samwisemcg

Turbofurball, when you had your engine rebuilt, was it done by a friend or by a professional you didn't know? The reason I ask is I have a 348 that could do with an engine rebuild and I don't know anyone in the south who will work on a Montesa. Thanks, Sam

Thank you, I found the number in the end and it is a b40 frame. It is under some thick paint and only just visible. I probably wouldn't have found it if I didn't know where to look. Thanks for the help all!

Thanks for this, I really appreciate it. I'll take a look this weekend and see if i can locate it. Cheers

Thanks, thats really helpful.I will definitely have a read through this page when I get a chance. There is something else different about my bike. It has an alloy barrel and it was said that it could be a works barrel/engine. I can find aftermarket alloy barrels, but they all have 10 fins. My bike has a 9 fin alloy barrel. Strange... I guess it doesn't really matter what it is, as I couldn't be happier with the bike.

Thank you. That definitely looks like it could be the frame. Thanks for the help.

It's funny you should mention that. I have spent a lot of time on that site this week, it's a great read. I did check here and can't locate it. i wonder if the paint on the frame is so think it has covered it up. Thanks, I did look into the b40 frame, but they have a removable rear subframe and my bike doesn't. I haven't had the chance to ride it in anger yet as it still needs running in. I'm looking forward to getting out on it.

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 look like a modified b25 frame, or maybe a c15 frame? Any help would be much appreciated. Thanks Sam

A magazine did a couple of features on commerfords recently. This is the best image I can find at the moment. I'll try and get a better one.

It's funny you should mention the brake rod, as it's one of the things I want to change. The previous owner had routed it like that, because if it takes the original path (inside the shock) then it get's pinched by the spring. This is mainly due to the way the falcon shocks have been put in. If they were upside down then it wouldn't be an issue.

This is the best tutorial I could find, it shows the whole process sped up, with captions telling you what grade of wet and dry to use. It's well worth a watch, especially as the results are so good. I haven't done this myself yet, one day I'll get around to it.

Thank you, however the bike pictured isn't actually mine. It was just a photo I found on google. Mine (pictured) isn't quite as clean as that. I've never got round to doing the clutch arm mod, mainly because I fitted a set of domino levers and the clutch now feels light enough. Mine has the toolbox, although I've never used it. I've kept it for originality and the fact that complete air filter/toolboxes are hard to find. I don't have anything protecting my swing arm either, just the tensioner underneath the arm. They are great bikes though, I should really get mine out more.

You essentially extend the clutch arm by using a 428 chain link, giving it more leverage and making it slightly easier to pull. You should be able to make it out in this picture.

Hendrik, that is a great looking bike. I too use a Mikuni on my cub and it's amazing, it starts first kick and so far has never let me down. It also helps that the club I ride in doesn't mind. I know some clubs will not allow pre 65 bikes to run Japanese carbs. Anyway,with the shocks I faced the same dilemma as you. I ended up going for NJB Experts for a few reasons. I heard great things, the price was good and they didn't look too modern. They have been great so far, no complaints. I also use steel falcon shocks on my Fantic and they too are great, and rebuildable. I hear great things about Rockshocks, but for me they just looked too modern. I can't help you with the forks as my bike came with Metal profile. I'd love to get my hands on some heavyweight triumph forks one day though.

That is one gorgeous looking cub, I wish mine looked that nice. My wiring is a bit of a mess, so when I get time I will be doing the same as you and fitting the STK200. Let us know how you get on and if you have any issues. Thanks

Send me your email address and I will send you a pdf version of the hand book. It's not a workshop manual but it has exploded diagrams of everything and about 8 pages at the back with specs and service info. cheers