Aircooled Monoshocks

Hi all As anyone who has owned an early Beta knows (and has scars to prove it) the kickstart is very ordinary. Has anyone drilled and tapped the kickstart shart and fitted a later model kickstart?

I'm interested in purchasing an aftermarket repackable silencer for my TY mono (DEP, WES or those sold on FEKED). I am located in California so, as such, I'm required to run a spark arrester at any OHV park. I've been going round and round on this, trying to find a solution. I'd love to find a cone screen that will fit any of these and avoid the DIY mess I may make of a new silencer. I was also thinking of sourcing a Cobra Sparky that will fit on the back end of one of these silencers (although a bit clunky looking). I'm concerned that it may not clear the rear fender as well. Can anyone tell me the dimensions of one of these oval silencers at the back (top to bottom, s…

Hi all Anyone know the torq setting for the front sprocket nut? I have online ty350 manual which covers most of what i need for my 250, but no reference to the front sprocket at all?! It does have a table of torq settings based on nut size, but it only goes up to 20mm and that’s 130Nm!! thanks

In February 2016 i spotted an ad on the net, about a day's drive away for a set of 4 (four) Japan market 1984 ty250 monos plus spares. Had to borrow a pick up and drive there and bring them back. Paid about £820 for the lot. 3 S models and 1 R model, one even a decent runner, and useful spares inc a 5th motor. 3 steel tanks, 1 plastic tank and a majority of the plastics turned to dust. Amazing what UV does...

My TK carb is just worn out on my Yamaha mono TY. I'm looking into replacing it with the old stand bye, the Mikuni VM26. I had read that Jon S. had success with these. Does anyone know the starting point jetting specs for a Mikuni VM26 for a bone stock Pinky? Thank you for your help.

Has anyone replaced or rebuilt the stock rear shock absorber on a Mecatecno Alevin?

Hi Folks, Just bought two yamaha ty 250 mono of unknown age. Bikes were bought as non running but complete. both 59N chassis id One has a steel tank with a white frame (poss originally red) it has J. Shirt on the flywheel cover and silencer, the steering lock has been cut down on that bike The other bike has a plastic tank, red frame with a dirt ground out rear link (flat where it faces rear tyre) There are differences in the frames with the red frame bike having a couple of brackets with holes on a down tube at kickstart side, the white frame bike does not have that. I could put all the best bits on one bike and keep the other for spares. I…

Hello, So i'm looking for a spare engine for my TR35 Beta (50cc) The current engine spare parts are of Unobtainium or extreme expensive. The clutch is slightly worn out and i hope it will last some time. But i like the bike! So the idea is to run the bike for the rest of the season. And rebuild the bike this winter to twinshock & install new engine. AM6 / DERBI engine. +Lot’s of spare parts +performance upgrades. +Cost of a tuned engine quite high (70cc, good crankshaft, heavy clutch) -> 300-400€ + Engine size is quite the same, some welding required -Still a 50cc gearbox -> easy to fail -Water cooled (cost of radiator, non c…

While pottering around on the dunes with my son, my bike, a gas gas 125 has decided to kill itself. While in top gear (and thankfully on a straight bit of beach) the throttle seemed to jam wide open, with no response from throttle, clutch or kill switch (once I`d wrestled it to a halt.) After continuing to scream it then rapidly died. And surprise surprise it isn`t keen on starting, just sounds horribly rattley on the kick start. So my questions to you clever people are What caused this,what`s the damage likely to be and once rebuilt how do I prevent it happening again? I had just filled it with fresh fuel containing 63ml of putoline. Thanks, Jac…

Hello It's wonderful to join you all I have a tx 240 but the disc valve came loose and jammed, I would say it's a catastrophic engine failure as the flywheel slipped, crank gears slipped, disc valve broke in 2. Flywheel previously welded on and crank taper is in bad shape. Cylinder and piston are fine and bearings all ok Where would I start looking to get a rotax 240 engine to replace my old one or part to fix her. I bought a rotax 122 engine but it would require some fabrication to work- drive sprocket won't fit its too low for the chain. We're worried about the strength of the frame if we start cutting. What alternative engines are the…

It´s been a while since i was here! I just finished my rebuild of my new Honda Aircooled Mono TLM 250R (1988). A quite rare Bike and it seems to be underrated in my opinion. I was looking for an air-cooled mono and wanted to have a disk brake at least on the front. And i was in the mood for a japanese bike again. A few days before christmas i bought this bike in really bad condition. Parts are not easy to find, but when you get a little creative a lot is possible. I managed to find a wössner piston of a 250 Rotax that was available in 74,50 and 75,00 sizes. The main difference was the 18mm Piston Pin and a different shape to the dome. …

Hi, I have a TY250 mono with a pro monty front pipe and sammy miller back box and rebored to 261cc with wossner piston, just wondering if there is a carb upgrade from the original as can not get it to run right always running on when it gets hot tried cleaning carb out I have left jetting as it was. If there is a carb upgrade where to buy one from

Some purists might be outraged by such a project. Normally I too find engine swaps to be a distasteful subject, but... after several years trying to keep from doing this, I just came home from work one day and started in on it. I guess the winter weather has effected my judgement. The front subframe has been welded together out of alloy strap material from the hardware store, and short chunks of renthall handlebar. It's very satisfying to be able to make something like that, finally having a tig welder to play with. The project has a long way to go, but should prove to be a fun ride and a great conversation starter. Also perhaps a handy excuse for lackluster finishes i…

Hi, I've just got a Mecatecno Amigo for my son and would like to know if anyone could give me any technical info such as engine type and spares availability.Thanks in advance

Thought I'd get in 1st and title the topic before some one else says it!!! This section has been quiet for ages now so I thought I'd post a couple of pics of a project I should have done by now. I've been collecting loads of parts over the past year or so, I just need to get the rest of it mocked up and fabricated then strip back down and refurbish it all. I was lucky to get one of the last 2 new mudguards in existence, I'm not going to use it though, it's too rare so I'm getting replica's made as I know I'll end up breaking it. Spot the parts that shouldn't be on the bike.

I’m thinking of building a air cooled mono. I have an extra rebuildable Rotax 280 trials engine and exhaust. Just need a mono chassis. Any recommendations?

Hi just wonderd if anyone would know where to get a front disc cover for my ty mono .it's had the 80s shirty convertion at some stage .

can someone tell me where I can buy a set?

hi ....im getting a rebore on my yamaha ty 250 mono could anyone recomend what pistons are available and what modifications if any do i need to do to make it compatible....Thanks for any replies.

When running, I've oil dripping from gear change shaft, easy fix or engine split ? Ty250s