Pre-65 Bikes

Having today missed the Classic Experts trial due to a failed electronic ignition (the 2nd one from Simon Bateman that has broken down) I now need to find a good replacement that performs and is reliable. Can anyone give advise on which way to go please????? Thanks

Hi: I pretend to race with this bike in the next Scottish Pre-65, last year I burned the ignition where beaking down is a nightmare; Meall Na Cruaidhe, fortunately it has now a good ignition fixed. I have the next the next troubles with it; 1.- Rear mudguard, I can not find an alloy rear mudguard for this bike, they are either short, too wide or too narrow. This one is built out of 2 plastic bultaco mudguards, but would like to put something more original. Maybe Spain is not the place to look for this mudguard. 2.- Is there any webb where to buy sprockets for it?? It is slightly "short" for me. 3.- Something apparently easy, as making the fork soft in the beginning and…

So, still got the metal on metal noise after the bike has run for around 10 minutes. I sat looking at the engine tonight waiting for a eureka moment and maybe I had one. Have a look at the picture, could it be that as the oil heats up it just flows downhill to the inlet rocker and doesn't bother to flow uphill to the exhaust rocker? The oil starvation from the exhaust rocker then creates the noise.

my project currently has some 36mm jap forks in that are not really suitable for trials, I am planning to change to bultaco 35mm leading axle forks as I have access to some, my question is what type of yokes? cubs are non parallel with 1.5 degrees in the yokes as standard, but given that I am changing to leading axle forks should I be looking of parallel yokes to compensate for this change or would non parallel ones work without causing issues to trail/rake?

Just I-ve received the letter of Pre 65 Scottish 2 Days entry. Number 5 and plenty of ilusion to ride again.... Any news about routes, sections ???

Hi, I know this is a common problem and I have to get it past tdc before trying to kick start. I have a standard crank shaft duplex gear (19t?), low compression piston, 'R' Cam, strong clutch springs, ally billet pressure plate, primary chain tensioner and fill the case with about 100cc of ATF to keep the primary chain wet. I also have the Alan Whitton Modified (longer) Clutch Operating Arm Assy. The clutch slip when kick starting seems to be getting worse. This may be because the rings have bedded in and raised the compression. Should I just tighten the 3 clutch spring adjusters by a turn each and see what happens? Any advice appreciated. Bruce.

Hello folks, I have just arrived on this forum, I recently bought a '63 trials cub and I am looking for advice on the best way to get the front forks set up, or should I just replace them with a set of Cerianis I have ?

Has anyone converted a Gas Gas Alloy Kickstart to thier Cub? if so can you tell me what i need to do if you have the time

Hi Guy's, Who makes a front and rear trials tyre that (4.00x18 & 2.75x21) that most resembles a Dunlop "universal" trials tyre of yonks ago ?. OR is there still a supply of Dunlop trials universals ? regards to all, Pat.

After 18 months, I finally fired up the Cub today. This is the 1st bike engine I have assembled and although pleased to hear it run, was slightly dissapointed at the amount of smoke and various oil leaks that need sorting. I have the following questions: How long does the engine need to run before it stops smoking? Mine has run for about 5 minutes which I thought would be enough to clear any assembly oil but it still smokes! The barrel had a good bore (hone marks still evident) and I fitted a new piston and rings during the rebuild. Is there meant to be a small quantity of oil seeping into the RH (Side point side) case? There is a vent hole near the bottom. My eng…

I have a C15 with Alpina forks and 13 1/2" shocks. The frame is a 1960 C15S, gooseneck type and I struggle with the lack of ground clearance. It is 2 or 3 inches shorter than a TLR200. I also have a spare, later model, C15C frame. Do these later model competition frames have more ground clearance? How do others deal with this lack of clearance? Probably due to the offset Bultaco forks, it turns pretty well so I'm reluctant to just jack up the back end. Plus, I don't have that much ground clearance myself.

Restored by me last winter, pictures during the rebuild are in particular order ,The gear leaver was off at the time of taking the last pictures and the front brake cable needed connecting as well. Also found out the bike has a 1949 front tyre on it as well! Still got a few bits and bobs left to do to her. Before: After:

Lots of interest in my friends Sunbeam today at the Vmcc trial, thought I'd post a pic, for anyone interested it will be competing in the 2016 Scottish.

I was wondering if anyone could help me identify a bsa frame. The engine is a b40 and I was told the frame is a b25. There are a couple of things that seem strange. The log book has it down as a March 65 bike, but I am pretty sure the earliest b25’s were 68. I have the frame number in the log book, but I can’t find it on the frame, does anyone know where it should be. Also it seems like the frame has been modified. There should be 2 center posts, from the foot pegs up to the front of the seat. It seems like these have been modified to one center post. After having a look on google I can see a couple of b40 trials bikes that look the same. Does this lo…

Still working on my 'new' 500 long stroke Ariel The carb is an Amal concentric 626 and it's worn. Specifically the slide is very worn with loads of movement in the bore but a new slide is very tight which suggests a poor / distorted body. The jetting is bushed pilot, 106 needle jet, 160 main jet, 3.5 slide. Now I could order a new carb with the same jetting but I think people are using 622 carbs these days to improve low speed running and control. If that is the case would I keep the same jetting and slide in the smaller carb or would I have to change it?

Hi All, I'm building a B40 trials bike and wonder if you could help with primary and secondary sprocket selections? i don't have a crank primary sprocket or gearbox output sprocket yet or a rear wheel sprocket. any help would be much appreciated and save me some money and a lot of time getting it right! cheers Michael

Firstly - Hello to you all I am picking up a Sprite trials bike this weekend fitted with a Sachs 125 engine, accompanying it is a spare Sachs engine & chromoly frame. The bike has been sat festering in my dads shed for the best part of 15 years, prior to this it was owned by my great uncle. I stripped to restore it approx 8 years ago, the restoration was halted by a move & I recently stumbled upon this thread which has rejuvenated my interest. My dad has now agreed to let me have the bike as he has no time in which to restore it but I have noticed very limited information available on the internet, I have trawled all the information available online but was won…

I’m covered in oil having had my clutch primary cover off at least 3 times tonight. The problem I have is that everything is fine until I put oil in the case. Then the kickstart doesn’t engage as if the clutch were pulled in. Drain the oil and everything is ok. I’ve adjusted the clutch as per the manual with the springs 3/8” from the face of the plate. Anyone have any advice please as I can’t stomach getting covered in more oil to get the same result. Is there a dry clutch conversion which would save all this and also give some improvements as I’m sure that when I do get this sorted the clutch is more than likely going to slip. Thanks

I see that Villiers services are offering a yamaha clutch conversion for the villiers engine, anyone used it and can give an opinion and also which model it is off?

Hi Numpty alert:!!!!!!! Just wondering what BSA Bantams are worth when modded. I know it depends on the level of mods and quality of the overal job but roughly speaking what are they worth? I am about to start building one but do not want to plough thousands into it for it only 900 quid ( i am new to the pre65's but wanting to get into it....ive seen them varying in price so not really sure?) Cheers