Off-Road/MX Motorcycle Engine

The off-road motorcycle engine has evolved to be lighter and more efficient over the years, incorporating fuel injection, advanced cam designs, sophisticated lubrication and cooling methods, along with varied positioning within the motorcycle itself. We carry a number of gasket kits, water pumps, anodized plugs, intake and exhaust valves, bearing kits, hoses, and the list goes on. Get your off-road power plant dialed, or the only place you'll be going fast, is nowhere!

Shop by Brand: Pro Circuit

Camshafts Camshafts Crankshaft & Rods Crankshaft & Rods Engine Valves Engine Valves
Hoses and Breathers Hoses and Breathers Pistons Pistons Plugs, Caps, Dipsticks Plugs, Caps, Dipsticks
Radiators Radiators Torque Spacers Torque Spacers Water Pump Kits Water Pump Kits
Pro Circuit Power Valves for KX100 98-13 Pro Circuit Triga iBoost2 TPS Tool (Closeout) Pro Circuit Power Valves for KX85 02-13 Pro Circuit Triga iBoost2 for 350 SX-F 13 (Closeout)
$229.95 $195.46
Available, only 4 left Ships Fri, Jul 28 if ordered within 2hr 14min 
$126.95 $89.85
Available, only 2 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$229.95 $195.46
Available, only 1 left Ships Tue, Aug 01 if ordered within 2hr 14min 
$349.95 $236.85
Available, only 2 left Ships Tue, Jul 25 if ordered within 2hr 14min 
 
Pro Circuit Triga iBoost2 for CRF250R 13 (Closeout) FMF Snap for KX450F 12 Pro Circuit Triga iBoost2 for RM-Z450 08-13 (Closeout) FMF Snap for KX250F 12
$349.95 $236.85
Available, only 1 left Ships Mon, Jul 31 if ordered within 2hr 14min 
$99.99 $84.99
Available, only 2 left Ships Fri, Jul 28 if ordered within 2hr 14min 
$349.95 $236.85
Available, only 4 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$99.99 $84.99
Available, only 2 left Ships Fri, Jul 28 if ordered within 2hr 14min 
 
Pro Circuit Triga iBoost2 for KX250F 13 (Closeout) Pro Circuit Triga iBoost2 for KX450F 13 (Closeout) Pro Circuit Triga iBoost2 for 450 SX-F 13 (Closeout) Pro Circuit Triga iBoost2 for CRF450R 13 (Closeout)
$349.95 $236.85
Available, only 1 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$349.95 $236.85
Available, only 3 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$349.95 $236.85
Available, only 2 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$349.95 $236.85
Available, only 1 left Ships Mon, Jul 31 if ordered within 2hr 14min 
 
Pro Circuit Triga iBoost2 for RM-Z250 09-13 (Closeout) Hot Cams Complete Valve Shim Kit for 530 XC/XC-F/XC-W/XCR-W 07-10 Hot Cams Complete Valve Shim Kit for 530 SX 07-10 Pro Circuit Triga iBoost2 for 250 SX-F 13 (Closeout)
$349.95 $236.85
Available, only 2 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$75.95
May need 2-3 business days to ship 
$75.95
May need 2-3 business days to ship 
$349.95 $236.85
Available, only 2 left Ships Tue, Jul 25 if ordered within 2hr 14min 
 
Pro Circuit Triga iBoost2 for YZ450F 10-13 (Closeout) Moose Replacement Cylinder for KLX400 03-04 Moose Replacement Cylinder for WR250F 01-13 Moose Replacement Cylinder for CRF250R 10-13
$349.95 $236.85
Available, only 4 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$269.95
Available, only 5 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$269.95
Currently Unavailable
$269.95
Available, only 1 left Ships Tue, Jul 25 if ordered within 2hr 14min 
 
Moose Replacement Cylinder for KX250F 04-08 Moose Replacement Cylinder for YZ450F 10-13 Moose Replacement Cylinder for 350 SX-F 11-12 Moose Replacement Cylinder for CRF250R 04-09
$279.95
Available, only 2 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$289.95
Available, only 2 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$279.95
Available, only 4 left Ships Fri, Jul 28 if ordered within 2hr 14min 
$279.95
Available, only 2 left Ships Fri, Jul 28 if ordered within 2hr 14min 
 
Moose Replacement Cylinder for KX250F 11-13 Moose Replacement Cylinder for RM-Z250 10-13 Moose Replacement Cylinder for 250 XCF-W 06-13 Moose Replacement Cylinder for CRF150R 07-13
$259.95
Available, only 1 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$279.95
Currently Unavailable
$279.95
Available, only 3 left Ships Fri, Jul 28 if ordered within 2hr 14min 
$249.95
Available, only 1 left Ships Fri, Jul 28 if ordered within 2hr 14min 
 
Moose Replacement Cylinder for CRF450R 02-08 Moose Replacement Cylinder for CRF450R 09-13 Moose Replacement Cylinder for CRF450X 05-13 Moose Replacement Cylinder for KX250F 09
$269.95
Available, only 4 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$295.95
Available, only 6 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$289.95
Available, only 5 left Ships Fri, Jul 28 if ordered within 2hr 14min 
$259.95
Currently Unavailable
 
Moose Replacement Cylinder for RM-Z250 04-06 Moose Replacement Cylinder for RM-Z250 07-09 Moose Replacement Cylinder for WR450F 03-06 Moose Replacement Cylinder for 250 SX-F 05-12
$279.95
Available, only 2 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$279.95
Available, only 3 left Ships Fri, Jul 28 if ordered within 2hr 14min 
$249.95
Available, only 3 left Ships Tue, Jul 25 if ordered within 2hr 14min 
$279.95
Available, only 3 left Ships Fri, Jul 28 if ordered within 2hr 14min 
Products Per Page: