Agreed. I got the head and barrel's off the old engine last night. Took some swearing and beating with a large mallet as the head studs were corroded into the barrel's. The YICS chambers were full of sludge, but otherwise the engine looked rather good for having 100K km on it. I did find the remnants of a chain guide. Probably the generator drive chain guide, as it was nowhere to be seen. This would explain some of the noises the engine was making when I retired it. The local bike wreckers don't have any engines, so a rebuild is in order. I'm going to strip and clean the head before I remove the engine from the bike and tear into it. Been trying to find a gasket kit but nothing local or even on eBay in North America that ships to Canada.Not that it will matter at this point but.....a top-end rebuild is not such a big task...just sayin...get the reliable fuel injected pretty face but keep the 400 as a Tinker toy...
Just throwing this at you...
Time and parts availability may force my decision.