Aircooled Monoshocks

This has got to be rare, eh? kids Merlin

I'm freshening up the engine from my 87' garelli as been as it's never been touched since new, and not sure wether to have the cylinder replated or have a steel liner pressed in instead??? Originally the hiro engines have a plated bore!! What do people think about this???

Taken from Dirt Bike Rider, October 1986

My garelli rear silencer always had a rattle coming from the inside, so now i've rebuilt the engine i thought i should sort the silencer out??? So i've carefully cut the back off the box with an ultra slim cutting disc, and when i opened it up WOW WHAT THE HELL???? inside its got a pipe coming from the front of the box about 4" long going through a plate and then another 3 plates with small openings alternating at the top and bottom and the last plate has a short perferated pipe going out the back??? it seems quite a restrictive design to me, i was thinking about removing the plates and modifiying it to like a modern design with one long perferated pipe and packing a…

Yamaha TY 250 mono on ebay item no 260361410268. Anyone know anything about these, also mention of a new exhaust system coming out ?? Sorry I can't do link it doesn't work .

does any one know the gearbox oil quantity? i think the bottom end is the same as a cota 242 / 330

This very unique home made trials bike has recently surfaced at a local trial in Connel Washington. It was built by Frank Theim of Idaho and uses a KX 80 bottom end mated to a very customized Hodaka cylinder and head. Apparently Frank made his own frame and almost everything else!

Hi, I have just been looking at a Titanium Front pipe and Carbon Fibre Leg Guard combo for Gas Gas Randonne on the Mitani Website , does anybody know of any Agents in the U.K. or an easier way of getting hold of one without dealing with Mitani direct,Cheers Nick

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. …

A few pics of my pinky, non std tank and non std colour rear guard and seat unit (never did like the 'pink' colour scheme!!)

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…

This is when bikes were bikes.... and we fell off more A good shot of Eddy Lejuene on his Merlin DG 350 FIUS for 1988 - (where's his glasses?)

I posted a topic in yamaha forum asking if anyone knew where I could get the extended arm type clutch lightener for my TY250 but no joy, thought I would try posting it in aircooled mono forum as it seems to get a wider audience. A couple of people suggested making one but I don't have access to metal working equipment. I am sure that someone somewhere must be still make these in a little workshop as so many bikes seem to have them (except mine!) I have just finished restoring my TY back to it's former glory which I posted in the Yamaha forum recently and am looking for the clutch lightener to further improve the riding experience, and my skills!! Any help / contacts …

Can anyone tell me how the shortend reed block mod was done and some pictures if pos cheers

Having just spoken to birckett motorsports about a knock on my ty250mono it now apears it could be down to a blocked middle box.I wonded how do you go about cutting it open and has anyone done this and the knock and had good results. cheers peter.

Probably the only red 88 one in the country. Yes , parts are a little bit of a problem!

I found an online manual for the TY350 mono that says cylinder head nuts torque to 22nm. Is the setting the same for the TY250 mono? Does anyone know where I can download a 250 Mono manual? Thanks

I think this bike looks awesome . Mecatecno were such a small company but somehow out of enthusiasm rather than business sense they made their own engine entirely. The piston was shared from a Bultaco 325 and the cases are all magnesium making them very light and fragile. Unfortunately the economic crisis is Spain in the lates 80's early 90's proved too much for them. RIP

Hoping to run the mecatecno at a club trial this weekend. Just need a wee bit info confirmed by you knowlegable people. Engine oil capacity & type, 500cc 75w pji clutch tuner ? Plug type B8es ?. Mixture 50: 1. Any one know if rear wheel is the same as any other bikes ?. Any one know if rear guard is the same as any other bikes. Do these bikes normally sound fairly loud and ringy from the top end.

My clutch on my mono has bad it! I'm wondering if anyone knows if the clutch plates are the same from any other yamaha models? I don't fancy paying £58 just for friction plates. Thanks Paul