2004年4月2日 · The advantages to the 5 valve head is that it has decreased lift and duration compared to a four valve head to have the same amount of flow per unit time. Second because of the decreased lift and duration the 5 valve head has a 26,000 mile service interval compared to the 4 valve head which is approximately 16,000miles.

2023年1月10日 · In 2015, Yamaha revamped the iconic Yamaha R1, making it more track-focused. Like previous generations, the 2015+ Yamaha YZF-R1 is based on a 998cc liquid-cooled inline 4-cylinder engine with DOHC, 16 valves, and a compression ratio of 13.0:1. The 2015 Yamaha YZF-R1 retains the crossplane crank of the previous gen.

2008年3月9日 · So much so that the current large valves in the R1's 4 valve heads are actually lighter than their smaller 5 valve head predecessors from the nineties. Going back to 4 valves has allowed them a shallower valve angle in turn allowing them to reduce cylinder head dome height and increasing compression.

2006年10月10日 · The WCM (and one other) MotoGP teams that used the R1 motor as their platform took the 5-valve head off and put a VERY expensive 4-valve head in it's place. Watch, the Yamaha with the new head and VARIABLE Intake Ports will be MUCH faster than last years bike and should be considerably more competitive.

Page 33 FEATURES Hydraulic unit assembly The hydraulic unit assembly “1” is composed of hydraulic control valves (outlet solenoid valves, inlet solenoid valves, a shuttle solenoid valve, and a separation solenoid valve), buffer chambers, hydraulic pumps, an ABS motor, hydraulic pressure sensors (front brake master cylinder pressure sensor ...

2010年7月11日 · Multi valve heads I find have Extremely Higher Pitch on the flow bench, this 5 valve Yamaha was DEFINING, sounding like a whistle and moving good CFM. Here are the flow numbers for this Raptor 660R, impressive for such a small package.

2020年7月16日 · The 1998-2001 Yamaha R1 is based on a 998cc inline four-cylinder engine with dual overhead cams and five valves per cylinder. It runs a 11.8:1 compression ratio, and is fed by 4 x 40 mm Mikuni constant velocity downdraft carburettors.

2024年12月28日 · Valve clearance check and adjust on YAMAHA R1 2001. This is not a tutorial on how to adjust the valves. I made some mistakes and have no footage of the camsh...

2004年4月3日 · mercedes uses a 3 valve head, two for intake and one for exhaust. two valve engines seem to make more low end tq whereas multivalve heads breath better for high rpm, thus the saying "comming on cam". - 3 valves open a large surface area allready with a …

2020年7月17日 · The 2004-2006 Yamaha R1 is still based on a 998cc inline four-cylinder engine with five-valves per cylinder and dual overhead cams. The 2004-2006 Yamaha R1 brought with it ram air and some brake improvements (hat mean that …