Could anyone help identify this Fantic.

Its marked as a TX250/FM250 on the engine so I know its the 125cc but it has 175 markings on the tank and side panels.

I know some people have fitted 200 (156cc) barrel to a 125 but not sure about a 175cc. Stickers show FM development (Fantic Motor development???)

Its a rear kickstart with non-conical hubs so would I be right it saying its 1979 model?

The other confusing thing is it has an alloy tank, never seem one on a fantic before so might not be original.

Any help would be really appreciated.

when roy carey was the importer of fantics in the seventies ,he asked me to build a trials outfit to test he organised a big bore conversion to give more power to pull the two of us,, the alloy tank was indeed to make the bikes legai in the uk we even had a full 210cc motor with reed valve that had loiads of grunt , the first outfit which was the same spec as yours is still in existance owned by an old friend bob manifold who now lives i canada,

Thanks for all your help!

Having removed the head yesterday I can confirm it is a 175cc. It has a lining and the diameter of 64mm.

The only problem I have now is that the carb jets have all corroded and I'm so not sure what the jetting is for a 175 as it currently has a Dellorto 24? Maybe Bill Pye is the best guy to speak to.

Thanks again.