Moto Tassinari V307A Yamaha YZ250 YZ 250 1997-2018 VForce3 Reed Block

The unique design of the VForce reed valve system features double the reed tip surface over a conventional reed valve design. This has two major benefits: 1) The reed petals only travel half the distance as a conventional reed valve design to get the same airflow. 2) Because the reed petals only need to travel half the distance of that on a conventional reed valve design, there is a greater chance of them being fully opened as well as a better chance of sealing when they are "closed". A reed petal never truly "closes" in a classic sense, as it is always in movement. Consider this, an engine operating at 8,000 RPM results in a reed petal opening and closing 133 times in one second. This fact, sheds light on another VForce advantage. Since the petals are only traveling half the distance, they generally last longer are they receive less wear than the reed petals on a conventional reed valve design.

Features:

• Double the reed tip surface over a conventional reed valve design
• Increased bottom end, stronger mid-range and longer top-end
• Greater efficiency due to reduced reed petal travel
• More airflow means more horsepower
• Reduced reed petal wear
• Screw free design eliminates risk of screws going through motor
• Screw free design enables super quick reed petal changes

Suits VForce3:

• Yamaha YZ250 1997
• Yamaha YZ250 1998
• Yamaha YZ250 1999
• Yamaha YZ250 2000
• Yamaha YZ250 2001
• Yamaha YZ250 2002
• Yamaha YZ250 2003
• Yamaha YZ250 2004
• Yamaha YZ250 2005
• Yamaha YZ250 2006
• Yamaha YZ250 2007
• Yamaha YZ250 2008
• Yamaha YZ250 2009
• Yamaha YZ250 2010
• Yamaha YZ250 2011
• Yamaha YZ250 2012
• Yamaha YZ250 2013
• Yamaha YZ250 2014
• Yamaha YZ250 2015
• Yamaha YZ250 2016
• Yamaha YZ250 2017
• Yamaha YZ250 2018