When I bought the motorcycle, it clearly had not been cleaned for years.
Engine cut out constantly in the wet.
Remedy was to spray WD40 all over the coil and HT lead. End of problem.
When this occurred for the first time, due to inexperience at the age of seventeen, I took the bike back to the dealer where I bought it. I later learned, I was charged for nothing. Don`t let them rip you off!
Gearbox often use to jump out of gear. The fault was either a defective selector claw or stopper lever.
Gearbox used to leak oil via the selector shaft. Renewed the oil seal to no success. Suspect a worn shaft. The shaft was never replaced.
Exhaust started blowing. Renewed the seal at the down pipe to muffler connection. Cost nothing.
Oil change revealed petrol contamination of the oil. This was due to blown "O" ring on the disc valve induction. This affected the top end speed, thus reducing it to 55mph.
Renewed the pads at 17000 miles. Cost £10.
Renewed the rear tyre at 18000 miles. Cost £30 and fitted by an associate free of charge.
Started running erratically. A service revealed a pilot circuit in the carb was blocked, clogged exhaust and bad ignition timing. Remedy was to overhaul and clean the carb, adjust the ignition points, and decoke the muffler. The machine was noticeably faster and easily pulled wheelies. Sounded throaty.
Loss of compression at 21000 miles due to a broken top piston ring. At this stage, I sold the bike to a person of interest, who later informed me that a new piston kit was all that was needed and no rebore.