Aircooled Monoshocks

Just bought a 1989 gas gas 250, it needs a bit of tlc but not sure where to get them, I need fork seals and the front brake caliper is seized so may need a new one ( brembo), also general items such as air filter,brake pads and also is there a parts of service manual out there for this type of bike. Any help would be great, tried main gas gas dealer but dont seem interested.Anton

My little project that has kept me busy over summer - cheers.

Hey All , Got a project coming coming my way from my Buddy's ( whose passed away ) Son , to get the Ol' girl running again . Apparently needs a kick start shaft for starters ( no pun intended ) . Couple questions . Wasn't that a 1987 model and where might be the best source here in the States ? Any worthy mods anyone might be aware of ? Cheers ,

My 84 Yam TY 250 mono has Z spokes with the gold colored rims. There is some lateral runout of about 7mm over 30 deg of the front wheel. How are these wheels for truing? I've never tried truing a Z spoke wheel before. Also, is there a wheel from another bike......newer perhaps, or from another model of Yamaha or other make that would work on the ty 250? Wondering if replacing the whole wheel is any option at all? Cheers.

Been noticing that there are a few after market shocks available for the TY250R. Rock shocks, Hagon and now even an Ohlins unit from CTC. Anyone fitted any of these and come to any conclusions on them? My original shock is okay so I'm not needing a replacement, just wondering about whether the performance is much better and what the weight saving is. Cheers Hoodie.

Hummm I just picked up a ty mono 350 1986 that need tlc ( and love ) but I'm not sure I made the right decision to go for that 350, it seem's that a 250 would have been the way to go. Any advise, I'm very confuse. Guy

Just wondering what ratio people run ty 250 monos on? Manual says 50:1 or 80:1 depending on brand. Also I was thinking of running fully synthetic if there's any advantages?

TY350, sat open out in the weather for a bit, crank is stuck transmission is free, I have the rest of the parts minus the wrist pin. Bore and piston are perfect. If it's worth rebuilding I'll send it to B&J Racing, just looking for opinions.... I know, it's a crime but I'm not the one who did this!

After buying a 1989 jcm europe of ebay that was running and just sounded like it had a bit of piston slap i have striped it and found the piston smashed to bits which has wiped out the barrel lining and head .I have managed to find another barrel and head second hand but can not find a piston anywhere !! i am now thinking it might be easyer to find elvis ! Anyone any idears ??????

hi can anyone let me know where to download or purchase a manual or parts diagrams for the ty250 monshock or pinky thanks

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. …

It looks like all the previous TR34 owners have upgraded or broken their bikes as they have stopped asking questions! Therefore it is my turn to ask a newbie question. I've not done an oil change on my 1989 TR34 yet and I have no idea what oil to use. Reading other threads has left me bamboozled. I know I need 800cc gear oil as it states this on the Beta website. What is the best grade oil as I don't have to worry about having a Beta with a dodgy hydraulic clutch? Also I'm currently using up an old Motul 2T oil at about 70/1 with the expensive shell high octane petrol. The trusty Beta website says I should use Semi Synthetic so I was looking at either the PJ1 or Si…

Taken from Dirt Bike Rider, October 1986

Hello there, I cut a small piece out of the back of the box for a look-see and it is a real mess of packed solid gunge and carbon. I've seen the very helpful pics from Searay175 on 03/11/16 (attached) but can't quite figure out the best place to cut the rear end of the box. There doesn't seem to be a lot of space to cut between the outlet and the mounting bracket like he did and it looks like that would be a real pain to weld up again. Any words of wisdom would be greatly appreciated.

I have just collected my latest toy a JCM Vega which looks very original but has not run for a very long time judgeing by the state of the tyres. Any hints and tips on how to set up modify them? I think it has the 330 engine but need to lift the head to be sure.

Hi, Was NVT175 sold as a trials- or a MX bike? http://cgi.ebay.co.uk/Norton-Villiers-Triu...=item2c535b8901 cheers,

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

Hi, I'm considering a 1985 jap import TY 250 Mono, just wondering what peoples thoughts are on these, any pros cons or things tor look out for? This has the autolube fitted, is this system easily removable, being an import are their any specification changes to be aware / wary of? Cheers!

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…

can someone tell me where I can buy a set?