Originally Posted By: userfriendly
You said it all OneEyeJack;
Yamaha, for example is the #2 brand in grand pianos, and has a 5 valve cylinder head motorcycle engine.
I wonder if the current generation know who to thank for all this technology?
Yamaha has had 5 valve head technology for quite a while. The 1998 YZ had a "revolutionary" 5 valve head, and Doug Henry won the AMA Motocross championship on it first year out. Henry was not a small guy, and it still hauled his booty faster than any one else. Yam switched from steel to Ti valves in 2000, extending the engines RPM limit past the initial 11,600 RPM for the steelies.