The Purpose of This Blog.
The blog will be divided into three parts:
- To detail the known HISTORY of Vincent HRD Grey Flash 2751.
- To ascertain what PARTS were original and to source missing parts.
- To record the RESTORATION of this important racing motorcycle to as close to Works Record Card specification as possible whilst retaining period modifications from the bike’s racing past.
NOTE: scroll down to start reading the History section.
Grey Flash 2751 (the engine number) is one of approximately 33 of this model constructed and it is the third production machine after the ‘Eppynt Comet Racer’ (2734) and the Earl’s Court show model (2750). I said ’33’ though two of the last bikes were converted to road trim and two left The Works as engines only so the real number of fully assembled racers was likely closer to 28.
The Vincent Owners Club holds most of the original production records:
This fascinating document gives a very detailed record of the exact specification the bike left the Stevenage factory with, who was involved in its assembly and testing and where it was shipped to.
We know it was ordered, by letter, by New Zealander Geoff Weston Webb on the 29th August 1949. At that time, Weston Webb, of Auckland, was the NZ agent for Vincent HRD. Geoff had also apparently traveled to the UK and would have seen the show model Grey Flash on display at the Earl’s Court Motorcycle Show on 21st October 1949.
Several entries in this document are worthy of note and will be covered in detail later on in the blog:
- The forks are listed as ‘Girdraulic Anodized’.
- The magneto is listed as ‘Lucas Racing Manual Control’.
- The Carburettor as a 32mm Amal.
- The fuel tank as being ‘Dull Chrome’.
A ‘final speed test’ was undertaken by the legendary George Brown and the finished machine passed by: Dennis Minnet (head of the Special Engine Dept.), C. J. Williams (racer and Works Development rider) and George Brown.
The Denis Minett Notebook
Denis Minett was in charge of the Special Engine Dept. at the Stevenage factory. Denis maintained a notebook listing details of all racing Vincent HRD motorcycles and racing engine units supplied to customers. The DM Notebook is difficult to come by as, in the wrong hands, it would provide invaluable data for counterfeiters to work with.
2751 has three pages devoted to it in the notes – this is rather a lot and points to the prototype status of this, the third production Grey Flash. Most entries are limited to a few lines recording date, engine/frame numbers and outlining specification.
So, here’s a transcript:
Engine #: F5AB/2B/2751
Frame #: RC/1A/4651
Weston Webb, NZ
63cc 8.9:1 (CR)
56/69 (inlet opens/closes) 78/51 (exhaust opens/closes)
mag 35° → now 39°
Points increased (opened up .002”)
No 8 slide
450 main jet
109 needle jet
NA10 spark plugs
1st test run 62 miles
2nd test run 39 miles
3rd test run 60 miles
Taken to Gransden and ridden by C.J.W. (Jack Williams raced in IOM Senior prewar on Vincents and worked as a tester post war – did most of the testing of the prototype Black Shadow). Top ratio 5.07:1. low 50-tooth sprocket up and down main runway. Strong wind blowing:
105mph @ 6,200rpm – with wind.
95mph @ 5,800rpm – against wind.
90mph in 3rd (6:1 ratio) at supposed 6,000rpm on counter.
Top ratio 4.66:1 with 46 tooth rear wheel sprocket – 107mph.
The rev counter was eventually considered to be unserviceable and speeds taken are as given by speedo.
Taken out and tested by G. Brown on 08.11.49 at Gransden – 31 miles. NA12 spark plugs used.
As ridden by C.J.W. was found to be too weak and pinking on 450 main jet, after being run until motor was at nice running heat. Then fitted with 520 main jet and a definite increase in RPM was noticed. Fitted with 500 jet. Increase in max speed by 1.5mph and reaches this max quicker.
106/7mph against wind and still increasing.
112mph with wind. This wind was half side, half head.
Riding around perimeter a speed of 115mph was attained in top. During previous test run today it went up to 102mph in 3rd at 6,500rpm approx.
A short test was made using at (sic) 75/25 petrol/benzol mixture fuel, using the same jets as above. The speed came down to a mean of 108.5mph. No time was available to reach optimum jet sizes. It was also pinking – mostly low power. A 47 tooth rear sprocket is suggested for this course.
It was found that the engine will stand being taken up to 7,200rpm without undue stress and was being regularly taken up to 6,500rpm – at the same time being perfectly happy at these revs. For this particular engine at Gransden, a 47-tooth rear wheel sprocket would be considered to be the best on this particular day.
The optimum settings on this day were:-
500 main jet
NA12 spark plug
46-tooth rear wheel sprocket
No 8 slide
The engine was top stripped and all parts were found to be in A1 condition (the plug could come down another half thread). It is the opinion of G. Brown that this machine is about the average that can be expected until further experimental and research work is done on this type of engine.
Mean average speed on 50/50 – 109.5mph
The crated bike left The Works on the 11th November 1949 and was shipped to New Zealand aboard the SS Akaroa.
Raced Hard in New Zealand
Geoff Weston Webb did not ride the bike himself but sponsored several promising riders including one Len Perry who was later to marry Geoff’s daughter, become his son-in-law and eventually take over the business. On 2751 he led the NZ TT until the 10th (and second last) lap when the Rudge clutch fitted to it failed.
Len has a place in New Zealand’s motorcycling racing history, the details of which can be found here: https://www.mnz.co.nz/hall-of-fame/inductee/len-perry
The next three photographs were taken at the same location in succession. The captions have been mixed up though…
These images were sent to me by David White of NZ. They show 2751 in-period and confirm many aspects of the interesting specification of the bike. They are invaluable as reference and will be referred to during the restoration process. I’ve kept the best shot until last…
When I first saw this I had to sit down; it was a veritable ‘eureka’ moment for me. Not only can we clearly see which parts are dull chrome and anodized, but…
2751 features this script on the crankcases and timing cover whilst the fuel tank featured a ‘Vincent’ decal. 1949 was a year when The Vincent HRD company was in the process of re-branding and the HRD logo was dropped in favour of the Vincent scroll. It would appear that only the first 3 Grey Flashes featured ‘cases and covers cast with the HRD logo.
Grey Flash 2751 was raced extensively by Len Perry and with some success until 1953 when the following advertisement appeared in The New Zealand Motorcycle publication: ‘Vincent Grey Flash with £50 worth of racing spares, mileage under 1,000, guaranteed perfect – £275’
The motorcycle was sold, on HP, to an unknown man (supposedly a farmer). It was used and abused, though not on the racetrack. Some parts were removed (such as the kick-starterless Albion racing gearbox) but it would appear that the bike was far from suitable for use on anything other than the racetrack.
It was repossessed by Len Perry, when the farmer defaulted on HP payments, before being sold once again.
It was bought by William McCahon (possibly in 1964) who recognized its true importance. Bill McCahon was the son of celebrated artist Colin McCahon. He spent some 2 years gathering up the parts that had been removed from the bike. The original Albion gearbox was found under a house (the farmer?) and although looking sound was in poor condition. The original magneto was not to be found so was replaced with a Velocette BTH TT unit (rebuilt by one Fred Cooper). During work undertaken on the engine the original Vibrac conrod was found to be unserviceable and was given away to someone as a memento. The cylinder head was also deemed unserviceable and replaced.
(Bill Hoddinott 27.11.2018: The original cylinder head of the GF was an unpainted Black Lightning/Shadow front head with standard size but polished valves and the inlet port opened to 32mm to match the carburetor. It may have been sandblasted for the special finish rather than left as-cast. It cost the Works little to do that, except for the time to clean all the grit out of it, as well as the crankcase, cylinder and covers.)
During this period the “bones” of 2751 were witnessed by Vincent HRD enthusiast John von Tunzelman (27.11.2018): “It was almost certainly during 1969/70 that I met Bill McCahon (at his home in Grey Lynn) and saw the Flash. He welcomed my interest and showed me the Grey Flash in a dismantled state. I was interested to see the lightened Girdraulic legs with much material removed from the inner faces. All of the components were there and carefully stored. Len Perry had a son called Geoff who was a very talented race rider but was tragically killed in an air crash while flying over to the USA to race. The aircraft crashed while either landing or taking off on an island in the Pacific.”
2751 next changed hands in 1973 and passed to several owners before being sold by one Jim D. White in 1982, together with a genuine long range Montlhéry fuel tank, for $6,000. A copy of a very long list of parts included in the sale attests to just how much of 2751 remained together.
6.11.2019: Len Perry died in 2002 aged 90. Len and his wife, Jean, had a daughter named Dale whom I’d very much like to make contact with. If any reader of this blog is able to put me in touch with Dale I’d be much appreciated. Here is a wonderful 60 Minutes clip of Len taking to a race track for the last time in 1999 aged 87 with the great Agostini! This clip provides a wonderful insight into his character and also features his wife and Dale: https://www.youtube.com/watch?v=YyBeEDnsrvQ
Raced Hard in Australia
The buyer was Peter Johnson, a professional photographer, from Sydney, Australia.
Peter, working with Terry Prince, rebuilt the bike and it was started and ridden for the first time in many years at Yarramundi near Sydney during the 1983 VOC International Rally.
Peter raced and campaigned it for a number of seasons, first with the original motor and later on with a rebuilt Comet unit.
Much communication was exchanged with Peter Johnson regarding his time with 2751.
Peter Johnson 20.03.2013: “Good to hear your progress. The carb came with many other original parts, and I suspect/believe it is the original item. The manifold is cast iron… it was cracked when I got the bike, so we constructed a jig, re-welded it with cast iron rods and re-machined the clamp area to the correct diameter. I left it as plain cast iron, but suspect the previous owner has painted it silver to leave his mark – back to bare metal it should be. I actually had a wooden core machined in case the original cracked again – stlll have it, never recast any new ones. lasted because I only raced it for 2 years then rebuilt a comet engine with a GP2 using Terry Prince’s ideas… It flew… And Eric Debenham suggested the original Mk2 cam sounded flat, gave me one of his out of his Norvin, and the difference was light and day. Keeping up and passing long stroke Manxs was easy, but not short stroke models.”
Peter kindly sent me all the paperwork and photographs he had stored at his house; a considerable amount detailing his developing and racing of the bike.
Peter comments: “I fitted a Joe Hunt magneto from the US; reliable big spark, tuned length 2” exhaust – using the inlet I machined for the head (no nut) and a smaller front guard. Mac Read (a good friend from the UK) gave me old drawings for twin leading shoe brakes and Ken Phelps supplied me with a sheet of heavy Dural. I machined the backing plates, made all the pivot points from stainless, and Terry Prince made the actuating arms. They were very effective stoppers using 4 Vincent brake cams. The beautiful alloy tank was made in the UK. I also made a solid bridge for the front brake cable, with adjusters and did away with the brake beam. And I fitted a Norton clutch in place of the Albion unit. Later I attached the Amal GP2 carburettor from my Egli.”
During the five years that Peter fettled, developed and raced the bike it was widely featured in various publications:
The article is reproduced here and If any readers are able to point me in the right direction as to where to obtain permission, I’d be most grateful.
A similarly worded article also appeared in a Classic Bike special titled ‘Classic Racer’ in the winter of 1984/5.
Sold to Japan
2751 was later retired and restored to a standard-looking specification before being sold (via an ad’ in an 1989 edition of MPH (No.486)) to a gentleman I shall refer to as “Mr. K” from Tokyo.
As far as I know, Mr. K rode the bike for a few demonstration laps at Suzuka only. He did fettle the bike to his liking though, leaving his mark…
I bought 2751 from Mr. K in 2008 though unintentionally… It was a deal that looked set to sour after the buyer (whom I had introduced) had to back out of the agreement due to unforeseen circumstances necessitating my stepping in – so as not to cause Mr. K any aggravation.
What had I bought…? I knew the important numbers checked out but little else. This is what 2751 looked like when I acquired it:
After much calling around and email exchanges with marque authorities, I was able to breath a sigh of relief: what I had a acquired seemed to indeed be a genuine Grey Flash with many of the unique parts specific to this model still present.
In the next part of this blog I will be listing, with photographs, what I now owned. I will be documenting what was correct, incorrect and what parts I needed to try and find. I knew the search was not going to be an easy one – with only around 28 ever produced, locating original Vincent racing parts was going to be a challenge…