Budget Big Bore KitsComing Soon! Stock bore performance packages.
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Max Power Inc. offers the largest selection of big bore kits for motorcycles and ATV's anywhere. Home of the Ice Cube cylinder. Max Power has Big bore and stroker kits available for both 2 stroke and 4 stroke engines. We are also your one stop engine performance shop selling stock displacement performance modifications, high compression pistons, Hot Cams, Web Cams, Athena big bore kits, Hot Rods stroker crankshafts, Rossier exhaust systems, Jardine exhaust systems, Leo Vince exhaust systems, Wiseco pistons, CP Pistons and Cometic gaskets. Max Power Inc. also offers full service cylinder head work including porting and oversize valves. Max Power also has an in house cylinder plating facility performing nickel silicon carbide re-plating with Apticote 2000 , cylinder porting, head modifications, stroker crankshafts and crankshaft balancing are available too.
Each budget kit is backed by the same MAX POWER customer support as every other kit we sell.
You may find similar products elsewhere, but you won't get close to our level of tech support ANYWHERE
| $549.95 | "Bolt On" - Includes Cylinder |
| $849.95 | Installed and Blue Printed |
CRF270R/X STEALTH Specifications: |
Fits 2004 - 2008 CRF250R/X |
| Bore: Yes | Stroke: No | Actual Displacement = 269cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarket big bore cylinder | ||||
| Fuel Required: | 91 octane | ||||
| Piston: | Wiseco Piston | ||||
| Gaskets: | Top end gaskets included. | ||||
| Crankcase/Head: | Requires case machining - instructions included | ||||
Click Here to order this kit now!
CRF277R Stealth Big Bore/Stroker
| $959 | "Bolt On" - Includes Cylinder and Crankshaft |
| $500 | Optional Install and Blue Print |
CRF277R STEALTH Specifications: |
Fits 2004 - Current CRF250R |
| Bore: Yes | Stroke: Yes | Actual Displacement = 276.71cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarket cast cylinder with nickel plating | ||||
| Fuel Required: | 91 octane | ||||
| Piston: | Wiseco Piston | ||||
| Crankshaft: | Aftermarket Stroker crankshaft | ||||
| Crankcase/Head: | Case Mods Required - Click here for details | ||||
Notes: Crankshaft balance highly recommended - Add $250
Click Here to order this kit now!
| $ 549 | "Bolt On" Kit includes cylinder |
| $849 | Installed and blue printed |
CRF488 STEALTH Specifications: |
Fits 2002-2008 CRF450R |
| Bore: Yes | Stroke: No | Actual Displacement = 487.73cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarket cast cylinder with nickel plating | ||||
| Fuel Required: | 91 - 110 octane - Options Available | ||||
| Piston: | CP or Wiseco Piston Max Power Extreme Coated - Options available | ||||
| Head: | No modification required | ||||
| Crankcase: | No modification required | ||||
Click Here to order this kit now!
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| Motocross Action Magazine, May 2005 |
| $849-REDUCED!! | "Bolt On" - Includes Cylinder |
| $300 | Optional install and blue print |
CRF498R ICE CUBE Specifications: |
Fits 2002-2008 CRF450R only |
| Bore: Yes | Stroke: No | Actual Displacement = 497.54cc |
| Engine Modifications Included: | |||||
| Cylinder: | Billet Aluminum cylinder plated with Apticote 2000 Ceramic coating | ||||
| Fuel Required: | 91 octane | ||||
| Piston: | Wiseco Piston Max Power Extreme Coated | ||||
| Crankshaft: | Stock | ||||
| Crankcase/Head: | No modification required | ||||
Click Here to order this kit now!
CRF523R ICE CUBE Big Bore/Stroker
| $1595-REDUCED!! | "Bolt On" - Includes Cylinder and crankshaft |
| $500 | Optional install and blue print |
CRF523 ICE CUBE Specifications: |
Fits 2002-2008 CRF450R Only |
| Bore: Yes | Stroke: Yes | Actual Displacement = 522.37cc |
| Engine Modifications Included: | |||||
| Cylinder: | Billet Aluminum cylinder plated with Apticote 2000 Ceramic bore coating | ||||
| Fuel Required: | 100 octane | ||||
| Piston: | Wiseco Piston | ||||
| Crankshaft: | Aftermarket Crankshaft | ||||
| Crankcase/Head: | No modification required | ||||
Click Here to order this kit now!
| $549 | "Bolt On" -Includes Cylinder |
| $879 | Installed and Blueprinted |
TRX480 STEALTH Specifications: |
Fits 2004-2005 TRX450R |
| Bore: Yes | Stroke: No | Actual Displacement = 478.86cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarket Cast Cylinder with nickel plating | ||||
| Fuel Required: | 91 - 110 octane - Options Available | ||||
| Piston: | CP Piston Max Power Extreme Coated | ||||
| Head: | No modification required | ||||
| Crankcase: | No modification required | ||||
Click Here to order this kit now!
TRX501 Stealth Big Bore/Stroker
| $1087 | "Bolt On" - Includes Cylinder and crankshaft |
| $1587 | Installed and Blueprinted |
TRX501 STEALTH Specifications: |
Fits 2004-2005 TRX450R |
| Bore: Yes | Stroke: Yes | Actual Displacement = 501.03cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarket Cast cylinder with Nickel plating | ||||
| Fuel Required: | 91 - 110 octane - Options Available | ||||
| Piston: | CP Piston Max Power Extreme Coated | ||||
| Crankshaft: | Aftermarket stroker crankshaft | ||||
| Crankcase/Head: | No modification required | ||||
Notes: Crankshaft balancing highly recommended - Add $250
Click Here to order this kit now!
TRX 491 Stealth Big Bore/Stroker
| $1059 | We Modify your cylinder |
| $75 | Exchange Cylinder |
$1320 | "Bolt On" - Includes Cylinder and Crankshaft |
| $1559 | Optional Install and Blue Print |
TRX491 STEALTH Specifications: |
Fits 2006-Current TRX450R |
| Bore: Yes | Stroke: Yes | Actual Displacement = 490.29cc |
| Engine Modifications Included: | |||||
| Cylinder: | Bored plated with Apticote 2000 Ceramic coating | ||||
| Compression: | 13:1 | ||||
| Piston: | Xtreme coated piston | ||||
Head: Crankshaft: | No modification required Aftermarket stroker crankshaft | ||||
| Crankcase: | No modification required | ||||
Notes: Balancing the crankshaft is highly recommended. Add $250
Click Here to order this kit now!
| $550 | "Bolt On" - Includes Cylinder |
| $850 | Installed and Blue Printed |
KX270F STEALTH Specifications: |
Fits 2004 - 2008 KX250F |
| Bore: Yes | Stroke: No | Actual Displacement = 269cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarket Cast cylinder with nickel plating | ||||
| Fuel Required: | 91 octane | ||||
| Piston: | Wiseco Piston | ||||
| Gaskets: | Top end gaskets included. | ||||
| Crankcase/Head: | No modification required | ||||
Click Here to order this kit now!
$549 | "Bolt On" Kit - Includes Cylinder |
| $849 | Installed and blueprinted |
KFX435 STEALTH Specifications: |
Fits 2003-2008 Suzuki LT-Z400, DR-Z400, Kawasaki KFX400 and Artic Cat DVX400 |
| Bore: Yes | Stroke: No | Actual Displacement = 434.43cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarket Cast Cylinder - Nickel Plated | ||||
| Fuel Required: | 91 Octane | ||||
| Piston: | CP Piston | ||||
| Head: | No modification required | ||||
| Crankcase: | No modification required | ||||
Click Here to order this kit now!
KFX 470 Big Bore/Stroker STEALTH
| $999 | "Bolt On" Kit - Includes Cylinder and Crankshaft |
| $1499 | Optional Install and Blue Print |
KFX470 STEALTH Specifications: |
Fits 2003-2008 Suzuki LT-Z400, DR-Z400, Kawasaki KFX400 and Artic Cat DVX400 |
| Bore: Yes | Stroke: Yes | Actual Displacement = 469.13cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarked Cast cylinder - Nickel Plated | ||||
| Fuel Required: | 91 Octane - This is a budget kit we do not offer race fuel compression ratios. | ||||
| Piston: | Custom CP Piston Xtreme coated | ||||
| Crankshaft: | Aftermarket stroker crank | ||||
| Crankcase: | No modification required | ||||
Notes: Balancing the crankshaft is highly recommended. Add $250
Click Here to order this kit now!
| $550 | "Bolt On" - Includes Cylinder |
| $850 | Installed and Blue Printed |
RM-Z 270 STEALTH Specifications: |
Fits 2004 - 2006 RM-Z250 |
| Bore: Yes | Stroke: No | Actual Displacement = 269cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarket Cast cylinder with nickel plating | ||||
| Fuel Required: | 91 octane | ||||
| Piston: | Wiseco Piston | ||||
| Gaskets: | Top end gaskets included. | ||||
| Crankcase/Head: | No modification required | ||||
Click Here to order this kit now!
DRZ & LTZ470 Big Bore/Stroker STEALTH
| $999 | "Bolt On" Kit - Includes Cylinder and Crankshaft |
| $1499 | Optional Install and Blue Print |
DRZ & LTZ 470 STEALTH Specifications: |
Fits 2003-2008 Suzuki LT-Z400, DR-Z400, Kawasaki KFX400 and Artic Cat DVX400 |
| Bore: Yes | Stroke: Yes | Actual Displacement = 469.13cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarked Cast cylinder - Nickel Plated | ||||
| Fuel Required: | 91 Octane - This is a budget kit we do not offer race fuel compression ratios. | ||||
| Piston: | Custom CP Piston Xtreme coated | ||||
| Crankshaft: | Aftermarket stroker crank | ||||
| Crankcase: | No modification required | ||||
Notes: Balancing the crankshaft is highly recommended. Add $250
Click Here to order this kit now!
DR-Z & LT-Z 470 Big Bore/Stroker STEALTH
| $999 | "Bolt On" Kit - Includes Cylinder and Crankshaft |
| $500 | Optional Install and Blue Print |
LTZ & DRZ470 STEALTH Specifications: |
Fits 2003-2008 Suzuki LT-Z400, DR-Z400, Kawasaki KFX400 and Artic Cat DVX400 |
| Bore: Yes | Stroke: Yes | Actual Displacement = 469.13cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarked Cast cylinder - Nickel Plated | ||||
| Fuel Required: | 91 Octane - This is a budget kit we do not offer race fuel compression ratios. | ||||
| Piston: | Custom CP Piston Xtreme coated | ||||
| Crankshaft: | Aftermarket stroker crank | ||||
| Crankcase: | No modification required | ||||
Notes: Balancing the crankshaft is highly recommended. Add $250
Click Here to order this kit now!
| $550 | "Bolt On" - Includes Cylinder |
| $850 | Installed and Blue Printed |
YZ/WR270STEALTH Specifications: |
Fits 2001 - Current YZ/WR250F |
| Bore: Yes | Stroke: No | Actual Displacement = 269cc |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarket cast cylinder with nickel plating | ||||
| Fuel Required: | 91 octane | ||||
| Piston: | Wiseco Piston kit | ||||
| Gaskets: | Top end gaskets included. | ||||
| Crankcase/Head: | No modification required | ||||
Click Here to order this kit now!
YZ277F Stealth Big Bore/Stroker
$1199 "Bolt In" Kit Includes cylinder and crankshaft $1699 Optional Install and Blue Print
YZ/WR 277F STEALTH Specifications:
Fits 2003 - Current YZ250F
Bore: Yes Stroke: Yes Actual Displacement = 277.44cc
Engine Modifications Included: Cylinder: OEM cylinder bored and plated with Apticote 2000 Fuel Required: 91-100 octane - Options Available Piston/Crankshaft: CP or Wiseco Piston - Aftermarket stroker crankshaft (Balance recommended Add $250) Gaskets: Gaskets necessary for install. Crankcase/Head: No modification required
Click here to see the dyno chart
Click Here to order this kit now!
YZ/WR 277F STEALTH Specifications:
Fits 2003 - Current YZ250F
WR / YZF / YFZ 478 Stealth Big Bore
| $549 | "Bolt On" - Includes Cylinder |
| $850 | Installed and blueprinted |
YFZ, YZF, WR 468/478 STEALTH Specifications: |
Fits 2004-2008 YFZ450, 2003-2005 YZF, 2003-2006 WR |
| Bore: Yes | Stroke: No | Actual Displacement = 467.66(04-05 YFZ) 478.23cc(06-08 YFZ, 03-05 YZF, 03-06 WR) |
| Engine Modifications Included: | |||||
| Cylinder: | Aftermarket Cast cyliner with Nickel plating | ||||
| Fuel Required: | 91 - 110 octane - Options Available | ||||
| Piston: | Wiseco Piston or CP Piston - Max Power Extreme Coated Add: $40 | ||||
| Head: | No modification required | ||||
| Crankcase: | No modification required | ||||
Click Here to order this kit now!
YFZ/YZ/WR491 Stealth Big Bore/Stroker
| $970 | We Modify your cylinder |
| $1045 | Exchange Cylinder |
| $1280 | "Bolt On" - Includes Cylinder and Crankshaft - Additional charge for 06-08 YZ/WR Cylinder |
| $1470 | Installed and Blueprinted |
YFZ/WR/YZF 491 STEALTH Specifications: |
Fits 2004-2008 YFZ450, YZF450, WR450 |
| Bore: Yes | Stroke: Yes | Actual Displacement = 490.68cc |
| Engine Modifications Included: | |||||
| Cylinder: | OEM Cylinder bored and plated with Apticote 2000 Ceramic coating | ||||
| Fuel Required: | 91 - 110 octane - Options Available | ||||
| Piston/Crankshaft: | Wiseco or CP Piston - Max Power Extreme Coated / Aftermarket Stroker Crank - Balance recommended - Add: $250 | ||||
| Head: | No modification required | ||||
| Crankcase: | No modification required | ||||
Click Here to order this kit now!