3-2
GO
-KARTS
B
U
MPERBOAT
S
Specifications subject to change without notice - Check our website for valuable information including videos, workshop and operations manuals. www.jjamusements.com
503-304-8899
ENDURANCE CL
UTCH PLA
TES
TM
OVERVIEW
Hub & Spindle FAQ
Q: I REMOVED MY FRONT HUB AND A SPACER FELL OFF.
WHAT IS IT?
A: J&J’s 3/4-inch spindle is cut redially. The wheel bearing needs
a flat surface to work against, so a spacer is used to cover the
beveled edge of the spindle. Reinstall the spacer with the bev-
eled edge facing the go kart frame: a little bit of red or green
thread locker can be used to help hold the spacer in place.
Q: EVEN AFTER REPLACING THE FRONT HUB BEARINGS,
THE HUB TURNS HARD AND IS GOING THROUGH BEAR-
INGS QUICKLY.
A: When the bearings are replaced, it is a good idea to also replace the inner spacer that goes between them. If this
spacer becomes worn, the bearings receive too much lateral preload when the hub is tightened to the spindle. The
excess preload creates drag and causes premature bearing failure.
Front hubs and spindles: J&J pioneered the billet-machined hubs for concession go-karts. Easily-replaced lug studs are
simply threaded through the hub flange.
Sealed bearing design: two double-sealed bearings with an inner spacer make this the most popular configuration.
Tapered roller design: 1” tapered spindle and Timken®-style roller bearings and seals are used in severe conditions
and on electric go-karts where weight is a consideration. This setup requires a special hub to accomodate bearings and
seals.
The spindle is fabricated from an automotive 4x4 universal joint. It is very rugged and is serviced in the same manner
as its automotive counterpart.
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