On Tuesday as I said I was fitting some of the, hopefully last, batch of parts to be bought from USA.
When I first started building this machine on a NOS frame back in the late eighties my plan was to buy everything NOS as it came along but, especially pre Ebay, this was a slow task. I got NOS silencers, inner fork tubes, chain pullers, brake pedal, some cables, centre stand spring C-bracket, rear mudguard, clock wiring, front & rear hubs, swing arm spindle, rear hub torque arm and then nothing turned up for years.
I wanted to at least get the bike up on its wheels and have all the black painted frame parts so, back in the early 90"s, I conceeded I wouldn"t find these new and bought 2nd hand swing arm, centre stand, rear wheel with spindle etc, airbox, battery box etc and I think it was ?120 all in which was a lot of money to me then. Anyway a NOS rear wheel has never presented itself

and this is still on the bike along with its original rusty fittings.....
Anyway, last week I went round the rim with some Solvol and it came up fine but last night it was time to finally get rid of the second hand stand ins and put on the new odds and sods for the rear end.
old rear axle nut at forefront with second hand wheel etc behind
sprocket hub carrier nut rusty and showing chisel marks. previous owner mustn"t have had a 26mm socket
other side. chrome on spindle fine. have never came across NOS rear axle
NOS parts. 3 at top bought from USA last week. 3 at bottom bought in UK nearly 20 years ago
NOS nuts from USA exactly the same. surprising as large one had superceeded part no and small one had different part no as came from UK bike and US part no. different
rear brake torque arm has never been connected up front to swing arm bracket
view from rear with wheel etc removed. what parts required to fix arm?
this view shows different sized holes on either side of bracket
because shouldered bolt is fitted. only goes in from one side
new part fitted brake arm fine
but still something missing. parts book says 174-25374-00 SPRING, tension barnow, as I mentioned before, the whole rear wheel assebmbly with spindles, bolts etc was purchased a
long time ago from a UK seller and I have never really had reason to examine or compare the parts up to now. I have however found now that there is a mysterious part on the brake plate/tension bar stud.
The parts book advises there should be a nut, spring washer & plain washer here but my hub has a nut, a plain washer and another very thick "washer" (which looks uncannily like the "spring" for the other end in the parts list drawing). It"s more like a small collar than a washer as its so thick and has a convex face on one side.
NOS tension bar fitted to original UK brake plate on top of large mystery "washer"
same set up viewed from below mounted on bike
and again from rear
stud fittings removed from inspection - top sides.....
....and undersides
another viewI was wondering if maybe, all those years ago, the previous owner stuck the tension bar front fitting on the hub stud for safekeeping when he dismantled the bike but it seems to fit the brake plate stud perfectly so feels like it is proper to there. Then another surprise while taking the pictures....
The part number for the YCS range rear hub is
174-25311-00 and this ran right through to the RD200. I bought a NOS 174 rear hub years ago and remember thinking it looked slightly different to the hub I had. I was puzzled by this but put it down to "upates on the production tool" or "a new part that fits same purpose as old one so keeps same part no." but the other night I found the part number inside my old UK hub was
136-25311-02
original UK hub shows part number earlier than YCS range
NOS 174 hub doesn"t have full part no stamped and internal ribs are straighterAt this stage you might think "well obviously someone has sold you the wrong wheel" but its not as simple as that. The brake plate on the YCS range also has a 136 part no.
136-25321-01 and this was fitted right up the the RD200. 136 is the model number for the YA6 which dated right back to 1966

and my brake plate has the manufacturer date stamp on it but unfortunately the hub doesn"t have a stamp like this but due to the date it looks like I wasn"t sold a YA6 wheel, it seems that Yamaha were still using the 136 part right up to 1971 in some cases!
ink stamp on brake plate shows date of 46.2.27 in Japanese which is 27.2.1971 in UK That leads on nicely to another anomally. The NOS U shape centre stand spring link I bought years ago turns out to be a pretty different shape from the used one currently on the bike.......guess what its actually off/ yes a YA6

I found this out when looking at Ebay the other night and there is one pictured, exact same as mine, for YA6.
NOS centre stand spring link bought years ago not correct shape
correct one has a longer nose and less tightly curved