Big Bore Thumpers
online catalog...

Wiseco, CP, JE
HONDA
KTM
KAWASAKI
SUZUKI
POLARIS
YAMAHA

Stainless, titanium
HONDA
YAMAHA
SUZUKI
KAWASAKI

Web Cams
ATV CAMSHAFTS
M/C CAMSHAFTS

Dyna components
IGNITIONS
COILS

CP Exchange kits
PISTONS/CYLINDERS

Cutch components
CLUTCH HUBS
BASKETS
PRESSURE PLATES

M/C and ATV
HONDA
YAMAHA
SUZUKI
KAWASAKI

Cam Chain Tensioners

Adjustable Cam Sprockets


Heavy-duty cam chain

Engine Building Tools



CRF250 and CRF450 Ultimate head solution.
Stainless valve conversion w/ titanium
retainers, heavy-duty springs...
Starting at $139.95
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Manual Cam Chain Tensioners
CRF250, CRF450, DRZ, KLX
KFX, and more...
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DRZ400
Big bore piston kit and finished blocks for exchange
Athena Big Bore Cylinder Kits - New castings, with piston, pin, clips, gaskets...
CRF450, CRF250 & TRX450 Quad cylinder head kits
CRF450, CRF250, CRF150R manual cam chain tensioners
DRZ400 heavy duty cylinder stud and nut kit
CRF450 adjustable cam sprockets.
DRZ400 big bore piston kit and finished blocks in stock for exchange

Big Bore Thumpers offers complete block and piston kits for selected motors. All gaskets included. No case machining necessary. TRX450R, CRF450R, KLX400 and LT-450 Quadracer.


"Gold Stripe" Valve Spring Kit.
Heavy-duty springs, titanium retainers, spring bases

Ack Attack team sets new motorcycle land speed record.
Fast Times - Desert Racing Series blog by Team APE rider Megan Oblonsky
Team APE - our racer's support program.
 

How to install an APE manual cam chain tensioner.
Machining Services - Boring, honing, deglazing. Valve jobs, etc...
Become a Big Bore Thumpers Dealer
Become a Big Bore Thumpers sponsored racer: Team APE
International shipping
Free Big Bore Thumpers decals
Contact information

NEW CRF450 CYLINDER HEADS
Stainless valve conversion. Heavy-duty springs, titanium retainers. Completely assembled, ready to bolt on. In stock - ready for shipping.
ATHENA COMPLETE CYLINDER BIG BORE KITS
New castings with larger water jackets and thicker cylinder walls. Bored to finish size. With piston, rings gaskets, pin and clips. Ready to bolt on.
Special introductory prices - limited time.

For sales questions email us sales@bigborethumpers.com

To place an order contact the APE order desk at (661) 256-7309