SEPTEMBER 2011, VOLUME 39, NUMBER 9

ON?THE?COVER: MXA test rider Dennis Stapleton tests Ricky Dietrich’s Valli YZ450F. John Basher photo.

BIKES
WE TEST THE 2012 KTM 250SX
FIRST LOOK! 2012 YZ250F & YZ450F
WE RIDE RICKY DIETRICH’S VALLI YZ450F
WE RIDE THUMPER RACING’S YZ310F

RACES
SEVEN  UNDENIABLE MOTOCROSS TRENDS

FEATURES
SOLVING THE SOUND PROBLEM
HOW PRO CIRCUIT GOT TO 200 WINS

TECHNICAL
TEN THINGS ABOUT CHAINS
FUTURE TECH: R&D THROTTLE BODY
WRENCH TECH: INSTALLING A MOUSSE TUBE
MXA’S 2011 YZ250F PERFORMANCE GUIDE
ASK THE MXPERTS
 
PERSONALITIES
RACING LORE: MARK BARNETT
SEEING THROUGH THE FOG: BROC HEPLER
IN DEPTH: TOMMY HAHN
 
PRODUCT TESTS
BOYESEN FLEX GRIP
BIOTEAROFFS TEAROFFS
EVS CTR COOLING VEST
SHOWA A-KIT KTM 450SXF SUSPENSION
SUPER B KTM BATTERY
“MX VS. ATV ALIVE” VIDEO GAME
“TAKE IT TO THE LIMIT” DVD
XTRIG PRELOAD ADJUSTER
PRO CIRCUIT 2012 KTM 250SX EXHAUST
UNI AIR FILTER SERVICE KIT
 
REGULAR STUFF
BLACK AND WHITE: FIRST-TURN CRASHERS
TEAM TESTED: PIPES, SPROCKETS & MORE
HIT PARADE: NEW STUFF
CLASSIC IRON: 1974 MONTESA 250VR
DREAM JOBS: VALCORE, NOLTE & PETTERSSON
 
DEPARTMENTS
JODY’S BOX
MAIL ENTRIES
MOTO IN MOTION   
ON THE MAINJET
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