Looking for top end from Yamaha AS1. I think AS1, AS2, and AS3 will work. Maybe RD125 and TA125 too. Any 125cc twin vintage Yam. I can get the pistons, but haven't found any cylinders. Maybe complete motor, carbs too! Thanks peeps.
According to the specs that I found online, the Yamaha AS1 (or YAS-1), AS2, and AS3 all have the same Bore and Stoke as RD125's from '73 - '76. 43mm x 43mm. They have slightly different compression ratios and HP output, but everything else I've found looks consistent. Let me know if you stumble across any spare cylinders.