Personally I would fit OE, the consequences of a home made one failing are too great IMO. I had Hondas for many years CBR600RR, 900RR and found the build quality as good if not better than most, and mine had some stick. Internal parts failing are usually due to lack of maintenance, good quality...
Never used JBWeld but have used alternatives such a Belzona1111 and Devcon for non structural repairs, amazing stuff. Often wondered just how much stress it would take. Tilly819 best use a release agent on similar applications.;)
I took this bandsaw as a lockdown project, nearly finished. Intend to sell it on just to cover what it stands me at, far too big for my use, capacity 7" round, 7"x12" rectangular weighs about 180kgs+. Image attached, let me know if it would be any use to you. Will be looking for around £350...
I am still trying to understand why, when an engine is seemingly taken well over its design limits and destroyed, why would anyone try to go to the extent of trying to go to the trouble of reinforce another one in an untested way instead of using another engine make that will give as good if not...
When I had my cleaner it worked very well on motorcycle carbs, sometimes needed a couple of goes to clean out all the galleries which no amount of external cleaning & scrubbing can do.:)