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"In 1996, the AMA changed racing rules to allow 450cc four strokes to compete in the same racing class as 250cc two strokes" wrong? someone correct me otherwise, but yamaha developed a 400cc bike, not 450, and later in the article about the 450 there is a mention of new rules.... also, reference is to the 2006 rulebook, not the '96 one. note the ten year difference. Motorbyclist 03:48, 20 May 2007 (UTC)
If the YZ400F, YZ426F and YZ450F are all pointing to this page, should it not be renamed to something more apppropriate such as "Yamaha's big cc fourstroke motorbike" or something ??? Pickle 00:55, 23 May 2007 (UTC)
Attention yamaha MX experts, owners, etc - Is this a YZ450F or YZ250F ??? - thanks in advance Pickle 11:42, 23 September 2007 (UTC)
I don't believe an aluminum frame (pretty much an industry standard item) or returning to a 5-speed transmission constitutes a fourth generation for the YZ450. All bikes change all the time. The YZ400 is clearly generation one, YZ426 clearly generation two, but 2003 through 2009 is the same bike despite the marketing hype. The first lines of the generation 4 & 5 sections summarize it succinctly, "the biggest update" vs. "Yamaha introduced its all new". Not until 2010 is there a significant difference in the YZ450. The fuel injected rear facing engine dictates generational changes such as the intake in front of the bike, the exhaust coming out the back side of the cylinder and the tank located under the seat. These are truly generational if not revolutionary differences. I suggest combining gens. 3&4, particularly since the section on gen. 4 is tagged as too brief. Another indicator that there has been a generational shift is the fact that the Yamaha WR450F still uses the gen. 3 motor in 2011. I ♥ ♪ ♫( talk) 03:03, 25 March 2011 (UTC)
![]() | This article is rated Start-class on Wikipedia's
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"In 1996, the AMA changed racing rules to allow 450cc four strokes to compete in the same racing class as 250cc two strokes" wrong? someone correct me otherwise, but yamaha developed a 400cc bike, not 450, and later in the article about the 450 there is a mention of new rules.... also, reference is to the 2006 rulebook, not the '96 one. note the ten year difference. Motorbyclist 03:48, 20 May 2007 (UTC)
If the YZ400F, YZ426F and YZ450F are all pointing to this page, should it not be renamed to something more apppropriate such as "Yamaha's big cc fourstroke motorbike" or something ??? Pickle 00:55, 23 May 2007 (UTC)
Attention yamaha MX experts, owners, etc - Is this a YZ450F or YZ250F ??? - thanks in advance Pickle 11:42, 23 September 2007 (UTC)
I don't believe an aluminum frame (pretty much an industry standard item) or returning to a 5-speed transmission constitutes a fourth generation for the YZ450. All bikes change all the time. The YZ400 is clearly generation one, YZ426 clearly generation two, but 2003 through 2009 is the same bike despite the marketing hype. The first lines of the generation 4 & 5 sections summarize it succinctly, "the biggest update" vs. "Yamaha introduced its all new". Not until 2010 is there a significant difference in the YZ450. The fuel injected rear facing engine dictates generational changes such as the intake in front of the bike, the exhaust coming out the back side of the cylinder and the tank located under the seat. These are truly generational if not revolutionary differences. I suggest combining gens. 3&4, particularly since the section on gen. 4 is tagged as too brief. Another indicator that there has been a generational shift is the fact that the Yamaha WR450F still uses the gen. 3 motor in 2011. I ♥ ♪ ♫( talk) 03:03, 25 March 2011 (UTC)