Pre-65 Bikes

So, a mixed day today, the two Tufnol spacers have worked a treat and very little heat is being transferred back to the carb, great, happy days. However, after around 8 sections I get that very painful metal on metal noise. Diagnosis between sections ranged from, big end, small end, tappets, push rods, etc etc. I rode the bike back to van really slowly and after say 5 mins the noise had totally gone. I spoke to someone and tried to make the noise happen again, and after letting the engine run for a while and a few Andy Roberton type laps round the field the noise came back. Does anyone have any thoughts, it must be to do with the heat of the engine or the amount of tim…

i have heard there is a guy in the midlands who builds and prepps them to a high spec. Anybody got any info. As in my wanted add, I have a crazy german who wants to buy a high spec beezer.... if I wanted a fanny , i would ask Bill Pye... Whos the beezer guru in the UK?

Hello, Would anyone be able to help with a wiring diagram for a PVL system on my C15, I bought the bike with the system not fitted and no wiring diagram, Ive fitted it but really would like to double check before i attempt to fire her up in case i do any sort of damage. Many Thanks John.

hi i am busy converting a road c15 to trials was wondering if i should fit standered length rear shocks or should they be longer, my concern would be lifting the rear end to high and making it look really stupid cheers

Anyone out there know of any C15 trials specialists I can speak to as regards engine set up - camshaft specs in particular? I know there are several around who can build nice motors but I don't know who they are unfortunately. I'm a bit lost with Beezas as I have very little BSA knowledge (shamefull I guess as I am from the home of BSA...)

Can anyone advise me Sprocket size for bsa c15 trials . Thanks

Even though I don't have a trials specific C15 I thought I would try posting my question here as there seems to be loads of experience of people working on C15 engines. Hope that is ok? I have a collection of BSA C15 parts that I have been trying to build into vintage flat track style bike having been inspired by the picture attached. I have a complete engine and also another bottom end and head that I was thinking of trying to get a bit more HP out of with a few easy modifications. When I finally started looking at these parts last week I discovered I had been very lucky. The head is SS80 that has also been ported and a huge inlet valve fitted. The bottom end w…

so I have built my c15 almost completely from jumble parts and its time to get her running however there is a problem.. the timing side bush I have turned up is slightly tight I really don't want to strip it back down an if I do I will prob just buy the bearing conversion.. however any one else had this problem when using a bush for timing side? it is very hard to kick over altho not impossible.. doesn't help that im using an m20 kickstart borrowed from a friend.. any ideas on how to loosen her and get the oil pumping round to loosen it up a bit??? any comments welcome

About 2 or 3 weeks ago I saw an advert somewhere from someone selling B40/C15 trials gears for

hi i am new to trials i am building a bsa c15 trials bike, not a factory bike but just for a bit off fun would just like to say hello, will be grateful for any help advise will post pics as i go on with bike, many thanks Mikey

I have a long term project on the go at the moment a C15. Was up the shed tonight and done a dry build on the rolling chassis,seems like I will have to increase the ground clearance as its quite low about 9",not very good.The frame is standard, front forks are standard,What is the best length of rear shockers to fit to help with the ground clearance.As I said its a long term project as I'm enjoying riding my 250 Scorpa and learning every trial I do.Any other advice would be much appreciated. cheers the noo Brian

Hi all, I am having trouble getting my c15 running right, i recently bought an Amal concentric fromm surrey cycles " 24mm with a 110 main jet" and it just wont run right, i was told it would be jetted for my bike, but after playing with it at the Blue Bar 2 day trial this week i had no joy! In the end i borrowed another amal from a friend and this was much much better, but it was a 22mm and had a 140 main jet. Please can some of you out there that a run C15 tell me exactly what works best.. or even if they have a carb that they will sell, it doesnt have to be an Amal, any make will do. thanks: Scrumpy

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

Does anyone know if a pair of B25/B50 forks and Yokes will fit a BSA C15 ? Cheers

I need some advise/help re electronic ignition for a 1960 BSA C15T engine .Electrex world ( which one) Pvl which would be the best ,any recommendations please

It's been a while but have made a bit of progress with the Ex Eastwood c15. DVLA have sorted the reg doc and it is now registered under its original number with the help from BSA owners club. The engine has been rebored and top end cleaned up, electronic ignition, amal concentric. Have just finished chopping the subframe and sorting out a new front mount, I was worried about this as the bike is very original but once I put sensible shocks on I could hardly touch the ground!, anyway the works bikes had the same treatment. The big subframe mount has been removed and the seat has been modded at the front to nearly fill the gap to the tank. When I removed the original si…

Hi Guy

Sorry if this is a bit off topic... I'm in the middle of a build,not really even a trials bike,its an ex Army B40 frame with a B44 round barrel motor. I'm using four bolt forks and a 6" conical BSA/Triumph front hub.All shiny and smart, except brake shoes are rocking horse poo. Mark Cook of CCM Britain or PES apparently made some new billet ones which I'd like to buy.Been calling on the phone,leaving messages and have emailed as well.No response... Any suggestions, the parts are stacking up and it's close to me needing to nail it all together.The idea is a trail bike or long distance trials nail.

Hi folks. Does anyone know who made the frame for that rather nice and expensive BSA C15 for sale in the adds. Too expensive for me but would like a good frame to build my own.

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…