scrambler73 wrote:
Too heavy! but still lighter than an H2 arm. I'll throw it on the scale (with added bracing and gussets) and report back later....
I STAND CORRECTED!!!! And HOLY CRAP-ified
I just threw some stuff on the scale.
This braced S-Arm when all is said and done is well over 10 lbs, which is NOT GOING TO HAPPEN on this bike.
This is a comparison of 3 Stock Triple Swingarms all in equal states no bushings, spacers, etc
S-3 Swingarm, Bone stock is 7 lbs 12oz.
Late H1 Swingarm is 7lbs 8oz.
Early H2 Swingarm is 7lbs 4oz
The S-3 Swingarm is the HEAVIEST of the three
and the H2 is the LIGHTEST!!!!!!
Most Surprising to me is that the early H2 ('72/'73) swingarm uses the same diameter tubing (34mm) and is only 1/4" longer from the center of pivot to the front of the axle slot... meaning while the H2 arm is actually LIGHTER, it is also longer and a hair wider at the pivot?? What the???
I cant see AT ALL how fitting an H2 (early) swingarm would help s-arm flexibility? Its virtually the same as the S-3 arm?
The later H2 arms have larger OD tubing I believe (dont have one on hand to check) but would need to be cut down length wise as Im not building a freaking drag bike...
This is all leading me back to another KZ650 Swingarm which uses 38mm diameter tubing....and If I remember is less than 1lb more than an early H1 swingarm (which I have yet to weigh), but still will be much less than this braced S-Arm.
The KZ650 arm was a very noticable improvement on the '70 H1, so it looks like Im heading that route now. (cause I have one..
)
what sucks now is that it is substantially wider at the shock mounts and this means either relocating original shock mounts on the frame? or upper spacers.. And then I'll once again need wheel spacers (Henry you out there?
)
ugh, stuff can never be easy can it?