A common misconception is that the TS 400 and TM 400 cranks were different. They were both mutton leg cranks. ( Ie: Not full circle). I have a 72 TS400 J and have built and ridden TS & TM suzukis for many years. In fact I have a factory Manual that is for the TS/ TM 400. It has an exploded view of the 400 engine at the back, with dashed lines around the components that are different between TS & TM. There are dashed lines around the Carby, the flywheel & Ignition and the decompressor valve in the head, as well as first gear gears which are different TS and TM. Rest of the engine is identical. TS flywheel should go straight onto a TM Crank.