91 Production model distinctions !

[kp]

We recently saw a low VIN Sandcast broken up and sold off as parts. Sad to see I agree but some interesting things regarding the 91 distinctions has emerged. We know that the VIN was 673 and the engine was 835 thus we can make some presumptions about the parts fitted
We now know that the following items were present on VINs up to 673
no indent 2 hole airbox
short screw fitting to speedo/tacho cables
no on/off castings on control switch
Has anyone picked up on other identifiable items we can update our list with
I know the engine had the early pad (I think) but I believe there is known to be later engine numbers with the early pad
Thoughts 

[Jenks137]

53.  wiring harness.  On my 3652, the original wiring harness is marked on the white cloth as {300-0400}  this is beyond 3479 as mentioned in item 53.

[kp]

53.  wiring harness.  On my 3652, the original wiring harness is marked on the white cloth as {300-0400}  this is beyond 3479 as mentioned in item 53.

My understanding is that the 040 harness was on all sandcasts and early diecasts. Chris will be able to shed light on this

[markb]

My 12xxx diecast had a 040 wiring harness.

[kp]

There's our answer

[markb]

Can anyone explain #48. narrow counter shaft, E1-E3527?  What am I looking for?
Thanks,
Mark

[Steve Swan]

vernacular of parts description in #48 probably needs to be changed.  

pretty sure the part actually being referred to in #48 is 23520-300-000, is the final driven shaft which the drive sprocket attaches to (commonly referred to and erroneously in this case, as counter shaft sprocket.)

at 3527, pn 23520-300-000 was superceded to 23520-300-010 to accommodate the wider drive sprocket, hence a more narrow shaft area the wider sprocket fits on.  

fwitw, seems we have 3 gear shafts in trans.  1.  final driven, 2.  main, 3.  counter.  the counter drives nothing to the outside.  the main drives the clutch.  the final driven drives the front engine sprocket to rear wheel.  (again, final driven is the shaft referred to in #48.)

[markb]

Distinction #72 goes from engine 1-219.  The head on the early plug is about 16.5mm diameter and the later plug is about 18.5mm diameter.

[markb]

68. sandcast cam carriers, oil pump, clutch center spider, gearshaft bearing housing, E1-E338

In distinction #68, is the clutch center spider #2 or #8 in the diagram?
Also, my oil pumps for E97, E1490 & E1789 appear to be the same except for numbers that are stamped on the housings.  Is there another distinction?
I'm not trying to be a pain but as I'm getting #97 back together I'm trying to make it as correct as possible.  

[Steve Swan]

i'm going with #2 is the "spider" noted in #68....  "spider".........    how did i come up with that one.  will get in "distinctions" to add and amend accordingly.

i would have to say the different numbers on the oil pumps may or may not be distinctions.  even tho the pumps are the same, the numbers are different....

Mark, do the numbers on the pumps get larger on the higher vins ?  i wonder if, say for example, E99 or E101 had a number on their pumps same as E100.  Or was it different... ?  Would be interesting to know the significance of the numbers.... Were these numbers assigned to the inspector who passed the pump to be then used for assembling an engine... ?

i guess we'd need to know the significance of the numbers.  if batch related, then one would think earlier vins had smaller numbers.  if inspector related, then the numbers would be random, higher vins lower pump numbers and visa versa.  i guess a way to perhaps conclude if the some of the pump numbers were same on different pumps, would be an inspection number.  if pump numbers get higher as vin numbers get higher, then batch numbers ?  at any rate, one could think a number was stamped on an oil pump to indicate an individual pump or a batch of pumps passed inspection....

Mark, what are the numbers on your pumps according to vin ?

[markb]

i'm going with #2 is the "spider" noted in #68

That's good then.  I couldn't find any differences between early and later clutch lifter plates (#8) but the clutch centers (#2) are definately different.  According to the parts manuals the early version (what I call a three piece - center, plate and retaining ring) was used on E1-1759.  Another difference is that one of the seven friction discs is different.  It has shorter tabs to fit in the outer ring (which makes the outer ring different too).  Could this be considered another distiction?

[Steve Swan]

I'd consider different outer ring being a distinction.

[markb]

Mark, do the numbers on the pumps get larger on the higher vins ?  i wonder if, say for example, E99 or E101 had a number on their pumps same as E100.  Mark, what are the numbers on your pumps according to vin ?

You can check out the numbers here:
http://cb750sandcastonly.com/smf_forum/index.php?topic=1084.msg7703#msg7703

[markb]

What is #38?

38. no casting divots at crankcase base of #4 cylinder hole

This must be the upper case.  Should I be looking at the top or the bottom?

[kp]

Hope this isn't in the list yet as I'll look like dick head.
The left side horn mount was welded directly to the ???bracket found on the early bikes. This is the bracket people say was fitted for a steering damper which never was. The bracket was discontinued after about VIN1000 or so. Bikes without the bracket had the mount welded to the frame. We there ya go Jimmy  ................ KP