bsacad

Hello I have a nice rear wheel built on a D10 half width hub that I used to run in a C15 frame and swinging arm. I was thinking about using it in a B40 WD frame and swinging arm I have for a vintage Mx build. The spindle is obviously a little short in the B40 WD swinging arm, are there any other longer spindles that fit the Bantam hub to help with this?

Thanks for the reply. These are the ones I was looking at. They seem to be a slightly different model....

If you get around to doing this mate and let me know the results that would be great.

I have a set of Betor forks from a Sherpa on a vintage flat track bike I'm building. A friend has offered me some Pursang lowers with the in-line axle which would be better for racing. I was wondering if it is possible to swop the stanchions and internals from my Sherpa forks to the Pursang lowers? The length will be adjusted anyway so that is not a consideration at the moment. Sorry, I know this is trials forum but it seems the most knowledgeable about Bultaco forks that I have found. Any help much appreciated. Caddy

With all the mods I’ve found on this engine already it may have a roller bearing big end (fingers crossed). I think I’m just going to have to open the cases and get the crank out somehow and have a proper look.

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 was safety wired everywhere, with the kickstart and alternator removed pointing to some kind of race history (grasstrack or road race maybe?). I went in deeper and found the cam was also the SS80 type and the distributor was already removed and the shaft from the oil pump grub screwed in place to stop it working free. From the things I have read the weak point on these engines is the timing side bush and with the other mods making it a bit more lively I was wondering if the needle bearing conversion had been done. I don't have the tools to remove the crank at the moment (never worked on a Brit bike engine before) and I was wondering if I made the effort to take off the pinion and distributor worm gears if I could see if the bearing conversion had been made from outside the crankcase? Sorry for the long winded question.