Pre-65 Bikes

I need help with a project I have bought which I was going to use for spares but after giving it a look over I think it might have a bit of history to it.My thoughts are that it has been built rather well,its frame has been modified with twin rails under the motor (the frame number is d10***)and is clearly bantam and the rest of the bike has been built with a lot of thought,does this ring any bells with anybody.Thank you.

Question. I've had a question from a guy who has a Sprite trials bike in basically standard condition with an iron barreled Villiers 32A motor. He wanted to know if the Sprite was eligable for Pre65 events. Now i thought that Sprites were made from 65 onwards so they are most definately NOT eligable for Pre65 events. Not a problem to ride in our events as we dont have a Pre65 class any longer as i felt it was too much of a minefield so the class has been changed to British Bike but he was concerned taht his bike is or is not eligable for Pre65. Roy Bacons book seems to infer that as i said they are not eligable but canb anybody here give me a categorical answer?

Hello Does anyone knows where to buy the plates that are used in a pete kirby bsa clutch? I have 2 early clutches and i want to fit the newer type plates but i cant find them. I am not able to contact Pete for info. Regards Bob

Hello, Fortunately, I noticed my Mountain Cub (1965?) trials conversion bike stopped pumping oil before it got too hot. I assumed it had a bad oil pump. I found a new NOS pump for $50, so I went ahead and bought it and installed it (not a fun job). Unfortunately, my bike still isn't pumping oil. Although I'm not a triumph cub engine expert, I have rebuilt, from the crank up, three motors and they have ran great after my rebuild, so I do know my way around the motor. I was very careful to install the pump correctly and it was spotless when I installed it. Could the "dry" sump not have enough oil in it? If so, how would I add some oil? To note, I haven't pulled…

Might anyone know of a lower compression piston compatible with the B44?

Hello, i have a NEB clutch in my bsa trials bike and it is too sharp and agressive. i only use 4 of the 6 spring to make it softer but it is still very sharp and hard to control. I used to lubricate the plates with light gear oil before but after half a trial the clutch starts to stick and wont free complete. Now i run the clutch dry and it doest stick any more but it is very grabby. Did anyone find a trick to make this clutch work for trials ? Different plates or springs or an oil dat doesnt start to stick ? Kind regards Bob

Hi, did anyone take over the manufacturing of Ariel barrels , or has anyone got one they’d sell ? I believe Mick Dickinson passed away but please correct me if that’s wrong

Hi everyone, I have recently got hold of a triumph 3TA twin engine basket case. This will eventualy be slotted into a royal enfield 250 crusader trials frame to make the popular TriField or Tri Enfield machine. Has anyone out there built one of these bikes, and if so what would be the best engine specification to go for - 350 or 500, There are a lot of tuning options from stock 350 to Daytona 500. etc Any info and advice greatly apreciated. Jon Summerfield.

Is the Amal Carb for Cub Mk1 626????

hi all recently finished my project bsa c15 trials bike fitted with the above ignition system,all is well with the bike until it warms up then it develops a very bad misfire and loss of power,the engine has had complete overhaul the carb has been stripped and cleaned and all jets have been renewed just wondered if anybody has had any problems with these ignition systems as i am starting to think that the coil/cdi unit may be faulted. thanks chris

A friend of mine has just purchased a nice C15 for Classic Pre 65 Trials. It ticks over evenly, pulls well at the bottom end, but runs out of puff when being pushed up a hill climb . I’m sure it needs a larger main jet, but I’d like to get the whole settings right , from Amal carb type to all jets , needle and slide. Thanks everyone.

Trials compatible rear hub/sprocket assembly for standard (ie engine mountings not offset) '64 BSA C15 road going frame. Anyone got any suggestions?

Wouldd7 barrel work on b175 bottom end for super stock racer

Hi Guys, Does anybody know any information on the following machine. BSA 441cc Victor ISDT machine. Registered No HOE 14D. I rode this factory machine in the 1966 ISDT in Sweeden. I would love to know of it's whereabouts, and what it is doing now. I have enquired of the DVLA but they inform me that as was not the registered owner of the machine BSA were, they can not tell me where the machine is now or who the registered owner is. Basicaly the machine was a 441 cc Victor scrambler. It was modified for the ISDT, one of the striking features was a large alloy fuel tank basicaly the same shape as the standard Victor one. I do have a photo of the machine but for some reason …

Hello all again I'm after some advice. My B40 is running 13t gearbox sprocket and 60t rear but I feel I need a but more speed on the hills. What combination are people running for trials? Many thanks

Hi I am wanting to apply for v5 for my bsa b40, the frame has four numbers stamped on the headstock is that right ? Any help would be appreciated.

Hi Guys. Here

hi there , has anyone ever weighed an alloy cub replica front or rear hub to compare it to the cast iron original type cheers

REH forks currently seem to be the preferred choice for anyone looking to build a competitive pre 65 bike. The matching yokes are listed as having an offset of 40mm, which is a bit less than the original setup on my Bamford Matchless, and by my calculations would increase the trail from approx 4 inches to around 5 1/4 inches. Any of my background reading would suggest this would be a bit excessive. There's no doubt the REH fork movement feels terific, but I'd be interested to hear from anyone who is using the REH yokes on a pre unit bike (particularly those with more traditional frame geometry) how the reduced offset has affected the handling, if at all?

REH forks currently seem to be the preferred choice for anyone looking to build a competitive pre 65 bike. The matching yokes are listed as having an offset of 40mm, which is a bit less than the original setup on my Bamford Matchless, and by my calculations would increase the trail from approx 4 inches to around 5 1/4 inches. Any of my background reading would suggest this would be a bit excessive. There's no doubt the REH fork movement feels terific, but I'd be interested to hear from anyone who is using the REH yokes on a pre unit bike (particularly those with more traditional frame geometry) how the reduced offset has affected the handling, if at all?