Larry Brooks used experience testing with Chad Reed and James Stewart to make
modifications to prevent potential issues. Note the housing around the gas line.
Using a Rekluse Core EXP 3.0 automatic clutch on a high horsepower Yamaha
YZ450F was brilliant. It reduced engine braking and lessened rider fatigue.
contact when the chain became tight.
Reed commented that the bike would
stand up in corners with the stock
gearing/pad combination but was
more nimble with the modifications.
( 5) Case saver. Due to
clearance issues caused by the
larger countershaft sprocket, Brooks
had to make his own case saver.
Additionally, there were several
parts that radically changed how
the 2015 Yamaha YZ450F performed.
Those key items were:
Rekluse Core EXP 3.0 clutch.
The all-new Core EXP 3.0 auto clutch
is an attractive option for riders who
have issues stalling their engines in
corners; however, Brooks opted for
the Rekluse because of the freewheel-
ing benefits of the system. It nearly
eliminates engine braking and is less
taxing on the rider. L&M Racing test-
ed a Rekluse auto clutch with Josh
Hill in 2010, but they shelved the idea
because the clutch lever would pul-
sate off the starting line. Rekluse has
fixed the issue with the Core EXP 3.0.
DR.D engine relocation kit.
Although the DR.D YZ450F engine
relocation kit has been on the market
for several years, it’s still somewhat of
an industry secret. The reason? Most
people are afraid to grind away at the
engine cases and motor mounts to
install the relocation collars; however,
moving the engine 2.5mm forward
makes a big difference in handling
characteristics by putting more weight
on the front end.
DR.D radiator lowering kit.
Another tried-and-true DR.D product,
the radiator lowering kit drops the
radiators down 24mm. The lower
center of gravity, achieved by
moving the engine forward, reducing
chain torque and changing the motor
mounts, helps handling.
Bazzaz fuel controller. The Z-Fi
fuel controller, paired with the Z-AFM
self-fuel-mapping module, allowed
Brooks to fine-tune the fuel mapping
for better performance. Larry was
crafty in mounting the controller to
the subframe near the shock body for
Applied 20mm offset triple
clamps. Another factory secret,
the L&M team installed 20mm offset clamps for easier turning on the
YZ450F. The stock 22mm clamps were
ditched for Applied’s rubber/solid
We will go on record and state that
Larry Brooks’ YZ450F package was
right as rain. The combination of a
few key pieces equated to a massive
difference in performance. Most of all,
the Chaparral Motorsports Yamaha