1998年3月1日 · With one eye on forthcoming off-road emissions constraints, and the other on competing head-to-head with 250cc motocrossers, Yamaha’s racing division hatched the idea of a four-stroke 400cc...

2005年11月1日 · Yamaha built the YZ 400 engine based on computer modeling studies. It shares little, if anything, with its ancestors. Power is generated in the ceramic composite plated cylinder via 5 valves:...

2019年12月6日 · The Yamaha YZ400F was a true game-changer, the first 4-stroke production motocrosser that could compete directly against the 2-stroke competition — and win. The YZF weighed 250 pounds — about 20 more than the 2-strokes — but had comparable power and torque, along with the added advantage of heavier engine-braking.

2012年4月1日 · For starters, the stock engine pumps out 42 horses and does it with a red line at 11,200 rpms. A stock YZ250 puts 43 ponies to the ground but signs off before 9,000. The 400F also has almost non-existent engine braking.

2005年12月30日 · A friend of mine is looking at a 1998 YZF400. Can anyone shed some light on the history of this model? Quality, maintenance, issues, performance, etc. What kind of things should he look for as he analyzes the bike?

2006年10月28日 · Can someone please give me a brief history lesson on the YZF400. I need information like when was it made, who made it, was it made for someone in specific, stuff like that. Thanks

2020年12月10日 · This is the spot to talk about the Yamaha YZ400F, YZ426F, YZ450F, & YZ450FX. Find new & used YZ400F, YZ426F & YZ450F/FX motorcycles & parts for sale, motorcycle reviews, and browse owner garages & mods. Common Threads: Look here 1st! Mods, Maintenance, Common Issues and FAQ's. 2001 YZ426F Valves Help! 2019 yz450f valve ticking noise.. too loose ?

2012年10月11日 · One of the keys to the first YZ400F’s success was its incredible motor. Nakayama borrowed heavily from Yamaha’s extensive road race knowledge in designing the new machine’s high-tech motor. The YZF used a five-valve Genesis head from an FZR street bike and super lightweight components to give the bike a then unheard of 11,000-rpm rev ceiling.

1997年9月1日 · Yamaha’s got one and it’s as serious as a 90-foot triple-jump. It’s the YZ400F,4 available in dealerships this December. A full-blown 400cc four-stroke racebike may be shocking news, especially...

2012年8月9日 · The northwest premiere used dirt bike parts store. Quality vintage, motocross, dual sport and modern used dirt bike parts. Your dirt bike engine and part information source. Specs for 1998 Yamaha YZ400F.