Twinshock

I just recently picked up a Montesa Cota 348 and I am in the process of replacing some parts to make the bike tight and functional again. Alas, it show it's age and use, despite being well maintained by it's previous owners. To date, I've bought new brake shoes and installed, replaced the rear wheel bearings and seals, repacked the front wheel bearings [ they were still good ], replaced a badly leaking shifter-shaft seal, changed trans and clutch oils. I also lightly filed the points and reset ignition timing. I discovered that there was a small hole punched in the case from the kick-starter "bump / stop" on the shaft, allowing chain grease and dirt to enter the ignit…

Who was looking for the aluminum inner tank for a 348/349 (UK model)? e-bay

Hi, I came across this web-site while browsing for info on Montesa 349's and found some advice from, I think, Vintagecota. He said that if the kickstart was angled too far forward, it could break a hole into the flywheel case. So that was why my points were always getting wet! Sure enough, there was a hole about the size of my fingernail where I would never have found it! I had never seen another 349 until last Sunday when another one showed up at the trials I was riding. It was fun to trade bikes for a comparison. Mine is a 1980 with the original hydrobag rear shocks. The only thing that's missing is the airbox cover, so I've had to cobble one up until I find the pro…

Hi All, I've now half-stripped the engine to find a rusty bore, worn-out small-end and big-end. My biggest problem, however, is removing the primary drive pinion! I've broken 2 3-leg pullers so far and the damned thing still won't come off! Does anyone have the correct tool for this? Help! And, by the way, its definitely from 1979, it was registered in the UK on October 1979. Many thanks, Andrew

Hi maybe some out there can help. I am rebuilding a Cota 350, which has basically the same engine as a 349. I had the crank rebuilt and the rod used is not a Montesa original rod but a Metrkit rod which is aprox 1 mm thicker in the rod width, the base and top being the same as the Montesa rod. I recentered the crank using some of the different guaged spacers, and got everything lined up with an even distanve between crank halfs and the rod centered in the middle of the crank cases. Everything seemed ok until I put the piston and cylinder on and there is a noise as I turn the engine over. From what I can see, the connecting rod is shifted to one side as the engine turns a…

Hi, I am trying to find contact details of the Cotswold twinshock motorcycle builder, Jon Bliss I think. Thanks.

Saw mention of a new 'Cotswolds' twin shock bike built with a Jailing motor on the Pinky twin shock conversion discussion. Does anyone have any info on these bikes - who makes them? costs? any photos etc? Many thanks!

I have an old Cotton Bogwheeler that I am trying to restore. Does anyone know of any parts suppliers? Thanks Much! Retro

Hi I am starting a project with ex cotton works rider John Close the cotton mickmar trials bike and am looking for as much info on it or other minckmar trials bikes. I have been talking with Michael Martin who has given us lots of info but unfortunately he does not have and photos of the bike. We are wondering if anyone has a photo of the cotton mickmar that would help us in our project? Many Thanks Matt

I bought a brand new tank and seat for my Cota 247 ages ago but it was a bit wider than standard and so I never got round to fitting. I finally rigged up some rubber mounts and got it secured and it looks good but when I put fuel in it - it leaked from the petcock and I removed and used plumbers tape then sealant and then I had a good close look and this is what I found. I guess at some stage it has taken a knock on the petcock and now it's cracked. Suggestions please

Thought this was a great thread over on another forum. For those that find neat twinshocks on craigslist but don't have plans to buy them, maybe someone here will find the info useful. I apologise if my US location offends anyone. I don't know the equivalent of Craigslist in the UK. I'll start. A bunch of Hodaka parts bikes in Pennsylvania. https://harrisburg.craigslist.org/mcy/d/hazleton-hodaka-dirt-bike-lot/6775910399.html

Just removed crankcase of MH349 to see damage of crank, The end of crank has been all chewed up (See pics) Now the bike is just a field bike at moment and it ran o.k but what will happen if i continue to run the bike like this? I know i shouldnt but at the moment i can't track a crank down and its a budget bike for messing around on whilst i get more time/money to sort it out properly or upgrade to another bike Cheers

Can anyone tell me the correct ohms reading on my '67 T20M ignition coil? I read 1.8 ohms from ground to input lead on the secondary. (all wires disconnected). Also I would like the reading from the 5 alternator wires. I have a black/white, black/yellow, brown, brown/blue and red. I get now spark at the plug. My bike has side points and no battery. I have a repair book but it is no help. Being a positive ground system, will any other single coil work? I want to keep the stock ignition system because my bike is street legal. Thanks,

How easy is it to fit a C15 rear shinging arm to a Cub? Or another way to change the rear end to take a 400 tyre.. Thanks

Just wondered when entries close !!!! It's a trial not to miss on some great land !!!! Cheers As always The Wobbler

Curious whether anybody out there has a Yrjo Vestrerinen replica Happytime riding suit lurking in their cupboard? TFT

Does anybody know of a manufacturer who would make me a one-off base gasket. Or better still supply me with a base gasket for a Hiro 350T engine as used in the Armstrong/CanAm 320 Trial. I totally ruined mine whilst removing the barrell to inspect the piston and bore (proved to be a waste of time as they are both in good condition). The gasket itself is like a thick plastic with a fine wire mesh within, so therefore, i am not really interested in cutting a Cornflakes box to match Thanks in advance. Gaff.

Hi, I' am looking for someone that can manufacture custom made sprockets to my Panda. The bike has a Franco Morini engine, the shaft looks very similar to the one from Fantic's 125 and 200 Minarelli engine but is different in geometry. Any resources as I need just 3 sprockets with 11 teeth for a 428 chain? I have just now a used 11 teeth and a used 13 teeth which comes from a Swedish 125 Monark which had used that engine too. Left to right: - section through the front sprocket, - front sprocket 12 teeth with right shaft diameter but for 50cc Malaguti/Aspes for a Moped chain, - front sprocket 13 teeth for F. Morini with inner dimension, - front spr…

The manual says to torque the cylinder nuts on a Cota 348 from 14.5 to 18 ft lbs. My torque wrench starts at 20 ft lbs. Don't really want to have to buy another torque wrench [ another $50 ] ......... what do you guys do? Calculated *guess* when tightening? The cylinder head will be torqued 22 to 25 ft lbs, so I'm OK there.......

Anyone know the factory position of the cylinder rubber pieces on a 1974 ty 250? I should have taken a photo 3 years ago but did not. I've seen at least 3 different photos. Not a big deal but as a restoration I would like to make it factory correct. thanks.