Twinshock

Is it useful to mount a Decompressor to my Montesa Cota? In your opinion, what kind of advantages I'll get? Any problems? FRANCE TRIAL has Decompressor kits (49,80e).

Hi all just come back from wrighty's show and i found a cooper bantam frame in very good condition it also came with a pair of tank stickers i was told by the seller that it was a very small concern in the late 60s early seventies . Has any one got any info at all on these bikes ??? A picture would be amazing !! .I was thinking 32mm MP forks were used ?? not sure on hubs maybe the REH used on the wassell with chrome dunlop rims . Got a very neat little alloy tank painted white with it as a job lot not sure if its the original or not ??? any help with info would be amazing . Thanks in advance Martin

Hi there, i am new to the sport and this forum, and need a bit of help: i have a 1975 ty175, and rode it the other day for the first time for a couple of hours. The engine didn't like to idle and kept stalling, which made steep descents difficult. I was low on fuel, and the problem doesn't seem to occur when the engine is cooler and just off choke. Is it just lack of 'pressure' from low fuel or something else? Also another elementary question - does the 'search' thing work on this? it keeps telling me i am using banned words (and i am not...i don't think!) cheers for your help

Been offered a Cota 247 1978......up on its toes, easy starter, good compression and running ok, sound clutch, no dragging....tidy but unrestored. I could trial this bike next weekend....if ya fussy yes you would strip n tart her up. I've had a short ride on flat grass and feels small and well balanced. What is the form on these old war horses? I know nothing about them....are spares still an issue....is there the equivalent of the most fantastic 'Mr SWM' Mr Matthews behind early Cota's offering support 'n spares? Cheers guys PS my normal ride is an SWM...the Cota felt dated but quaint against the Speedy which won't be going anywhere...the Monty would …

I am considering a twinshock bike and have it narrowed down to a TY or a KT-250. The reason for these two is availability. I figure parts will be hard enough to get so that is a concern. What positives and negatives should I be aware of for these two bikes?

How might the Montesa 348 compare to a similar period Bultaco, is the 348 a good bike to own and ride?

Not much that's newsworthy right now up here as were in the grip of winter snow at my house, there are no trials for a month or so, so I'm thinking about project bike. Just out of boredome I thought I'd post a pic from the "Hodaka Days fun trial" which will be coming up on it's third year this coming June in Athena Or. As you can see the terrain is not the most challenging thing you've evr seen. I am one of the guys in charge of laying out the sections for this event which promises to become a classic. Every year more people are building Hodaka trials bikes. The estimate for 2004 is thirty riders. With this in mind I am planning to build some sections in advance, perhaps …

Hello Everyone. New here. Now It's probably a stupid way to start my time here. But to me it's a valid question. I don't mean as in race. I mean which bike would you prefer and do you have experience on both bikes. Why I hear you ask? Well I'll tell you. My mates and I are competing in the Vintage Twinshock trials this year. In Aus. I jumped in first and bought a Italjet 350T. 1983 I think. It's greeen anyway. And heavy. 101 Kg's. My mate bought a Sherpa T 1976 250 first. When he rode my bike he liked the low down grunt. He has now bought a 1981 Sherpa T 350. A blue one. Now it weigh's 93 Kg's. I like my bike don't get me wrong. But when I rode the Sherpa T wow …

Is there any reason "NOT" to use castrol R in a unit motor with a fiber clutch, I have heard loads of different conflicting thoughts. Does anyone actually use it, It will be in a Honda single ?????

I keep blowing out headlight and taillight. I put a regulator in but no help. I am getting very strange readings from the ac meter. I am actually getting readings off the engine and frame of the motorcycle of 12v to 19 volts and it is jumping around like crazy between that voltage. I unpluged the regulator from the motorcycle but it was still bolted to it and i am getting voltage comming out of the regulator unplugged BECASUE there is voltage running through the frame. Anyone have any idea why there would be current running thought the engine and frame? I even tested the ground wire comming out of the headlight and it has 12v to 19 v comming out of it (engine running…

Has anyone here ordered from them, or is there a dealer for them? I've emailed them and got no answer. How you rate their shocks compared to Falcon and Rock shocks? The application is a TY250.

I finally have the restoration done on my '76 KT 250. Got it started and finally found the right combination of carb settings so it will idel smoothly. However, without any warning the engine starts running wide open. The only way I can make it stop is pull the spark plug and cut off the gas. It does it at irregular intervals, when it is restarted it runs fine for a while then goes wild. Needless to say, this makes it difficult to ride sections. I have checked the following, throttle cable- no kinks, no burrs, it does not drag or bind; throttle assem.- it works fine does not stick, opens and closes easily; slide moves freely in the carb body and when it runs wild …

I know this sounds wierd but ive got two ossa mars both same year mk11 250's the engine numbers are about 300 away from each other! standing from the rear of each bike looking straight down at them one has the engine offset by at least 1" to the left the other bike the engine is dead centre! what the f**k's going on with this , anyone know???

Hello, I have an old mid-70's Yamaha TY250. I am curious how to tell what year the mototrcycle is. Thanks for your help.

thanks to woody for his advice,the mods are now complete. 1. footrests repositioned. 2. swinging arm length increased by 40mm 3. shock absorbers 25mm longer. 4. forks pushed thru` yokes 10mm 5. handlebar clamps repositioned up and forwards 20mm took the bike to bracken rocks today and happily it is much better,seems to grip and turn in great,the biggest improvement is the riding position,feels more like a modern bike.

Hi all, getting all a bit muddled. Looking to get into trials after many year being a road biker. Started off thinking twinshock then something newer, after seeing what you get for your money!!! After going to a local trial near Ipswich i am thinking twinshock. I have been getting advice here and there. My dilema which is a common one is which bike! Like the Fantics till i was told last night about spares prices. Piston

Anyone seen the RTX Yamaha mono engined bike Chris Koch was pictured on in last weeks TMX news i think it was a John Bliss RTX chassis with a Yamaha ty mono engine installed? and by the looks of it a majesty tank? anyone seen it in action?

So, the Cota has a 28mm OKO carb on it (the original carb came in a bix of bits, and has a big chunk missing out of it), and I have a couple of questions ... Where can I find a rebuild kit for it? What's a good starting position for the idle screw? Where sould I route the tube that comes out of the float bowl? I seems to get pretty full of fuel for some reason, so I'm guessing the float is stuck (?) I'd really appreciate help with this so I'm not chasing my tail unnecessarily

I want to improve an Ossa MAR to run in the pre 76 class run over here. I will fit it with a Gripper 310cc engine and would like to fit a first oversize piston. Does anyone know of a source? Have you modified them in any way? For the frame this has to be the heaviest thing known to man. Does anyone sell a lighter swinging arm? Or recommend an alternative? What about footrest position? Lower and rearward, but by how much? Is laying down the shocks necessary as done on the later models? In short any advise would be welcome. Cheers. Any other mods to improve reliability or rideability would be welcome