Need engine swap on C50
I bought my C50 with about 27,000 in good shape. First thing I did was a fresh oil change and enjoyed the bike. I didn't realize at the time it was burning about 1/2 qt oil every 1000 miles. At the next oil change it was down almost 2 qts, oops! That may have been the beginning of a chain of events where now at 38,000 it is burning 1 qt every 300 miles with compression pressure of 90 and 95 psi in the cylinders, verified with two different testers, and running rough. I suspect most of the damage is in the heads because the compression improved only about 5 psi after injecting a tbsp of oil around the cylinders. I initially planned on doing a rebuilt until adding up the cost for parts, ouch.
Well, I found a good deal on a used engine on EBay with 12,558 miles with compression pressure in both cylinders of 195 psi. tested by the top rated seller with a positive fb of 99.8%. I plan on doing an oil and filter change, then test the compression before installation to verify. My question for all you gear heads is should I replace the crank bearings and piston rings while it is out of the bike? I feel comfortable doing the work myself, I previously rebuilt a car engine many years ago. It wouldn't add too much cost to the swap, I only paid $500 for the motor. Any other suggestions would be greatly appreciated. Thanks.