Worked on a bike that has not run in 15-20 years. Pulled the plugs and spun for oil pressure...... nothing. Dropped the pan and pump. Looked good, so filled with oil and all back together (few new “0” rings). Oil light went out after a few seconds. Scraped the points clean and the darn thing fired up instantly. The old HM300 pipes are disintegrating, carbs need a bit of work, tires are shot, but my friend seems to have found a nice old project bike!