I finally have gotten around the starting work on my engine. The bike has been sitting in my dining area (I don't have a garage) for the past year or so, and I've missed an entire riding season. I don't know what I am doing, but, at this point, I figure what do I have to lose? I quit my job back in 2018 and left on a trip that was supposed to take me from Ontario, Canada through the USA, into Mexico and back again. I made it as far as New Orleans when I experienced some engine problems, and a major loss of coolant. My symptoms were: engine running at 5 bars at highway speeds (usually 4 bars) in moderate temperatures (25°C) significantly lower fuel efficiency (from fuel light on at 220 km to 180 km) noticed lots of coolant loss no signs of external coolant leaks no signs of oil in the coolant, and no signs of coolant in the oil, other than appearance of possible slight steam coming off the oil when oil cap was removed when engine was hot (was using Engine Ice, not glycol-based coolant) no wavy filter since was using a stainless steel filter Sometime over the past year and a half since the engine has been out, I performed the following: compression test, numbers look good according to others (https://advrider.com/f/threads/compression-test-question.1321937/) leak-down test (air seemed to be escaping from my intake valves) With some suggestions from @wiseblood in another thread, I will possibly be doing the following: New piston rings Maybe re-cutting of value seats in the head, and new valves (but not always) possibly a new head gasket possibly water pump rebuild new cooling system hoses and clamps Any suggestions and helped is greatly appreciated!