Hello folks, just been in a fix.I came across this ebay post listing a RD250 air cooled transmission and claiming it to be the same as the ones used in RD400.now AFAIK both transmissions are different but the funny thing is that the splines on the main shaft seem to be the same?anyone knows what I am missing out on?
I haven't got a fiche for an early 250/350. The first 400 didn't appear until 76, so I don't know quite what you are asking ? I needed a gear set for a 400e build. I found a nice 250e set with low miles. I cross checked part numbers between 250e and 400e and they are the same. It's the primary drive gearing that differs between the 250/400. Best thing to do is find a fiche of the bikes you want to compare. You can go on the Fowlers website and cross check numbers there;
Ok so ... There were two clutch spline patterns, early and late...crossover at RD250/400C So that listing description is vague /wrong , in that that cluster is not actually 73-75 but if you had the other clutch and gear parts could be put on an early bike. From the picture alone I cannot tell if that is for C/D or E/F, and you can’t mix them, also not ideal that it’s a single cluster, would be better to change as a pair. If you need C/D clusters expect to pay £65 for both shafts from either if the two breakers. , Andy Jones or RD James.
..I need more info before I can give you the data you need, ‘convert to tz’ can mean a lot if things...TZ top end but wet clutch ? , TZ everything except the actual gears on the two clusters.... 5 min chat will close this.
Last Edit: May 10, 2020 14:10:00 GMT 1 by reedpete
I still have the 400e transmission I took out of my engine. It had corrosion on a couple of the gears, and I luckily picked up a mint low mileage set to replace rather than strip the originals down. Doesn't sound like they will match your 2/350 though