Aircooled Monoshocks

I am rebuilding a JCM 240 Europa from the late 80s. when I was replacing the fork seals ( I believe these should be Marzocchi ) I found the internals of the 2 forks are completely different. is this normal & does anyone have a parts diagram or any maintenance info on these forks?

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

Hi All I have a TY250 Mono ( 1985) that has the original foot rests...As they look a bit small and battered I would like to know if there are any replacement pegs that could be used? Looking where the originals are mounted..it seems even if i cut them off, there s minimal space on which to weld after market hangers... Just looking to see if anyone out there has done any mods??? Thanks

Does any body have any information on the 175 Chapman-BSA which was produced in a small batch, and used the Yamaha DT175mx engine.?Any help would be very much apricaiated, i know there where only around 25 made in total. jh

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.....

Having repacked my middle box ive still got a knock on the engine it seems to knock on the top of the stroke so im totaly baffled as there is no play in the big end or small end so all thats left is the piston to replace even though it looks ok . Ive read where a dt250 or a it250 piston will fit as they are the same as a ty250mono piston but a lot cheaper if so is there a certain year for each piston that will fit any help would be appreciated as im totaly baffaled !!!

Hi does any one know where i can get a 0.75mm piston kit for my Yamaha TY250R Mono from becouse genuine yamaha 0.75mm out of stock now. cheers

Both front and rear wheels on this Mecatecno im working on have spacers inside the mag hub which hold the bearings apart when the wheel in tightened up. You know the sort , its quite common. The spacers slot inside of the bearings and stay in place that way , other wise they would rattle around inside the hub. The wheel spindle is 17mm thick. The spacers that slot into the bearings increase the internal bore diameter to 21-22mm. I need bearings with this internal bore i cant seem to find them anywhere are quite a bit of searching. My only other option is not to slot the spacers into the bearings.........but how do i keep them in place????. Any ideas Here's hoping ther…

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

Non Bikes :- who decides ? What's the criteria ? Ariel with thinly disguised betor forks - ok Belt driven diaphram clutches - ok Billet hubs & yokes - ok Replica frames - ok Twin shock a mono - ?????????

Does anyone here nows how I can get a promonty exhaust for my TY 250 ? I send a mail to promonty, but no answer.... tytrials offers some, but they want 249 for it, I found that a little bit to expensive.....

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…

Anyone out there know where can get a

I finaly found a TY Mono 250, I had a 350 a couple of years ago but could'nt pull myself to fix it ( a 350 was not what I wanted ) so I sold it for the price I had paid to someone who was locking for one. My new aquisition need some tlc but is in a fair shape, I don't want to make it a SSDT winner but a good reliable trial machine. In the serial number there is 44H so I assume it's the model, Since it's running I was able to test ride it at home and first thing that came to mind was " Am I on the second floor? " I am use to my TY A with the footrest lowered more than one inch. Now a few questions Fork oil, it says in the 350 cc manual ( the only one I could find ) 99 mm f…

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 what is the difference between the ty250 mono and the pinky version and which one would be the best to have cheers....

Hi, I'm thinking of having my Pinky shock serviced, can any one recommend someone here in the UK ? Thanks.

Hi all, I have just purchased a TY250. When it arrived the numbers indicate its actually a 1986 TY350 frame and engine bottom end with a 250 barrel and head. What are the differences in the bottom end of the 250 and 350 engines? Do they use the same flywheel weight and gear ratios? For example I thought the 350 had a heavier flywheel? Regards, Peter.

I found this video clip last week, it's awesome to see so many rare bikes in the thick of it!!! http://www.youtube.com/watch?v=He7OW8YVdX0

G'day, Just got my restored TY running. It has a new Sammy Miller's alloy silencer, but it's running too loud for my liking. They advised that repacking (more packing) could be detrimental to performance. They make 'em so I guess they're right, but I imagine there's always another view. Anyone have any thoughts on this, or advice on how to quieten the exhaust overall. I burnt out all the carbon/crud from the pipe/middle section before re-installing, so that part of the equation should be fine. Is it worth getting the middle sectioin opened up and packed, or does this harm performance, too? Just thinking about all the options. Even considered that exhaust wrapping ta…