Can anyone advise me if the TY125 barrel is able to be bored out to 175cc and also can it be used for the 200cc conversion ?

O.K., I'll bite:

I have never heard of a TY125. What did I miss? Years? Number built?

Alan

Yes you did miss something. They were sold in Europe and are something of a cult bike - as are TY50s.

We didn't get any TY125s here either.

Alan,

I acquired one from Hawaii a few years ago and had it shipped to AZ. The story and pictures of the rebuild are on my "Blog" under "Just For Her". Brenda rides it round the loop while on her photo duties.

Built mainly for trail riding rather than serious trials it had a few differences and came with flashers, the stand went back on the left side like the 250A, smaller engine and carb but just like the TY175 to look at.

..... and in answer to the opening question I think you would be better off fitting a 175 barrel and piston and of course the bigger carb.

Tony