Parts for a Top-End Rebuild
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our customers’ next 4-stroke top-end rebuild should involve inspecting the valves, valve springs, and cam chains. In some cases, they may just need to adjust the valves with an adjustment in valve shim sizes. In other cases, they will need to replace their valve train components.
ProX has everything necessary for a complete top-end rebuild that’s an upgrade over the OE parts.
Replacing and maintaining valve train components doesn’t have to involve overpriced aftermarket parts, or cheap parts that leave quality to be desired. ProX Racing Parts offers replacement valves, valve springs, and cam chains, along with the shims and seals needed for reassembly. Some 4-stroke engines come equipped with titanium valves as original equipment, but the quality can be lacking. ProX titanium valves are forged in one piece for added strength, and are Chromium Nitride coated for surface hardness and temperature resistance that exceeds OEM standards. These valves are available whether upgrading OEM titanium parts or existing steel parts.
For those who want to focus on longevity, steel valves are also available from ProX. ProX steel valves are manufactured to exact OEM specifications and tolerances, creating a more affordable, high-quality alternative. To complete that valve train freshening up, ProX steel valve springs are available to accompany both titanium and steel valves. Replacing the cam chain is always recommended when the top end is apart. A timing chain failure in a 4-stroke can be detrimental, which is why ProX has partnered up with Borg Warner in Japan to supply OEM quality cam chains. ■
»» Talk to your Parts Unlimited rep for more details and check out blog.pro-x.com.
PARTS & ACCESSORIES
Valve Train Upgrade