American Motorcycle Dealer AMD 181 August 2014 | Page 41

"Failsafe design"
steady-roll
tappets
PERFORMANCE V-twin engines require more
valve lift than stock designs, and this increases the
load on the tappet roller, which can lead to failure.
Tappet roller failure can cause broken needle
rollers allowing the tappet roller to deform, causing
cam lobe damage. In addition, pieces of the hard
rollers, as well as debris from the cam can easily
contaminate other parts, such as cam plates,
bearings, oil pumps, and other tappets.
In order to prevent such catastrophic damage
happening JIMS has begun manufacturing tappets
where the needle rollers are replaced with a special
bronze alloy bushing.
JIMS has invested in new machinery that controls
the hydraulic unit fitment tolerance within .00015in.
The company says that this new failsafe design
means even if the bushing wears out, it will be
initially retained in the tappet assembly.

PARTS AND ACCESSORIES

The new JIMS Powerglide Steady roll tappets are
available for use on all Twin Cams, Sportsters