alchemy84

Here is my late 1971/early 1972 Montesa Cota 247 I have been refurbishing, still have a few things to finish like new rear shocks, cover my seat pan, and find the cam and lever for the front brake since they were missing when I picked it up. First pic is how I picked it up last year and second is how it sits today, it is rideable now.

My refurbished late '71/early '72 Montesa Cota 247, before and after shots, I still have a few things to finish like new rear shock, foam and cover on seat pan I made, and find cam and lever for the front brake since it was missing. But it is rideable now.

So I figured out a fairly good way to torque the flywheel but, so I thought I would share. This is how I did it and it worked well but I will also let you know what others suggested. First I tried making a tool to hold the countershaft sprocket still while the engine was in gear, this didn't work because the clutch slipped before I made it to the required 72ftlbs. What I tried next, which worked, is this... I borrowed a chain wrench from a coworker, my idea was to use it to hold the counterweight on the clutch side of the crankshaft while I torqued the flywheel nut. I wrapped a rubber strap around the counterweight to protect it clamped on the chain wrench held it still with one hand and torqued the flywheel nut with my other hand. Worked great, I will provide a picture below. Jared at Southwest Montesa also suggested a blocking tool he sells, which I believe blocks the piston from moving, and runs $85. He also said I could use an impact gun and hope for the best, which would have been my last resort.

Hello all, I am working on a Cota 247 and need to refit the ignition flywheel. Does anyone have any tips to holding the engine from turning so I can torque the ignition flywheel nut? I found a suggested torque setting of 72 ftlbs, so if you could also confirm that is correct I would appreciate that also. Thanks in advance

So I've finally made some headway on making new bushings for my swingarm. I really appreciate everyone's input and made the decision to replace rather than work with the originals. What I came up with was to use the axle and bushings from a 70's Honda CB350, which I had laying around. So here is how I am going to make the setup work. First off the axle is to large a diameter to fit through the original frame holes, so I had to open them up a bit. The CB setup had an axle, which slipped into an inner bushing, which intern slipped into an outer bushing that was pressed into the swingarm. This is what I decided to duplicate. So reusing the axle and inner bushing I had to make an outer bushing to press into the Montesa swingarm. This setup will allow me to have a free moving swingarm that is fully grease-able. I will include a few pictures of what I made below and then a pic later this weekend when I get everything assembled. The first pic is of (from left to right) the stock CB inner bushing, the outer bushing I made, and the two pieces together...the inner piece is free to rotate and has grease grooves, the outer piece gets pressed into swingarm. The next picture shows the shoulder inside the bore that will keep the inner bushing in place, the inner bushing sticks out by .005" so that the outer piece will not come in contact with the frame.

I believe the 247 I picked up has a deformed carb, it is hard to remove the slide and it sticks at WOT, and I read somewhere that is a sign of a deformed carb. Could you please share the fix you mentioned? Thanks and much appreciated

I am hoping someone can enlighten me on the workings of the Cota 247 swingarm, it seems like a dumb question but it is different from any other bike on which I have worked. Inside the swingarm, where it meets the frame, on either side, there is a threaded insert inside of a rubber bushing, a body fit bolt is then inserted through the frame to hold the swingarm in place. Once tightened down the swingarm is locked in place and does not appear to be free to pivot or move. So my question is how does the swingarm then travel through the movement of the suspension? Does it just move with what little flex the rubber will allow, sort of like a torsion system? Or is there something else I am missing? Is there a better method or replacement setup? Such as a bronze bushing/bearing system? Or a roller bearing system? I can make anything I would need since I am a machinist, however I would still like to understand how it was meant to function originally. Also if I were to disassemble and make another setup what should I expect during disassembly? Are the two inserts and rubber bushings seperate pieces? Is there a spacer between the two sides? Is everything just pressed in or is the rubber vulcanized to the metal? Thank you in advance for any light you can shed on this topic. Also if you have an opinion on weather to leave the original setup or convert to another system please comment. This is something that is holding up my rebuild and I need to make a decision on how to proceed. I am also attaching a picture of the threaded insert/rubber bushing setup in the swingarm.

Messed up the picture upload, here's the picture now

Hello everyone, new to the site, just introduced myself in the intro section and now thought I would share with you all my project. I picked up a rough but almost all there Cota 247 late last year. It was half buried in the mud and everything, except a few oil coated spots, was covered in corrosion, however I saw an opportunity to make a nice rideable bike. I became hooked on trials riding after riding a friends Honda tl125 in competition and needed one of my own. The only things that appear missing on the bike are front brake internals and the toolbox lid. I picked up things like rubbers and gaskets from inMotion a few months back and have been cleaning and painting everything piece by piece. According to the Rocky Mountain Montesa's "evolution of the cota" page I found my bike was made between Dec1971 and Feb1972. So I will start off with showing you all a picture and then maybe I can move onto a few question if have since this has been pretty long winded already.

Hi all came across this site doing internet searches for info on a Montesa Cota 247 I picked up late last year. I was in very rough shape and I have been slowly getting it into a mildly restored shape, but the whole reason I picked it up was to ride it in some events and for fun so trying to not go too over the top. Anyway hope to get some good info on this forum and possibly contribute some myself. Jim.