The smaller tank from the mini or 200 frame will fit onto the standard 250 frame and in my opinion does look good espeacially with a purpose made aluminium seat . I have an original fibreglass tank from a Godden mini frame that fits lovely on my Godden 320 . My large tank from my 320 will fit straight onto a standard yam 250 frame. The large tank wont fit right on a 175 frame though and will restrict turning and around the seat area.
it is a thankless task and you really do have to take your hat off to them ! I remember back in the early days of Peak Classic about a decade ago bringing at times three observers with me ,all members of my family with the promise of a pub lunch afterwards , which actually became known as the Peak Classic drinking club. You know the culprits! They were really good days and epitomised why the classic scene which included twinshocks was a breath of fresh air in this area . If your honest though with the emergence of now three classic clubs using predominantly the same pockets of land who would want to observe three times a month in summer let alone in these conditions?
your right it is an alloy tank but its an aftermarket one I bought off a guy in north yorkshire last year, hes retired and with a small gang of mates he does quite a bit with british and twinshock bikes including frame alterations and fabrications.
The original one was fibreglass but sadly time and modern fuel took its toll and I had to have all the innards removed and a tank made to fit inside the original shape, thats on the shelf for a future project.
Thanks for that .HaHa yes we did have a moment first time out! Hes under strict instructions to throw himself under the bike in times of trouble . Il try and upload a photo of the bike before we restored her.
If you look closely at the end of the bars one of the grips has had a hard life.
To be honest the front brake isnt any better than the standard ty set up but the forks are! This set up is one I had on my C15 until I entered scotland ,its a pair of fantic 35mm stantions in ty 250 twsh sliders but as the brace lugs were damaged I had them machined off and an adjustable brace fitted and a lug to accept a KT front hub, the only bit of un-period parts are the yokes they came off my air cooled gasser .
Thanks , I was just browsing retro 80s yamaha paint jobs and I saw a Kenny Roberts bike, I thought it would be period and a bit different but staying close to the Yamaha DNA. Just the engine covers and brake plates to have done profesionally now
Hi, Does anyone know the factory carb settings, bike is running a Dellorto Phbl 26, bike seems very lumpy off the bottom to rich pilot jet me thinks . cheers
Yes, not sure which specialist did Mick's but it is modified. I've not ridden his but I've ridden another one which has similar mods and it was very goodThey only use parts from the correct period.
Mick's is a 310 (or at least it was originally, I think it still is rather than a 250) Head angle is steepened but I think it is just so they can use leading axle forks. Ossa steering is pretty good as standard but if you fit leading axle forks it spoils it. Hence I guess the angle change. Marzocchi forks and Grimeca front wheel. Rear swingarm from an MH349 Montesa which is longer and I guess to get back the wheelbase from steepening the head angle. Frame looks standard with even the older shock positioning rather han the later angled position. Different rear silencer which is probably straight through packed type rather than the original baffled type. Not sure if anything is done to the middle silencer but there isn't much room on an Ossa to alter it much. Longer front pipe like the later MK3 onwards bikes but a different shape. Rear wheel is Grimeca allowing for a rod operated back brake. The original MAR set up is a tortuous cross over spindle and cable affair.
Probably, the engine is ported to make it smoother and rev more freely. I don't think it has a reed valve. I remember Mick saying when he first got it that it may have a bit too much go and he thought they had removed weight from the flywheel but when he looked they hadn't. It's probably got a modern electronic ignition on it. Suspension is Magical shocks and front spring set up which work really well.
I'd love to have a try on it as I bet it is very nice to ride. The modified 250 I tried when I was in Spain was very good and would be very similar to Mick's other than it retained Ossa forks and used a Montesa 242 swingarm. It is owned by the man who makes the Magical suspension kits and shocks.
That's about all I can remember
I had a go on the bike last year and it had far more go in it than my 250 engine (which Mick rebuilt)so id say it was a 310 then< the rest of the bike rode alot like a fantic 240 , but i suppose that was the idea. It really is that good.
All of this is down to personal preference,but even a standard TY250 in good shape is perfectly OK,in the south west you only have to watch riders like Barry Barthorpe to see what they are capable of.To say the engine is/was dead is unfair,there is enough reliable grunt for any of the twinshock sections around now,granted they dont have the zap of a modern Beta or Gasser - but to 99% of riders that is a handicap anyway.
The thing is that either a Maj or standard TY are as good as is needed for twinshock stuff every weekend of the year - wherever in the world you are,the few spares you need as we all know are in the most part cheap and easily available.
I agree,they just seem to be detuned to much.
By the late seventies the fashion was to have big bore bikes like all of the spanish bikes,the ty 250 had to play catch me up to an extent hence the 320.
When i bought my 320 9 yrs ago i used a fully rebuilt 250 engine {all genuine parts} while i sourced a genuine dt360 piston to rebuild my 320 engine and no matter what i did ,26 or 28 mm carb, lighter /heavier flywheel , different reeds , holes in airbox etc it was flat as a spaniels ear so it got sold and every other 250 engine ive ridden has been the same, with the exception one in a godden frame that appears to me has had some porting done back in the day.
The 320 engine in my opinion is far better but is still not as good as the fantic engines they where competing against
Im not knocking ty's , I love them ive got four of them but the 250 engine is my least favourite engine out of them all even the ty80 engine seems more fit for purpose.
Hope i havn't offended any one from the south west as i married a Devonian and i'd hate to run a gauntlet the next time i do Exmoor/Dartmoor
Your dead right, the yam framed ones are lighter and with the swingarm lengthened I dont think you really need to alter a standard frame that much,which is why alot of people stuck on a majesty tank laid the shocks down and away you go.
Stearing is fine as are the brakes and ground clearance the problem was always the dead 250 engine and the rubbish forks particularly the damping.
Ive had a go on a genuine yam modified framed 320 and it is more than adequate for todays sections.
As for the original Godden frames mine appears to be gas tube mig welded and nothing sophisticated at all , must have been cheaper and quicker than to alter the yam frames. The new Mawlem or Mata ones are absolutely georgeous brazed if not tig'd lovely tubing but they are what they are new and expensive which is probhably why any non yam framed majesty seems to fetch silly money.
The majesty seems to be regarded similarly as any works bike of the day and not a modified early seventies trail bike which is basically what they are.
Has this set a new level for majesty prices, it leaves the rest of the majesty owners thinking!
I could see a problem of fake majestys flooding the market.
No , I think Mr Mawlem and the eager french market set the bar for majesty prices and of course most people who have them now dont really want rid. Would you sell yours ? I wouldnt sell my two in fact im after another if i can!
Large number of the yam framed ones are fakes {or home brew versions} thats why they only fetch
Thanks again to Bill Hartnell and the other folk for a great weekend. The sections were different and mostly harder than the previous years and we loved it. Arni missed beating Ian by one mark...I hope he will come back next year.
Thanks to George and all the other helpers for marking out and also a thanks to the obersevers
Bit of help please - I know one venue for this trial is Barbrook, can anyone tell me where the other one is as I can't find anything on this trial anywhere on the net. Don't want to phone the secretary unless I have to.
Also, which is the day 1 venue, Barbrook or the other one.
Thanks
Edit - sorted now thanks.
Woody the first day (Saturday}is at a place called Cove near Tiverton come off the M5 at j27 head into Tiverton on the A361 then look for the A 396 to Minehead after about 3 miles just follow the orange arrows round the little winding lanes and you cant miss it.
I dont think your getting anywhere near 200cc with the mono piston (will have to look up the pie formula to be exact}and i havnt investigated the skirt area yet but theres definately no spacer. A well respected local rebore/engineering boffin who did quite a few in the day explained that the skirt on the twinshock piston did require a bit of work and the gudgeon pin was bushed to accomodate the difference in pin diameters.
Hi , Ive got one with what looks like a yam mono 250 piston in it (69mm)with no spacer.
you can go as far as 70mm twinshock piston but it will need work to the gudgeon pin and skirt/barrel spacer to achieve port timing, and if you like your bike get a genuine yamaha piston even second hand with new rings and have it bored to suit.
plenty of pistons on US ebay and rings seem to come up regularly on UK ebay
With us at Peak Classic they do all ride in the same class. Only differentation is Clubman route, Intermediate route or Expert route. It's even been known, Martin Stanistreet at the last round, for a British Bike rider to deliberately enter the normal Twinshock class against Fantics Majesty's etc and beat them !!!!
Look forward to seeing you Dave at some of our rounds especially those other than at Bracken Rocks which i know you are a bit partial too
Your right Martyn did beat us all on the james and its not a britshock either its a 1957 captain frame with a 197 8e engine , james hubs etc. Dont think its even got marzocchis in the sliders.
The only thing thats been modded is its got a 32/37 e 4 speed clutch and gearbox engineered by the legend that is Mr H Stanistreet.
Makes a mockery of the millenium james really especially when you consider that he was actually winning Scotland for about 20 mins last year.
All for a fraction of the cost of a Bantam britshock
I see the new ACU rules for class 8 and 11 require that the twinshock suspension be "as fitted at time of manufacture". No more canting forward of suspension units then?
Think it means no early mono's converted to twinshocks.
The laying down of shocks was pretty commonplace with alot of the bikes at the time privately or by the factorys. Not always an improvment on some bikes.
. Il try and upload a photo of the bike before we restored her.
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