to swap for an early pre 1925 model 18 head or a primary chaincase? Anyone know the significance of the number?

Additionally, the cylinder on my Model 18 was at some point sleeved and I was worried how thin this made the bottom flange particularly, I also have two other bikes with wrecked cylinders so have had a pattern made and some new castings produced. Pistons were produced by Omega with two compression rings and their own one piece low tension scraper ring.

I will likely have a few spares if anyone is interested preferably for swaps for other parts for my 1924 to 1931 projects?"

Saturday, 20 June 2020

Push Rod return spring base - for sale

-JdK- Leon sent this message: "Having No luck finding any push rods to complete projects, so I commissioned an engineering firm to make some of the return spring base cups using a copy of the push rods from my 1927 Model 18. The rest of the push rod I've made up using later Norton top cups (even some BSA is close) on a length of thin wall 3/8” chrome molly. I have had some extra made and can have more made should the demand be there. The photo shows the push rod and one cup on the left which are original and the four new cups on the right. Price is $71.50  AU each plus Postage."

Tuesday, 16 June 2020

c1927 Model 16H Norton

-SG- Our good friend Viktor has just sent the slightly edited message below - good to hear the bike's owner is not planning a major restoration. I don't have access at present to the despatch records to double check but it looks to date from late '27 or early '28.

"Today I visited my friend Paul (who is involved in a 17C project).  There was a big surprise waiting for me - he has bought an almost complete 16H project. Minor changes in its life are that the ignition system is now via a magdyno of French origin, mounted on a bracket for an ML magneto. The headlight is missing and the carburettor has been replaced by a Jikov type as used on some more recent Jawa models.  An interesting design is the fuel filler neck and filler cap - it seems from the intact painting that it is an original design with a thread. (My view is that the original Best  and Lloyd cap and neck have been replaced at some stage!! SG)

Paul is very happy with his new acquisition and intends to keep the machine in authentic condition. The machine will be disassembled and cleaned. The mudguards will have dents etc removed and and be sensitively repainted."

Martin has looked more carefully than I did at Viktor's photos and has sent us the message below.

"Hi guys, just a comment re the new discovery 16H which Viktor reports.  I agree with Simon: the petrol cap is a replacement, possibly off a farm implement, but definitely it didn't leave Norton's factory like that.  

And surely the barrel isn't 16H either, as the finning is all wrong, and it has a strange boss on the lower rear face of the cylinder with a large plug blocking a presumably threaded hole.  I have a similar 79mm bore sidevalve barrel which looks like this one and is definitely not Norton. I had suspected it was Raleigh but no-one has yet come up with a proper identification."

Saturday, 13 June 2020

Henry Williamson and his Nortons

Regular contributor Martin writes "My passion for belt drive Nortons was sparked as a youngster when i read references to them in Henry Williamson's wonderful novel Tarka the Otter ... (read the whole story by pushing this link)

Wednesday, 3 June 2020

1927 Model 18 Norton

-JdK- This is the next reincarnation of my 1927 Model 18. I have fitted old - original mudguards and a Terry saddle. Still with the biggest Norton flat tank ever made.

Sunday, 31 May 2020

1935 International Norton

-JdK- John in Melbourne had some extended  shed time in the last 2 months which resulted in getting his Inter together. Photo shows how he acquired the frame in 2003, then gathered parts to complete over a few years.

Sunday, 10 May 2020

Replica parts for '20s Nortons

-SG- Tom has recently sent us photos of replica parts he has made for  '20s Nortons.  Anyone interested should contact Tom direct - his email address is pioneerbiker@gmail.com.  He also has available a 1929 ES2 barrel for sale or exchange.

Sunday, 3 May 2020

Special carburettor 2

-JdK- Ian sent us the following text and pictures: "Your recent feature on the final development of the Gardengate Nortons reminded me that I have some photos of the special carburettor. A couple of years ago David Crawford (author of the Stanley Woods biography) brought one of those carburettors to a club run so that we could take a closer look. The main advantage of this design seems to be that on full throttle the needle is withdrawn completely from the air flow through the venturi. 

David also found scans of two magazine articles which may be of interest. From "Motor Cycling" June 16 1949. This includes a short piece on the carburettor fitted to Artie Bell's machine. From "The Classic Motorcycle" September 1991. Rex McCandless interview with Joe Wood "My Biggest Mistake"". For a large version of the scans right-click your mouse on the pictures and choose 'Open in new window'.

Saturday, 2 May 2020

Binks booklet 1927

-SG- Alan has just sent this scan of the 1927 Binks booklet - possible one of the last published before the merger with Amac/B and B.  May be useful to CS1/ES2 owners!

The copy attached has been prepared on the basis of copies of the individual pages, but for practicality purposes a couple of double page spreads are included after the end of the booklet. Thanks Alan!