feetupfun

There is a plastic toolbox that sits in the space but none of mine still have it

I had an aluminium tank that had developed a line of corrosion holes in the bottom of one side which were in conjunction with the gum that forms when modern fuel is allowed to evaporate in-situ. The corrosion holes were under the gum. I suspect that there may have been some water also present during the hole-forming process but by the time I got the tank it was dry and just had the gum and the holes. If you don't allow things like that to happen to the tank, aluminium is one of the best (longest-lasting and lightweight) materials for a fuel tank. I've seen zero corrosion damage on any other aluminium trials bike fuel tank.

nothing there on either of mine

its a right hand thread

There is nothing stopping you fitting the new outside bush further in from the end

What is the problem with the bush going right to the end? One thing I do know is that I couldn't source the right size bushes for a M85 sleeve gear last year so I bought bushing material with a smaller ID and bored it to size once it was in place in the sleeve gear. Haven't tried the motor yet. I've always wondered why some 5 speed motors have needle roller bearings there and some have sleeves.

Yes

Yes the top bend is made from a pre-formed exhaust pipe bend. They come in various diameters and one size is smaller than TY250 and the next size up is slightly bigger than TY250

The diameter is as close to standard as you can get when using pre-formed exhaust pipe bends. The vertical run has been shortened from standard to get the pipe closer to the head to provide clearance for the underside of the fuel tank.

Suggestions if you want help identifying the bike: Don't use the current fuel tank to try to identify the bike. Post up photos on the bike on here. Read and post up the frame number. Read and post up the engine number.

Sounds like you might have a few more special design features to discover yet

Looks like the fuel tank was borrowed from a works bike too

The bike photo with "Trail 70" on the clutch cover is part of a French magazine article and Trail 70 is the name of the French majesty importer. Looks like they are still in business http://www.trail70.fr/

I can't understand what you are asking here. When I open the link there are a lot of photos of different Majestys and most of them are yellow

PM sent

I don't think he has a tiger cub frame. I'll PM you

A friend of mine has some pre-65 Moto Guzzi Stornello stuff that might include frames (Central Queensland)

I'm old and "not skinny" and for the first time in 2019 I bought modern style stretchy trials riding pants and absolutely love them. Previously (for over 20 years) I wore the one set of (very tough) baggy polyester MX pants that my wife altered the waist smaller so I could wear them, or my long cotton drill work pants. These new stretchy riding pants are so comfortable I wish I'd bought them years ago. What had put me off until 2019 was that the trials supplier webpages didn't list a size that I thought would be big enough to fit my thighs and there are no trials shops around here to try anything on. Last year a riding friend who also has big legs ordered in some to try them out for size for herself and I got to try them for size too. The first size she ordered were perfect for me. What I didn't know till then is that you can get sizes bigger than what they list on their web pages. The pants I'm using are S3 brand 4XL size and my thighs are 680 mm circumference

There are photos and for sale postings when you search using Google Images. For dating your bike, if it has gold rims then most likely it would be from the same year that the bigger Italjet trials bikes had gold rims. Italjet trials bikes were only made for a few years 82 - 84 I think. I searched on "Italjet mini trials". Here's another photo

Yes the chain length effect is real, but is a separate effect to the sprocket teeth ratio effect

Yes the front sprocket takes four turns between the contacts. I said "every time the wheel rotates" which is the same thing.

Maybe it is a variation of the recommendation to avoid having the small number divide evenly into the big number, like 10:40 or 11:44. Probably not relevant to trials bikes which kill chains with grit but apparently is important for road bikes that can do massive hours on a set of chain and sprockets. The logic is that it is better to reduce the frequency of repeated patterns of tooth combination. For example with the 10:40, the same tooth on the rear sprocket is in contact with the one tooth on the front sprocket every time the wheel rotates.

My behind is of a similar disposition

Because this has turned into a voting session for OKOs, I'll put my vote in too after having great success with OKOs from Roger working perfectly on TY250A, TY250D, Cota 348 and Alpina 350 motors