Topic: Measurement

[bwaller]

Would anyone with a pre 77/78 CB750 swingarm provide me with the inside to inside measurement (no chain adjusters) at the rear axle mount please.

[Stev-o]

K4: approx 9.5".  Hard to get an exact measurement with wheel installed

[kmb69]

Would anyone with a pre 77/78 CB750 swingarm provide me with the inside to inside measurement (no chain adjusters) at the rear axle mount please.

Sandcast: Appears to be 243mm / 9.567"

[bwaller]

Thanks guys, my frame builder friend wanted the info & my bike is buried with the wheel in place.

[754]

Brent K7 and K8 are wider..maybe 10 mm not sure.

[PeWe]

Not the answer of the question, more info about other swingarms
K6: 240mm inside
I have a loose K2 swing arm in my garage, I'll add the width in mm later when home so this thread will be complete
See photo here of the red K6 swing: http://forums.sohc4.net/index.php/topic,107856.msg1402040.html#msg1402040

http://forums.sohc4.net/index.php/topic,106873.msg1195455.html#msg1195455
"I have a K8 it measures 9 3/8in from inside to inside just in front of the shock mount. This should be the same as a K7."

[bwaller]

I should know this but "in one ear out the other" 

The 77/78 K's arm was 10mm wider to accomodate the 630 chain. I assume the (77/78) F models used the 630 chain as well?

[754]

F and K ,as far as i know the same, there is a chance I may be able to measure both in the next 4 hrs.
I know the arms are different in the brake arm mountings.

[754]

Here is what i got, f and K are 77or 78 arm, not sure on A.
F arm 265 mm or 10 7/16
K arm 265 mm
A arm 265 mm.......................A arm has closed ends.