feetupfun

looks like the wheelbase would be a few inches longer than standard

yes

Even if they did fit, they would look very strange on a TY50, because they are made for bigger diameter wheels

also the slide looks quite worn so I'm thinking maybe the slide needle and needle jet might be worn. That would make it run too rich from about 1/4 to 3/4 throttle. Maybe you could take a photo showing the slide needle up close. You seem to be pretty good at close-up photos, if possible can you also photograph the hole through the needle jet?

There are still quite a few possibilities for what is causing the smoke. Did you work on the bike at all between your first ride (when it didn't smoke) and the second ride (when it did smoke)?

The best test for clutch slip is acceleration in top gear It is extremely unusual for a clutch to slip when the engine is working as a brake, because there is much less torque being transmitted by the clutch in a given gear when the engine is used as a brake, compared to when you are accelerating

Glenn are you sure it is the tyre that is moving? I had a tyre/wheel combo on one bike (KT250 I think) a few years ago that I tried different locks, and even put screws through the side of the rim to grip the tyre, but the tube stem kept leaning over during a ride no matter what. Because it still happened without the screws moving in the tyre bead, I figured it was actually just the tube creeping around inside the tyre. After that I got a lot less fanatical about rimlocks and have even been riding a twinshock for over a year now with no rimlocks or screws on the rear wheel - TY250D rim and Michelin X11 tubeless with a grooved rim bead seat.

I run the standard springs and preload spacers in the majesty modified TY250 frame and that seems to work fine to me. I also have a Godden Majesty 250, which carries a more weight on the front end than the Yamaha frame, and it is still fine with the cartridge emulators, standard springs and standard preload spacers. Yes 1/2 inch to 3/4 inch would certainly help. If it was me I would extend the swingarm on the TY250-framed bike by 25mm, which would make it the same wheelbase as the Godden Majesty

squirt things near the front sprocket with WD40 one at a time with a test ride in between until you find the culprit Yes it could be the bearing behind the sprocket, if the bearing inner is spinning on the gearbox shaft for some reason. The sprocket nut is meant to be tight. If it's not tight the shaft can turn inside the bearing inner. Could also be the chain adjusted too tight. The chain gets tighter when you get aboard. The WD40 will find it whatever it is

Both are hard to get some parts for so make sure they are complete The Aprilia is rare and may be seen as desirable by a collector Italjets are not rare but are not commonly seen in competition

Standard KT caps are vented. Standard KT forks also have very clever oil deflectors inside the top ends of the springs that stop oil going near the vent holes unless the bike is almost upside down. They also work fine without vent holes. I fitted TY250 caps to my KT (TY caps are not vented) because I like to tune the forks using oil volume.

guy53 and I did the TY250 Yamaha frame Majesty mods at about the same time a few years ago and yes it is better to ride (for me the benefits are more clearance under the motor and a softer rear end). On mine the footpegs were lowered back to the same height off the ground as standard (the footpeg mounts go up the same amount as the motor with the majesty mods), and it does not feel top-heavy to me in turns. Maybe if the footpeg mounts were not lowered the C of G might feel a bit high. Mine did seem to feel as if the wheelbase was a bit shorter than standard (it is actually the same wheelbase) in that it is slightly harder to manage the front end in some circumstances like when turning up hill. Because of this I would say that the majesty frame mods combined with a modest lengthening of the swingarm would probably be a good thing. I haven't done swingarm lengthening yet on that bike

Here is what I use to take that gear off

Does anyone have a photo of a bike with the standard OSSA frame converted to cantilever by Cheney?

Pretty sure the last model Alpina tank will fit ( M212/213) I have a 212 frame I could test my 198 tank on if no one knows for sure.

yes mine also has flat spots for the OSSA badges, but I trimmed the decals to fit right up against the OSSA badges so it is hard to see the flat spots

I've just put a proper MAR shifter on it the other day. The one in the photo is off some other OSSA. It fits OK but hits on things. The proper MAR one is curved up at the front - photo later I've taken a photo but am having problems getting it off my phone

It may help spread the loading to use strips of foam rubber along underneath the seat section where it bears against the frame tubes. I use the foam rubber strip that has self-adhesive along one side and is usually used for sealing doors to doorways. Also use the right thickness of packing under the tank section so that the seat part rests against the frame rails along the whole length

I used Giles' MAR MK2 decals on my fibreglass tank about 6 years ago. I knew they were made for the alloy tank, but just trimmed them carefully and I think they ended up looking very nice. Thanks for making them Giles.

could also say "rhymes with tosser"

both are right - it just depends where you live. Same with Beta, it is also pronounced a few different ways

The only thing I have found is that trials bikes with disc brakes sometimes overheat the fluid if the downhills go for a long time, or if I push too hard on the flat. Twinshock trials bikes in those sort of rides can be very good too, the bigger the motor the better so there is less gear changing

Great fun Shawn. That sort of riding on a trials bike is a blast

The TY175 kickstart lever is forged steel that has been electroplated. It can be welded with a plain steel welding rod or with a stainless steel welding rod. The hard bit in doing a weld repair on them is to end up with the hole being perfectly round and of the right diameter.

http://www.mikunioz.com/download.htm and click on VM tuning manual