Treats told me just a few days ago that the bush to use a 10mm pin in a 12mm piston does not exist.
My question to Treats followed by their response.
I have a 1986 Tomos A3 and a 50 cc Airsal kit for a Puch Maxi of a similar era (1980). I would like to fit the Puch kit to my Tomos can you please tell me what I will need apart from a 12mm internal diameter bearing for the wrist pin? I also have a 15mm Bing carburettor which came with the kit and would like to use this too if possible. Can you supply an inlet manifold which would be suitable for the Bing or perhaps a Dellorto sha15?
Thanks in advance for your help, any advice will be appreciated.
Hi Paul, You would need to change the crankshaft, cut and reweld the pipe to a different angle, and perhaps make a custom intake for this to work, so it will for sure not be worth it. I would probably get https://www.treatland.tv/tomos-A3-airsal-kit-p/tomos-a3-airsal-kit-02210544.htm plus intake and dellorto SHA instead or find a good stock A3 replacement cylinder. We may have a used one around if you want us to look. Thank you!!! Treats
Hope this clears things up, their answer is to change the crankshaft or buy their 44mm Airsal kit with a 10mm pin. The answer re the Bing carburettor was what I suspected but I had thought they would suggest the bush if the roller bearing wasn’t available as a few people have mentioned it before. If it does exist can someone please give me the part number. (edited)