WHAT IS IT? To put it in layman’s terms, Hinson’s
BTL slipper clutch is a clutch that pulls itself in when it
recognizes deceleration. A slipper clutch is designed to
lessen engine braking, reduce wheel hop and improve
WHAT’S IT COST? $1149.99 (inner hub/pressure plate
kit), $1674.99 (basket, inner hub/pressure plate kit, fibers,
steel plates and clutch cover).
www.hinsonracing.com or (909) 946-2942.
WHAT STANDS OUT? Here’s a list of things that
stand out with the Hinson YZ250F BTL slipper clutch.
(1) BTL. The BTL acronym stands for Back Torque
Limiter. Whenever the engine decelerates, the BTL acts
as though the rider has pulled the clutch lever in. A
slipper clutch is essentially two clutches in one. The first
clutch is activated traditionally by the clutch lever. The
second clutch is activated by centrifugal force within
the spinning clutch basket. Crafted out of billet T- 6
aluminum and akadized, the BTL slipper clutch is very
easy to install.
( 2) Springs. The BTL is completely adjustable via an
interchangeable main spring, as well as a separate BTL
spring. The main spring takes the place of the conventional clutch’s coil springs. It is in charge of the clamping
pressure. The BTL spring is similar to the main spring,
but it is a much lighter rate for less clamping pressure.
The BTL spring determines how much the clutch is able
to slip. A stiffer BTL spring reduces slipping effect, while
a lighter spring provides more freewheel effect.
( 3) Freewheeling. The BTL allows four-strokes to
freewheel more than usual. Decompression braking is
( 4) Benefits. The Hinson BTL slipper can help prevent
stalling, but it isn’t a pure automatic clutch. Once the
back torque pressure is eased at low rpm, the clutch will
reengage. At this point you have to pull the clutch in
( 5) Performance. We loved it. Engine deceleration
was reduced to the point of making the bike freewheel
like a two-stroke. We were able to ride more
aggressively, because we were able to carry more
speed into corners. It is technically a clutch, but it
is more of a suspension device than an engine mod.
Throttle pull felt lighter. Hook-up was better at roll-on.
The Kayaba SSS suspension delivered improved bump
absorption, and the handling was more two-stroke-like.
Plus, wheel hop was virtually eliminated. The BTL is
an excellent suspension aid. On a side note, in the
past we complained about clutch lever surge with the
BTL, but that’s no longer the case.
WHAT’S THE SQUAWK? Price, and price alone.
The Hinson BTL slipper clutch is worth its
weight in gold. It eliminated a myriad of four-
stroke bugaboos and changed the character of
our Yamaha YZ250F for the better.
HINSON YAMAHA YZ250F BTL SLIPPER CLUTCH
MXA TEAM TESTED