Aircooled Monoshocks

Hi all. Just wondering what year they stopped making twinshocks and started making aircooled mono's. Or did the 2 types overlap for a while?

Hi,I have recently bought a TY250 mono as an introduction into motorcycle trials, I decided to rebuild the bike from scratch and upon stripping the engine it has thrown up some interesting modifications which I hope someone could enlighten me on. The piston is I've been told is an IT 175 at 66.5mm diameter, the rod is different, Its a 214 but possibly same length as standard. The barrel is 10mm shorter than standard and the crank throw is shorter at around 63.5 in length. There seems to be quite a decent porting job in the barrel as well. It also has a lightened flywheel. The frame no is 15. Someone told me this is an early conversion by John Shirt to build a more revvy m…

hello folks iam thinking about converting my crap front drum brake to a disc.it is my understanding that the forks and disc from a fantic will fit,can anyone tell me what model fantic i need to get the parts from. sorry if this has been posted before. cheers Pat.....

Hi All I need to make a tee bar for a Yamaha TY 250 mono to strip the forks does anyone know the size of the hexagonal IE to suit a for instance (19mm) socket not sure of size just guessing? Cheers Mike

hello there can anyone tell me where i can find a copy of a manual or owners handbook for download for a1989 250 mono cheers...........

sorry if this has been asked before ,but can anyone recommend a good place to get spares for my 89 250 mono ,,head and base gaskets,in the uk cheers pat....

Hi Guys, I was wondering if anyone has any answers for stopping the pinging or minimising it on my TY250. The motor is fresh and unmodified but it pings it head off. I beleive the original pistons had dishes in the crown ( I could be wrong) but my piston is flat. I'm using 95 octane fuel mixed at 50:1. I have tried raising the needle which improved it a little but its still doing it. I know some peoples answer will be to run it on Avgas but this is really not an option I want to do, as it is road registered and I fill it up at the servo sometimes. I have heard that removing the head gasket to reduce the amount of squish greatly reduces the pinging has anyone who has…

http://cgi.ebay.co.uk/motorcross-trials-bi...1QQcmdZViewItem Never been used! No, it's not mine.

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

Apologies for another which bike question but as most of the bikes are now nearly at least 20 years old it's a bit difficult to go out and have a go on all of them. I ride as many of the traditional trials championsip as I can on my modern bike, but as I am a long way off 40 I am restricted to a few rounds. I really enjoy the series so am thinking of getting an air cooled mono to have a go at the rest of the series. Common sense says I should go for a pinky, but are they really as competitive as one of the last aircooled monos with front and rear discs etc like a Fantic 245. I used to have a 245 and struggled for grip but I thought something like a 205 would be a g…

I have a 92 pinky mono, the rim on the rear wheel is badly corroded on the inside, as Z spokes are hard to get I want to get another wheel but with traditional spokes. Talon have their own TY hubs(using trad spokes) and could build a wheel for me, the problem is that they are unsure if it would fit the pinky. Are TY wheels interchangeable regardless of whether it's an old TY hub or a new pinky hub? thanks.

hello folks my ty250 is fitted with a ngk bp5es sparkplug is this correct? cheers Pat.....

Hello all I have just got my first ty250 mono,an 1989 model (i think) iam trying to find out what the oil /fule ratio is can anyone help ? i will be using fully synthetic oil, also anyone know of any good sites to find out the specs of the 89 model ie carb settings, oil capacities, etc cheers pat.....

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…

Hello all, Does anyone know where I could purchase a Piston Kit for 1985 ty250 .75 O/S? I am in Australia and seems to be none here... Thanks Chris

Hello new to ty's just got a 86 ty 250 mono with a couple of problems but one i can not work out when you rev the engine revs pick up slowly and throtling off revs die down gradually over 2 or 3 seconds .Have checked reeds and there is no gap, and carb slide is working opening and closing fine the cables not trapped any ideas ? thanks Adrian

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

Could do with some help identifying my 250 mono it has a nickle plated frame ,the disc break has a talon caliper

can anyone help me with this? when i apply the front brake sometimes the lever comes right back to the grip other times its fine? when i apply the front brake fully the disc moves slightly sideways? this is the point where the brake lever pulls all the way to the handlebar grip! also it moves slightly when pushed and pulled by hand as in floating? the bolts that secure the disc dont tighten fully right down so theres slight play in the disc bolt mounting holes is this normal? thanks for your replys in advance! Scotty

are they all the same? (alloy types!) do the later pinky ones fit the early ty250r bikes?