
Manufacturer reference: 40-40120 — Brand: KIBBLEWHITE
Kibblewhite valve guide in C674 bronze, designed for maintenance and restoration work on motocross cylinder heads. This manganese bronze guide is softer than the premium C630 references, making it easier to bore and finish with a ball hone. Made in the USA and machined to the same strict KPMI® tolerances, it provides a reliable solution for replacing or refurbishing intake and exhaust valves on off-road machines.
Ideal for motocross enthusiasts and mechanics performing reboring on a bench or on the track. This guide is particularly suitable for cylinder heads of KAWASAKI KX 250 F models (KX250Z 2016, KX250Y 2012, KX250X 2010), among other machines. Note: C674 material offers easier machinability but lower durability compared to C630 nickel-aluminium bronze guides.