Pre-65 Bikes

Can anyone help with an issue relating to B40 / B44 engine specifications? I have bought a B40 to convert for Trials. The B40 Engine has a B44 round Aluminium barrel with std bore. Found so far;- B44 Al. round Barrel marked 41-42 with a gasket face to face of 82.4mm B44 piston 41-571 (std bore) B44 con. rod marked 41-550 Problem When turning the Engine without the Head the piston at TDC is above the Barrel by approx. 3mm Same problem with a std B40 piston 41-075. I believe the Barrel has been reduced in length but suspect machined too far. really would like to use this Aluminium Barrel, The B44 con rod results in a stroke of 90mm (not 70mm as B40). Questions;…

I'm trying to hold of an alloy gear lever for a Burman gearbox, I think they were made back in the day. Does anyone know where I might be able to get hold of one, been searching on flea bay with no luck. Thanks all

Guys got decision to make Looking for a "NEW" bike Thinking of a Triumph twin well modified a Rigid ajs/Matchless Or a Ariel What would be the best for "Modern trials sections yet stiil Scottish pre 65 acceptable Looking forward to your thoughts Marty D

Hi, My friend Walter bought a Tiger Cub 200 with the old (original) carb, which does not seem to run well. He would like to mount a new but Pre65 (Scottish) eligible carb, maybe an Amal 622. What do you recommend? Where can I order one already jetted for a 200cc Cub? Plus manifold. What about the heat protection, distance to the cylinder? Otherwise, what about a new Oko 22 flatsilde for clubtrials? Which jetting there? Thanks for some hints. Patrick from Switzerland

I'm looking for a really good chain for the project HT5 I'm building, I'm using a 520 chain so there should be few options out there. What do you recommend?

I'm trying to tidy up the oil unions going into the inner timing cover on an HT5 replica. Can someone please let me know the size and thread used for the unions that go into the timing cover? The original part numbers for the unions are 5890-35 (taken from the Draganfly web site) Thanks

Can this seal be changed from the primary chain side ? Its a GB engine. Thanks Ross

Hi Guys My first post & I hope it's in the right Forum Can anyone recommend a supplier near to Solihull West Midlands able to rebore my B40 barrel & supply a new piston, ideally at a sensible price. Thank's in advance Cheers - Frank

I have a problem with my B40 fork ( heavy weight ) When I put the Fork shaft into the Bottom tube the lower bush stops at about 2 inches, normaly ( at Spanish and japanese forks) I can move the shaft down to the ground of the tube..... What should I do ? Reducing the diameter of the lower bush a little bit ? I change no parts except the seals on the fork and before disassembling everything works fine......

hi all, has anyone any ideas on replacing the standard villiers clutch on my pre65 scramble bike,[i know not trials] .i would like to replace it with a jap one,ie conbination of the two, that will still fit inside standard castings. any views greatly appreciated.

Hi all, first post here so here goes.. What are the best donors for 'Fiddle' forks? I have some old long roadholders off an ES2, but have no knowledge of Marzocchis and Betors. What are the newest that are suitable for alteration , in fact, can you buy new anywhere? I'll probably ask mr Whitton to work his magic on them, just want to assemble as much kit and knowledge first Dave0304

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.

I'm going to need to purchase some new rear shocks soon for my Bantam, I'm leaning towards Rock Shocks but would welcome opinions, experiences etc... What say you?

Does anyone have the part number (or sizes) of the taper roller bearings for converting the tiger cub / Bantam headstocks?

As above,the seat on my AJS has a big hole in the cover.No idea where it came from originally or what it was intended for,but its just the right size/shape and its comfy on the road.I just want to tidy it up a bit. So who do I go to ?

hi guys, just wondering about the alloy mufflers a lot of pre65 bikes use....you know the elongated diamond type, has anyone any idea what the baffle arrangment (if any) is in these? i am guessing the inlet and outlet pipes stick well into the 'can' so that the gas has to double back to get to the outlet pipe.....are the pipes perforated any, or just plain. reccon charlie will know the answer as he's built most things to do with the old 4 strokes. cheers trev.

Any ideas where I can get a small spin on oil filter and housing as seen fitted to a number of pre 65 bikes? Thanks.

Hi, I am another building a bantam trials! I have alot of the bike but am looking for more info. I followed a thread where members were talking about mods and info for bantams and were offering to send on what they had. Any chance of someone letting me have this info? it would be much appreciated. Thanks

I know its not a trials event but this forum seems like a good place to tell people. This event has been cancelled following a site visit today.due to the flooding on site.Its been put back to the 2nd sept and all passes will still be valid. http://www.thetaverners.com/

Hello . Could someone suggest what oil to use for the engine and gearbox on my cub, Thanks