BT1000-PRO comes with replacement o-ring. PRO SERIES design is for the racer who frequently adjusts their engine. The easy-access socket head adjuster screw is perfect for tight spaces. The interior o-ring design ensures that repeated adjustments will not eventually flatten the high-performance against a jam nut.
APE'S Pro Series tensioner features an internal o-ring and custom-machined adjuster bolt. The bolt is broached with a 4mm hex.
APE manual cam chain tensioners are a must for any kind of performance riding. No matter what the engine does, the cam chain tension will remain constant. APE tensioners are CNC machined from billet alloy to exact tolerances to ensure a perfect fit.
APE manual cam chain tensioners are designed to replace the automatic and hydraulic tensioners on high performance engines. Automatic adjusters can back out when the throttle is closed suddenly at high rpm. This allows the cams to momentarily go out of time, and can result in bent valves and/or serious engine damage. Hydraulic tensioners have a tendency to put too much tension on the chain guide under high rpm/high oil pressure conditions, resulting in premature wear.
Both problems can be eliminated with the installation of an APE manual tensioner.