Twinshock

I picked up a 1975 TL-250 in outstanding condition. Still had original Bridgestone tyres and chain and sprockets, and not much wear at all. I always wanted to own a 4 stroke Trials bike and this fits the bill perfectly. I weight more than the bike and am physically strong so the reputed weight of the machine should be manageable. I'll find out later today when I do the intial test ride. The suspension works great and it has heavy duty shocks specific to my weight, and a little higher than stock for extra clearance and better turning. Sammy Miller got his big Ariel down from 325 lbs to 245 lbs. Now I have read stories that Ariel Ht-5 owners are managing to get the weigh…

Ok., for discussion, what would be the pros and cons for both machines? Consider that both bikes have had a full rebuild and also have all required frame mods done etc. Heavily built rider 200lbs (90kgs) This is code for overweight 😂

Hello there I have a Bing 84 fitted on my 1975 Sherpa which needs new gaskets and O rings, but the price I found online is the same as whole new carburettor! Therefore I’m wondering if: A. Is this is the right carb for the bike? B. Where I can find a cheap rebuild kit so it runs properly? C. Can I put a new carb on it? I don’t know much about this bike so any help is much appreciated. Thanks Tom

Hi, Has anyone any advice on what settings to use on the betor rear shocks on my Fantic 200, I have a set of 40lb and 50lb springs and have tried moving the preload ring which not only makes the suspension firmer but also makes the steering quicker when the ring is raised. I weigh about 14 stones , what settings are other twinshock riders using?

Hey folks, I am looking for magneto for armstrong hiro 250, or would any other magneto fit it as long as its ok for key & shaft? any info would be great thanks in advance.

Has anyone got some mini Majesty pics, im thinking of building one to ride, also in 5.9 12.5stone will it be a tad on the small side?

Hi All Attached is a photo of a front mudguard from a Jumbo SWM. They were a universal guard with 3 flat sides rather than a rounded section. They are not stamped with any logos and were used on several other bikes including Armstrong Monos, early air cooled GasGas and even the RTX. I have recently seen several bikes with white versions, but no-one seems to know what make they are or where they got them from. Has anyone any idea who manufactured these and if anybody is still selling them in any colour. I have checked and dont think they are Acerbis or Gonelli......any other ideas? Thanks Martin www.motoswm.com

Is there anything wrong with using a Tubeless Dunlop D803 with a tube in it, on my vintage Twin shock? How different are the two tires; Tube Type & Tube Less. I thought I ordered Tube Type, but just realized they say Tubeless on the side. Again, they are Dunlop D803's. Thanks

Hi Guy's. Just thought I better post this into the right spot. It is time to consider every option we have to get new blood into the sport. And OTF has already said they have this type of class in the Peak Classic trials , so there is a start. Anyway this is what I posted onto Pre 65. Just think about it. :thumbup: Hi Guy's Hi ElGringo. What you have said in your piece, makes me think, that what a friend and I have been thinking, is probably one way forward to get more riders into the sport.CHEAPLY. What we were considering was a "Trick-Shock" class, where the only stipulation for the bike being built would be. "A"] to use and air cooled engine of any origi…

Returning to this site after long time,but same bike lingers in same barn, Norman B4/Villiers 8e moded somewhat. What I need is a running proper trials bike. My nostalgic favourites appear to be Montesa Cota 247, or as I never got to buy one in the day,a Fantic 200,though I have not ridden one of these. My local French club keep asking when will i roll . I've seen latter for not a lot of money, any opinions? Thanks.

I loved that Whitehawk That's a certain (present day) bike importer in the background who was helping out at a training weekend on the land under the original Severn Bridge. Fairly sure it was Gwent STC who organised it.

Hi, I am trying to find contact details of the Cotswold twinshock motorcycle builder, Jon Bliss I think. Thanks.

I am trying to get my Montesa Cota 350 clutch to work perfectly...ha ha. The clutch drags when it is cold so the cable has to be tightened too much. When the bike is hot, the clutch works good and the cable can be loosened a little. Sadly, I have a bit of experience with the Montesa clutches but I

Hi guys, lately i've bought my second orange OSSA. But i recognized that the petrol tank isn't connected with the seat than the "normal" TR80's but seperate. Does anybody know, how the seat is fixed, or even has a hole picture of the bike? Because the seat and several other parts are missing! Greetz

Haven't built the rest of the bike yet, but I thought somebody out there might like to see these ultra secret photos from the Hodaka trials test and development center here in beautiful Oregon, the birthplace of the Hodaka motorcycle. I am envisioning a bike that suits this gem.

It begins.........oh, did I mention it was GREEN!

Hi, Just rebuilding a 247 Cota motor and the big end is a plain (bronze) bush. Ive never ever seen this on a 2 stroke engine. I have a new rod kit so I'll put that in, but I wondered if anyone had ever seen a Monty with a plain bush big end....seems strange, maybe the previous owner was trying to save costs or maybe Montesa did this at some stage - anyone know?? I can see how a bushed small end would be OK, as the movement is only through a small range (maybe 20 degrees per revolution) but the big end moves through 360 degrees. Having said that plenty of 4 strokes use shell type bush big ends - but are oil fed... Any comments anyone? many thanks Stu

I have led a sheltered life, in my sporadic trials carrer spaning close to 5 decades now i have only experience with a few engines. BSAs bantam cota 123 and ty250B s oh and a ty80 Now recently considering an engine swap then deciding against it, i got to thinking did the members of this forum have any particular engine type or capacity that they would chose for their ulltimate air cooled twin shock project. What engine what capacity and why exactly detailing what it is about its power delivery torque respone etc etc you like so much about this particular engine.

Have just acquired a rare aprilia 50 trials of 1981 vintage..... (similar to a fantic 50). It's got the obligatory minarelli motor but the carburations a bit, erm, fluffy! -runs all nice at tick over, ok on full throttle but not so good on the rest. Carb doesn't have a pilot jet, just a main and an emulsion tube. Anybody got a carb of japanese origin (approx 15mm) they would care to pass on for a good price......? Andy. ps. or 125 honda 4 stroke motor.......

Why can't a modern Montesa tubeless rear rim be built onto a Cub/Bantam/Sherpa etc. rear hub?.