Aircooled Monoshocks

With the cable disconnected I have maybe 20mm of free play on the clutch arm. Am I right in thinking I need to screw the adjuster on the pressure plate in to remove this free play then back the adjuster off a half turn maybe? The biting point of the clutch is near the end of the lever travel, the friction plates look ok. Is there a stack height for the clutch plates? Cheers.

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.

Hi All, Anyone know anything about air valves on the top of my mono forks? They appear to be the same size as tyre valves. I assume they are meant for loading etc. A pal of mine says they may be majesty. Any ideas chaps?

Hi all I recently rode my air cooled gas gas for the first time. I bought as a complete bike but have had to do quite a bit so far such as fitting an 18mm kickstart shaft and a pedal and clutch case to match from a JTX model. I noticed two things in the 30 mins test. 1. It gets very hot, the tail pipe is almost too hot to touch where it exits the middle box so i wonder if the timing is retarded too far. I seem to remember they kicked back a lot but this doesn't. The second issue is the bike has quite a flat spot at 1/4 to 1/2 throttle, this may also be timing related but the bike has a noticeable induction noise. The filter box is the proper one but the lid has been d…

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…

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 guys im in the middle of sortin my ty250 mono you know that 40 quid pile i bought anyway its got a steel tank on it and its quite rusty inside and was wodering what i can do to sort it , it already has bits rattling around in the bottom and i wondered if there is anything like cure rust i can treat it with , might sound like a daft question but ive been outbid on every tank on evilbay thanks ps anyone know where i can get a tank cover?

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.

Picked up a 1986 Honda TLM200R to provide a back up to the TLR. The chassis appears good but the motor needs work. I have searched for a supplier of parts books but found nothing. Does anyone have a copy either as a file that can be emailed or a paper copy? Happy to pay for postage and copying costs. Regards, Peter.

Looking for a bit of info as to what it is really, I thought it was an Amigo 80 Now I've got the bike looking at images online I'm not sure exactly what it is. I have front disc and rear drum, 21 & 18" wheels, its fitted with a Franco Morini engine but the bore size is marked as 39mm which I think makes it a 50. Unsurprisingly it needs a new rear mudguard, I've tried the one from my Skywalker and its a spot on fit, which seems to rule it out being a Alevin as i found a reference saying they were close but not right. I've messaged Harglo to see if they have any engine spares remaining, if not does anybody know anybody else who may have spares o…

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

It's a 1984 TY 250 mono. It's got the shock with the remote reservoir. I've taken the preload to the max and wound the spring to it's tightest setting with the two locking rings. The back end bottoms out far too easily - I'm about 100kg with all my gear on. Is there anything else I can do? Does anyone do a heavy duty spring? Should I put a packer in front of the lock rings so they compress existing spring more? My guess is I'll lose some travel but it might be worth it? Should I lay off the beer and pies to lose a few kg's (I think this has to be a very last resort)? Any advice greatly appreciated.

Hi...My TY250R mono starts 2/3 kick and ticks over fine, once I kill the engine walk a section and go back to kick it over it wont start, I've tried leaving the petrol on/off but no joy, anybody else experienced similar ?

I've noticed that in the ACU Classic trials that they are using the new Scorpa air-cooled 125s and this lead me to thinking. I noticed that the bore on the Montesa RT4 and XR250 are the same. Therefore, could I use an air-cooled RT4 with an XR250 head in the ACU classic series? The engineering isn't a problem and I haven

Hi, Sorry but I cant find any of the previous postings about TYR front brake improvment by using YZ shield, Will ask any of you who have done this conversion, what year(s) of YZ front shield is working with TYR front hub? Cheers,

hi all i have just got aty 250 mono and it feels like it is riding with the choke on sluggish any ideas

I am thinking of building something a bit different, How far can you go? is the only criteria air cooled motor or is like the twinshock can of worms?? I am thinking of modern frame with c90 honda power (or lack of it) may try a little 80 gas gas or beta,

My Cota

I was just wondering if the only difference between the Ty250 and 350 is simply the engine size/bore? I can only get hold of a workshop manual for a 350, and wondered how relevant it was to my 250. Looks pretty much the same, but my friend said that once about a girl he met in Thailand...

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???