Pre-65 Bikes

need some help what sprocket do you use on your c15? any help would be good thanks mikey

before i order chain and sprockets, what combination do you guys use 13-64 ? it has the road going gearbox and 18-52 clutch.many thanks

Hi all, I needed to clear a little space and raise a few quid (impulse buy of a Bultaco!!) so listed my dismantled C15 SS engine on good ole Ebay. Based on a couple of other C15 engines (one made

With end bolts removed, should the swing arm pivot shaft just tap out? Mine seems to have a little play and then locks up like it is hitting something. Any suggestions?

does anyone know the amount in degrees advance I want to be using with a Sammy miller pvl???

Hello A frind gave me this bike. Frame is a C15S and there is a scramle engine fitted right now. A spare engine C15t came with the bike. Does enybody now about these bikes? Is it a scrambler or a trial bike? Wath is the difference between them? I woud like to use the BSA for classic trials, what do you suggest to modify to use it properly? cheers Ulrico http://thumbs.picr.de/5578781.jpg http://thumbs.picr.de/5578784.jpg http://thumbs.picr.de/5578785.jpg

Hi. I have decided to build a c15 trials bike. I am fitting a 400.18 rear tyre which is slightly fowling the chain. Could anyone advise me the best way to get some clearance un order to fit a chain guard. Do I move engine mounts etc?. Any advice appreciated

hi all. firstly it doesnt look like my tablet likes the website and wont let me post a carriage return so apologies for the stream of conciousness style. putting a bsa c15 together and im using a bushman rear hub - i believe this is fairly common. 2 questions, anyone know where i can get a rear sprocket made up as it needs to be bantam mounting but c15 thickness? And anyone know the tricks of the trade to fasten it to the hub - as the bantam uses a crazy 7/32" bscy bolt which only appear to be available in the bantam length - as the sprocket will be thicker do i need to get the sprocket countersunk? Hope some one can help. jim

Hi, Calling all BSA experts, thinking about building another pre 65 trials bike, would the C15C make a good starting point? Seems to have been designed as a scrambler,(looks like a stronger frame than the road bikes) so i guess had higher compression and a bigger cam ?

Can someone tell me how a C15C frame is different from an earlier (1960) C15 frame?

hi, i have a bsa c15s that i am looking for info on. the bsa records have the frame number each side of mine but mine is a blank. i was told that this could be because it went to the compertition department. its not shown on vmc bsa records. any ideas were to go next??

Hi guys.. I was wondering if any of you might be able to help me with the identification of an engine that i have purchased but not been to collect yet as I'm a little dubious about the engine number after a bit of looking about. The engine number is apparently C15T 5693 I have had a good look but it appears to me that they did not produce any engines for the C15 with the T prefix past the number 2200... I just wondered if any of you have come across ones with numbers this high as its been advertised as a genuine C15T engine (rare apparently) I just dont want to be a horror and find out its just a C15 with a T stamped on it. Any info would be greatly appreciated…

Hello, my first post on here but been lurking around the forum for a while. I'm in the middle of restoring my 1962 C15T and have come across a bit of a problem. The rear wheel is quite a bit out of line with the main frame loop and after a lot of checking and measuring it seems to be that the whole swinging arm is out of line. The lug that the swinging arm spindle goes through is twisted over to the left of the bike compared with the bottom frame tube. I've found a thread on here with someone with a similar problem, in fact it looks exactly the same in the photo. Here is a link to it: http://www.trialscentral.com/forums/topic/27793-c15-frame-alignment/ All the brazing …

Hi all, couple of questions I have a 62 C15T, is there such a beast as a 20inch front Trials tire still being produced? Also it has a very tired monobloc should I refurbish it and buy a new slide, gaskets etc: or bite the bullet and buy a new one for 165quid.

Hi, recommendation for the best C15T Sprocket combination for trials use, no road work mainly tight and twisty stuff standard C15T rear wheel.

Hi all, sorry may have the wrong site but you may still be able to help me. I own a 1963 triumph tiger cub SH . I am having trouble with the timing on my bike. Having gone through all relevant stuff I'm now looking at the advanced timing unit ATU. Having removed the unit I find that there is a slot in the unit that I presume locates on a peg, but looking down the shaft of the camshaft I cannot see a location peg. My question is should it have a location peg or has it broken off at some point? Any ideas anyone? Thanks anyway

Hi I don't no if this is the right place to ask, I

I'm putting together a C15 with an original oil tank. It looks like there is room to move it in towards the center of the bike. This would make the bike more narrow and possibly make space for the exhaust to go inside the subframe? (1960 goose neck). Has anyone done this? Do you have pictures of the mounts?

Hi, in a previous listing I saw reference to the difference offered with amal carbs of a 2 stroke and a 4 stroke needle. On tinkering today, dont know why as runs like a hamsters heart, albiet if hamsters suffer that vibration at low revs i dont think they could walk straight, i noticed that needle has 1 identifying groove above the clip setting grooves. In Rupert Ratios book this identifies it as a 2 stroke needle (4 stroke 2 identifying grooves). Someone mentioned that the 2 stroke needle is shorter, would this meam or explain C15 with 622-301 running rich not getting the metering of the longer needle at higher revs or am I looking at worn parts anyway. Only info I can …

Hi all, Apart from the standard black plastic like inlet manfolds you can get from places like InMotion does anyone know of any other type available? I suffered a bit with heat transfer to the carb and was trying to understand what options there are out there.