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Ships within 48 hours · Estimated delivery Aug 20 - Aug 25
These top end components are the latest generation of design and investment cast for the highest quality
These heads fit the 2005-2021 YZ125s modified to a 144 by aftermarket shops like EGR
Ported for more mid to top in comparison to stock Yamaha and the exhaust bridge is strengthened for better reliability
I've converted thousands of YZ250s to big bores since I first invented this kit in 2008
These kits fit the model years of 1999-2025 YZ250
KAWASAKI KX525 BIG BORE KIT $1,350 These top end components areONLY 2 LEFT! KX525 cylinder with porting, plating piston and gaskets. Porting by Eric Gorr and plating by Millennium Technologies. Weld reinforced bridges and stainless exhaust sleeve. Fits 1989 2004 Kawasaki KX500
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