Damaged crankcase with pictures -- FIXED
Welding is probably out but luckily you're not gluing wings onto an aeroplane. It's only a side stand, it's not holding that much weight (put your toe under the sidestand and see) and the load is compressive not tensile. I would do as others have said, run a bottoming tap down to the bottom of the holes and use 4 studs so you can engage the thread all the way to the bottom of the holes. Using Devcon (haven't used JB weld but I'm guessing it's a similar stuff?) Assemble the bits back together, having the bike supported by other means will enable you to 'feel' the joining parts and ensure they are aligned perfectly. Again I don't know about JB Weld bit I would let the Devcon cure the recommended time and then some.
 
The stud idea sounds pretty good, if you can use the broke pieces. Probably end tap those holes, and drill the treads out of the broke off pieces, and screw everything back together with JB weld or what ever, and let it set up good.
I've got a 2013 engine out of a total wreck, that has 2 of the mounting holes broke on one side. When I saw the porosity of the material, I knew welding was out of the question. Even if it were possible, it would require the engine to be stripped down to the bare block to be pre heated, to even try to get a good weld.
 
sonny said:
That is the best idea for a fix yet. Custom built kick stand bolted to frame . Great idea would work out rather well.
Click to expand...
All we need now is some enterprising soul - who also happens to have a spare frame to use as a jig and some fine engineering skills.

I can think of a couple.

The main issue is getting the angle right so the load feeds directly up through the hinge and not too much on any bolts etc. I have seen a few botched jobs on old Guzzis which, frankly, have a really dodgy side stand. 3/8" steel will bend under the load of a Guzzi - Get the angles wrong and an R3 will rip it apart.
 
Make a bracket out of 1/4" flat bar (Maybe to heavy- try 5mm) run it from front to back foot peg mounts (three bolts front - two bolts rear) over the side stand mounts (will require bends and a bit of fabrication) This flat bar goes underneath the foot peg rail - so the foot peg rail is 5mm wider - no big deal. Also repair with the JB stuff and the Stud (Fantastic idea).
Basically make a strap from the front of the foot rail to the back of the foot rail picking up the side stand bolts (now 4 studs) along the way fit side stand and ride.
 
I bow to your superior knowledge sir !
 
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