SL350K1 broken lower crankcase motor mount

saffy

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Well, my dad and I bought a $250 1971 SL350K1 - I'll probably start a project log soon, it was quite the find. Right now I'm tasked with removing everything from the frame so we can get it sanded and painted.

While I was observing the locations of the motor mounts, I noticed that a motor mount on the lower crankcase (the one that would be right next to your left foot while riding) is sheared off.

Screen Shot 2020-12-27 at 6.22.43 PM.jpg

It seems that this mount on this era of Hondas is a common point of damage. I've been looking on ebay for a replacement lower crankcase and I've found a couple that would work, but they would come with the rest of the crankcase that I don't really need/want ...

Am I correct in thinking that the best course of action is simply replacing the entire lower crankcase? If so, does anyone have a lower crankcase from an SL350K1 or K2 (the K2 lower crankcase is identical to the K1, according to CMSNL, part number is 11200-312-030) lying around that they'd be willing to sell? Or could we hire someone to fabricate and weld on a new bracket?
 
The missing part of that mounting loop could be fabricated and welded on, or simply built up with weld beads....
ONLY SL 350 K1 & K2 lowers case halves will work correctly AFAIK......
 
^^^And it probably got cracked because someone lost the spacer while the engine was out of the frame
 
Thanks for the confirmation, I did want to make sure the K1 and K2 crankcases were the same. I think I'll go that route, the ebay route. Also the spacer that went on this mount is certainly lost, I'm going to see if I can find it somewhere, part number 50329286010. It seems 4into1 sells it here: https://4into1.com/ttr400-aluminum-wheel-motor-spacer-set-silver-honda-cb350-cb360-cb400f/. But, it comes in a kit of other parts that don't fit the SL...
 
IIRC, That same spacer was used on ALL the 350's.....CB/CL as well......Shouldn't be too hard to find one......
 
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