feetupfun

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

Why don't you just look for yourself? I already looked once and thought the price was similar to prices for exhausts from other places.

I see Frankie Mountain sells new pipes for your bike

If you can't find a decent second hand pipe and still want to use the Feked silencer, a new front pipe for your bike would be a fairly easy thing for a tradesman to make, especially if there is your old one to copy the shape from. As a for-instance, I've seen front pipes for Bultacos and Italjets made from pre-curved architectural tubing (thin wall stainless steel handrail material) that look excellent

If you post a photo maybe someone can help

Every ride here ends with a helmet soaked with sweat. I've not yet had a trials helmet that doesn't die of rust before something else stops me using it

I have had a few Airoh trials helmets and they all suffered from rapid rusting of the metal parts even when I took precautions

yes there are replica KT250 bars available that look just like TY175 bars. Search on Fred and Debs KT parts

Trials bikes are kickstart only and don't usually have a battery

Small job either way but expensive if it's a hole in the casing

If you haven't just been riding in deep water then you probably have a leaking water pump shaft seal or a corrosion hole in the water pump housing

Thanks majesty. I know there are at least 108 of them

If I had a decompressor on my 348 I would use it to ease the piston over TDC before giving the kickstart lever the starting stroke

Don't get hung up on the front hub. The IT range had speedo drive from the front wheel and a YZ hub

https://www.yamahaty.com/english/tyusineen/majestyen.html

Slide number is usually the height of the cutaway in mm

Here's a photo of the adaptor plate I was talking about

As for your other question, yes when you use a rubber connector for the carby, you no longer need the thermal insulator piece. To seal that joint, you can use a paper gasket or machine an O ring groove or use a sealant that stays soft