Classic Trials

hi, complely new to this game.i have a b25in need of restoration and was going to do up for road use,and green lane. but after seeing a local trial in norfolk by the dabbers club. iwondered if it would be suitable for a begineer to start on. and what mods would have to be done.ihave allready but a 21" front wheel on it trials pegs ali tank and gaurds. any sugestions or should i buy a trials bike like a c15t.i enjoy working on the bikes and have built other bikes like a triton and have my own lathe etc. any one have ideas?

Just bought a Bsa b40 with the gb engine Can anyone help with the correct gearing Also not sure if the main jet is right carb is a Amal 626 running a 160 main Recomended sparkplug? I am sure there will bemore Marty D

Right guys at the clutch basket i have a wobble Seems that the input/output shaft not true Does this make a difference? Clutch is snatchy and dragging and slipping Any Great ideas?? Marty

I have just purchased what I've been told is a 1968 BSA B40 Otter Military with engine number B40 GB 1123 can anyone help with confirming the age of the bike? I'm also looking for a manual and want to make sure i purchase the correct one Many thanks in advance

Hi, I would like kindly to ask an advise. I have VM22 round slide carburettor in my garage. It is bolt on type.I wonder if somebody has an experience in using Mikuni VM 22 round slide bolt on carburettor in B40 trial version engine. My engine has compression rate around 6:1 or a little bid less and one inch long inlet spacer. I am trying to find the proper jetting for this Mikuni VM22 carburettor for using that in my Bsa. Can anybody help with jetting information? Best regards Erkki

Hi guys, Not sure if you will be able to help but I have an disassembled Bantam D5 frame which is partway through a trials conversion. I would like to change the headstock angle but can't any information on how much to change it. I am unsure of the original angle from when the bike is built up with original forks and rear shocks - I would like to increase both the front and rear by the same height, so if I could find the original angle of the forks when resting, I could tweak this by x amount until I have the angle I require, which will remain constant despite the height. Has anybody else done this modification and knows how much to change it by, or does anyone have …

hi. is it possible to convert a 3 speed bantam engine to a four speed. thanks charlie

im currently having problems with my bsa bantam d3 trails bike and was wondering if any one could offer some hints or help as i have nearly run out of ideas. ok so heres the problem. When ever i try and kick start the bike it wont start cold. The bike will bump start easily enough and once warmed up after 5 or 10 minutes will kickstart first time, every time with little effort. I have changed the spark plug for a brand new ngk plug (correct numbers) I have checked and the plug is definatly sparking. The plug gap is correct 0.018 1inch The contact breaker points gap is correct. i have cleaned the points up i have checked the air filter and it is clean The bike has…

Hello guys iam stuck , i need help in the re assembley of the rear wheel spindle , bearings shims ect.. to my bsa bantam rear wheel hub which has now been powder coated and ready for the rim rebuild This is to be fitted to my c15 project , its been that long since i stripped it , i cannot remember the correct fitting of the shims and distance pieces. Help appreciated .

Avise needed please. Iam building a bsa bantam trials project , not for competition use . can any one advise the best way to go to replace the front forks for more modern replacements that would be suitable for trialing . I do not wish to spend a fortune and require replacements that do not require major engineering to fit . I also understand that the bantam swinging arm will not take a modern 400 x 18 tyre with out it rubbing on the edge of the tyre . Does any know how to widen the swinging arm ? Help and advise appreciated

Group, Can someone post (or email me) a picture of connecting the rear brake (pedal). Just looking to see how it can be done on a Bantam. Thanks Alan

Hi guys does any one know which silencer i can fit to a trials front pipe which fits through the rear frame on the c15 ,? idealey road legal as i intend to road register the bike . info or suggestions appreciated

hi there am new to pre 65, i am in the middle of building a BSA c15 trials, nothing fancy just basic and not all British, my brother has a factory T c15 but he wont let me have it so i have decided to build my own with help off the old man, just wanted to say hello, any advise would be great and i will share photos off how its coming along, here's one

help! Iam fitting a bantam cub rear hub to my c15. .. how ever the rear bantam sprocket is a narrower gauge from the c15 chain , i beleive the chain size is a 428 for the c15 . i need to have a sprocket made which fits the bantam hub and is compatible in size to the drive sprocket and chain on the c15 does any one know where i can get a rear sprocket made ?

Hi I am going to replace the clutch on my c15, not sure what with either a alloy one, or maybe a belt driven one. has anyone any experience with the belt drive is it worth the extra £££

Hi,New to this site done twin shock trials (badly) withTY175 but I recently bought a otter frame and wheels and a set of C15F cases and crank with alpha big end got a set of wide ratio gears from a b40 wd which I believe will fit in.considering putting a big bore barrel ie.triumph 500 piston any other suggestions or comments,will fit electics world ignition.

hi just bought a c15 engine distriputor type.thinking of putting it in oif b25 frame to do a few small club events.going to strip engine to check any usfull suggestions without braking bank.will fit elecronic ignition.cant find engine number.

HAPPY CHRISTMAS EVERY ONE . I need help on my winter project , a bsa c15 , but i have hit a problem immediately during the first few minutes of starting work on this project .( back to the repeats on tv ) Iam using the original fork seal holders which are missing the seals i have the new ones but the bsa manuals are very vaig and give no info , they give no indication on which way up they fit in the holders ? Does any one know if the flanges on both the seals face upwards towards the yoke or face down ? any information supplyed will be very appreciated

Can anyone give ma any info which will aid me in removing the inner timing cover , it seems to be sticking round the kickstart shaft . It seems I don't have the knack removed all bolts but cant get off said part .

Hi Guys I have C15 distributor engine .Is BSA C15 kickstart spindle/Quadrant interchangeable with Tiger cub T20.. I am missing kickstart at the moment. I have some friends who might have T20 kickstart I was googling around found the below ebay item .. 111578488882 ,( BSA Triumph 57-1279 40-3022 75-3121 C15 T20 Kickstart Quadrant NOS ) they seem to be interchangeable , please advise. Regards Aziz