I have a tranny from a 1980 Honda CR80. The crank is seized but the tranny appears to be in good condition. I pulled the cover off to inspect the clutch and discovered the basket had some breaks. I replaced the clutch housing with an Mb5 basket which is basically the same basket, still fits the extra clutch disc CR80's had. I have done this conversion before, my bike shifts through all gears great. This is everything you need to swap into your MB5 motor. Just pull the internal gear clusters out and swap these in. You will use your MB5 balancing gear, crank shaft, and I believe the shifter shaft. I recommend you take a pic of every step to ensure you remember how it went together. I have some pics I can send to guide the rebuild.
$110 shipped to your door. i will reinstall the engine side cover prior to shipping to protect the tranny. I ship UPS and will give a tracking number. Emails please!