850 frame distinguishing features
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lcrken
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Danno said:
You'd still have the 27° rake of the 750 frame, but less trail due to the '75 fork yokes not keeping the tubes parallel with the stem. That would make the bike a little quicker to turn into corners, but less stable in high speed sweepers. I calculated the difference in trail some years back, but can't find the data right now. As I recall the change in trail is something like 6 mm.
Ken
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Danno said:
It's unusual for the frame to have them that early. Do they look like original one-piece inner plates and not additional triangular sections that could have been added (seen that before).
Does the frame have a part number stamped on the front face of the left-hand fuel tank bracket? According to the parts books, the original '73 850 frame is 06-4140, the later 850 frame is 06-5404.
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Another weird thing; the paint is the (formerly) lovely fireflake blue, but the graphics are gold with no pinstripes. Hard to fathom a machine with 4500 miles being repainted, but I guess it's possible.
With the 21-tooth sprocket, 2-bronze, 3 fiber clutch stack and bodged-up primary work, it's obviously not untouched.
With the 21-tooth sprocket, 2-bronze, 3 fiber clutch stack and bodged-up primary work, it's obviously not untouched.
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Among 850 frames, there are some differences with the welded tabs that are part of the locking system for the forks.
The John Player model frames are unique among commando frames, too, with holes drilled for the VIN plate on the frame backbone, as well as a uniquely clipped fork locking tab on the fork stem tube.
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Among 850 frames, there are some differences with the welded tabs that are part of the locking system for the forks.
The John Player model frames are unique among commando frames, too, with holes drilled for the VIN plate on the frame backbone, as well as a uniquely clipped fork locking tab on the fork stem tube.
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Danno said:
Curiouser and curiouser then.
According to my copy of the NOC Service Notes, the extended gusset plates were introduced for '1974' although I think it actually happened around mid-'73. :?
Danno said:
That does suggest it's a reasonably early 850 frame. Does it have a 60mm spine tube?
Robert_Norton said:
The 850 Mk3 frames certainly have a different type of steering lock plate.
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