KX70 RM70 National Big Bore

Please call to order 608-842-0680 Price : $449   KX/RM 70 Big Bore Specifications: Fits 2000 to Current KX/RM 65   Product Description Bore: 46.5   Stroke: 41.6   Actual Displacement = 70.65 cc Engine Modifications Included: Cylinder:  Bore, Port and Plate. Head: Re-chamber to work with the big bore piston. Parts:  Wiseco piston kit, top end bearing, and necessary gaskets. Notes: This kit requires you to send us you top end for modification. This is a great kit that we mostly sell to the KX65 ATV national classes.   The KX70 big bore increases the power across the board so it is not just all top end.  It has a much stronger bottom and mid for grabbing holeshots and provides something if the rider falls off the pipe or misses a shift. The KX70 uses a shelf stock Wiseco piston kit so they are readily available anywhere.   However if you buy the Wiseco kits from us we keep them in stock and sell them to you for dealer cost. This kit is not really slower than the stroker engine we offer it just delivers the power differently.  It is more entry rider friendly and a good choice for kids that are fast but just new to the shifter...

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KX70 RM70 National Stroker engine build

Please call to order 608-842-0680 Price : $1,199   KX/RM 70 Stroker Specifications: Fits 2000 to Current KX/RM 65   Product Description Bore: 44.5   Stroke: 45   Actual Displacement = 69.98 cc Engine Modifications Included: Cylinder:  Port Head: Re-chamber to work with the stroker crank. Crankshaft: Stroked and balanced. Crankcase: Modified to clear stroker crankshaft. Parts:  Wiseco piston kit, top end bearing, and necessary gaskets. Blueprint: Calculate deck height, squish clearance, trapped volume, port timing and compression ratio and list on your permanent Spec-Sheet. Notes: This is a complete engine build and requires you to send us your entire engine for modification, with kickstarter and shifter. Notes: Prices listed are to install stroker kit parts in good condition engine.  Should your engine need a re-plate or rebuild parts there will be additional charges. We will call for approval before we install any parts that will have additional charges. (example: rod kit, mains, main seals, trans parts) This is the best kit we offer for the KX65 ATV national classes.   The KX70 stroker increases the power across the board so it is not just all top end.  The stroker crank gives it torque out of the hole  for grabbing holeshots and provides something if the rider falls off the pipe or misses a shift. The KX70 uses a shelf stock KX65 piston kit so they are readily available anywhere.   If need be you can also use an OEM piston kit.   However if you buy the Wiseco kits from us we keep them in stock and sell them to you for dealer cost. If you really want more check out the KX76 cc big bore / stroker.  Those are the fastest thing we offer for the KX65. They use the same bottom end as the KX70 but top ends are bigger and make even more power.  We can easily set up an additional top end at the same time.  Just...

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Suzuki RM280 Big Bore/Stroker

Please call to order 608-842-0680 Special Price: $1,895.00   Max Power RM280 Big bore stroker engine build. Fits 2003-2007 RM250   Product Description This is the big bore and stroker build that we offer for the 2003-2007 Suzuki RM250. 280cc is what we have found to be the most effective bore/stroke combination for 250cc engines. Like our other 280cc 2-stroke engine offerings this one also has a very big bottom and mid that can be used for pretty much anything, however it also does not stop pulling till after most guys shut it off. It is a very linear power curve that lends it self better bike control and faster lap times. We set it up to run on 100 octane but since we customize everything here it can be altered for straight race fuel or premium pump fuel at your request. The price is to install it in a good condition engine. If additional parts are needed outside of the parts included in the kit we will call you for approval....

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ATVA Schoolboy Jr. Open – 300cc Big Bore/Stroker Engine Kits

Max Power has been refining our big bore and long-rod stroker engine packages for the ATVA National Schoolboy Jr. Open class.   Most of them are smaller bores with basically the same bottom end configurations as our previously tested kits with a few exceptions on a couple models to handle the additional weight of the ATV chassis. Currently we have kits available for the following models. 2004-2009 Honda CRF250R – 295cc 2004-Current Honda CRF250X – 295cc 2010-Current Honda CRF250R – 297cc 2001-2013 Yamaha YZ250F – 299cc 2001-Current Yamaha WR250F – 299cc 2004-Current Suzuki RMZ250 – 299cc 2004-Current Kawasaki KX250F – 299cc      ...

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RM-Z 475 Stealth Big Bore

Please call to order 608-842-0680 Be the first to review this product Availability: In stock. Regular Price: $630.00 Special Price: $475.00   Quick Overview RM-Z 475 STEALTH Specifications: Fits 2006-2007 RM-Z 450   Choose option: We modify your cylinder Exchange Cylinder Installed and Blueprinted: $ 300.00   Product Description Bore: Yes Stroke: No Actual Displacement = 473.69cc Engine Modifications Included: Cylinder: OEM Cylinder bored and plated with Ceramic Nickel Bore coating Fuel Required: 91 – 110 octane – Options Available Piston: Wiseco Piston Head: No modification required Crankcase: No modification required...

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DRZ, LTZ, KFX, DVX 522 ICE CUBE Big Bore/Stroker

Please call to order 608-842-0680 Availability: In stock. Regular Price: $2,350.00 Special Price: $1,999.00   Quick Overview Max Power’s Ice Cube big bore/stroker kit for Suzuki LTZ400, DRZ400, Kawasaki KFX400 and Arctic Cat DVX400. Max Power’s Ice Cube big bore/stroker for Suzuki LTZ400, DRZ400, Kawasaki KFX400 and Arctic Cat DVX400.     Product Description Engine Modifications Included: Cylinder: Billet Aluminum Cylinder and long skirt forged aluminum sleeve plated with ceramic bore coating. Copper fire ring installed around combustion chamber. Necessary Gaskets Your crankshaft stroked and balanced with a Carrillo Rod and larger bottom bearing. This is a full on race kit, it is built to order. Installation requires case machining and grinding the balance shaft to clear the rod.  ...

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DRZ, LTZ, KFX, DVX 485 ICE CUBE Big Bore/Stroker

Please call to order 608-842-0680 Availability: In stock. Regular Price: $1,649.00 Special Price: $1,295.00   Quick Overview Max Power’s Ice Cube big bore/stroker kit for Suzuki LTZ400, DRZ400, Kawasaki KFX400 and Arctic Cat DVX400.   Product Description Max Power’s Ice Cube big bore/stroker for Suzuki LTZ400, DRZ400, Kawasaki KFX400 and Arctic Cat DVX400. Engine Modifications Included: Cylinder: Billet Aluminum Cylinder and long skirt forged aluminum sleeve plated with ceramic bore coating. Copper fire ring installed around combustion chamber. Necessary Gaskets Aftermarket +4mm stroke crankshaft Colors available depend on inventory Cylinder can later be stroked to...

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DRZ, LTZ, KFX, DVX 455 ICE CUBE Big Bore

Please call to order 608-842-0680 Availability: In stock. Regular Price: $1,249.00 Special Price: $795.00   Quick Overview Max Power’s Ice Cube big bore cylinder for Suzuki LTZ400, DRZ400, Kawasaki KFX400 and Arctic Cat DVX400.   Choose option: Installed and Blueprinted: $ 300.00   Product Description Max Power’s Ice Cube big bore cylinder for Suzuki LTZ400, DRZ400, Kawasaki KFX400 and Arctic Cat DVX400.   Engine Modifications Included: Cylinder: Billet Aluminum Cylinder and long skirt forged aluminum sleeve plated with ceramic bore coating. Copper fire ring installed around combustion chamber. Necessary Gaskets Colors available depend on inventory Cylinder can later be stroked to 485cc or 522cc....

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Cylinder Exchange Kit KFX,DRZ,LTZ,DVX 400 00-Current

Please call to order 608-842-0680 Availability: In stock. Regular Price: $644.00 Special Price: $399.00   Quick Overview Cylinder Exchange Kit 2000 – Current KFX400, LTZ400, DRZ400, DVX400 Stock Bore (90mm)   Product Description Cylinder Exchange Kit 2000 – Current KFX400, LTZ400, DRZ400, DVX400 Stock Bore (90mm)   Includes: OEM Cylinder – Nickle Ceramic coated Wiseco Piston Kit 13.5:1 (CP Piston 12.5:1 also available) Top End Gasket Set Cylinder Core Charge added to purchase and then refunded when you send back your good OEM core cylinder. Product usually in stock but availability varies. We will contact you the next business day if kit is not immediately available. Please call if you want a different compression or a CP Piston kit. CP Piston $30 additional.   Top End Exchange Program FAQ’s   Q: What is it? A: Max Power-RPM’s top end exchange program is simply the fastest and easiest way to replace your thumper’s worn out top end with the highest quality replacement parts available.   Q: How does it work? A: Pretty simple really. You can order the kit on-line or call us. We send you the parts ASAP. You can either send us your core cylinder right away or wait until you receive the new stuff from us. Just be sure to include your contact info with the core so we can make sure you get your money!   Q: Is there a cylinder core charge? A: Yes, The cylinder core charge is included in the price of the kit. When we receive your good core cylinder we will refund the core charge to you. The core charges vary by model and are listed on the page.   Q: What is the quality of the parts I am purchasing? A: Max Power-RPM’s only offers Ceramic Nickel Bore plated OEM cylinders. The bore coating is the highest quality in the world. It depends on the model but we usually offer pistons from either CP Pistons or Wiseco. Gaskets are from the OEM, Wiseco, or Cometic.   Q: What if you are out of stock on my model cylinder? A: If for some reason we are out of stock on your model we will re-plate your cylinder on our RUSH SERVICE at no additional charge. Of course there also will be no core charge assessed.   Q: What models are included in this program? A: Honda: CRF250 – CRF450 – TRX450 Kawasaki: KXF250 – KXF450 – KFX400 – KFX450 Suzuki: RMZ250 – RMZ450 – DRZ400 – LTZ400 – LTR450 Yamaha: YZ250F – YZ450F – WR250F – WR450F – YFZ450 – YFZ450R   Q: Are big bores included in this program? A: No these are for stock bore machines.   Q: What if I want to supply my own pistons and gaskets? A. We can work out the price difference for you. Give us a call.   Q: Do you buy core 4-stroke cylinders? A: Yes if we are running low on inventory. Call us with what you...

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DR-Z 522 Big Bore/Stroker – STEALTH

Please call to order 608-842-0680 Availability: In stock. $2,060.00   Quick Overview DRZ522 STEALTH Specifications: Fits 2003-2008 Suzuki LT-Z400, DR-Z400, Kawasaki KFX400 and Artic Cat DVX400   Choose option: Installed and Blueprinted: $ 500.00   Product Description Bore: Yes Stroke: Yes Actual Displacement = 521.15cc Engine Modifications Included: Cylinder: OEM Cylinder and long skirt forged aluminum sleeve plated with ceramic bore coating. Copper fire ring installed around combustion chamber. Necessary Gaskets Your crankshaft stroked and balanced with a Carrillo Rod and larger bottom bearing. This is the price to modify your crank shaft.  If you want new crankshaft 1/2’s we can provide them. Call us for current prices Fuel Required: 110 Octane – This is a full-blown race engine see 490cc kit for pump fuel. Piston: Custom CP Piston Crankcase: Balance shaft requires modification to clear rod. Requires cases to be bored for large OD sleeve....

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DR-Z 470 Big Bore/Stroker STEALTH

Please call to order 608-842-0680 Availability: In stock. $1,075.00   Quick Overview DRZ470 STEALTH Specifications: Fits 2003-2008 Suzuki LT-Z400, DR-Z400, Kawasaki KFX400 and Artic Cat DVX400   Choose option: “Bolt on” – Includes cylinder Installed and Blueprinted: $ 500.00   Product Description 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 Notes: We do not accept cores for this...

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DRZ,LTZ,KFX,DVX 455 Stealth Big Bore

Please call to order 608-842-0680 Availability: In stock. Regular Price: $995.00 Special Price: $795.00 Quick Overview DRZ,LTZ,KFX,DVX 455 Stealth Big Bore Fits 2000 – Current Suzuki LT-Z400, DR-Z400, Kawasaki KFX400 and Arctic Cat DVX400   Product Description Bore: Yes Stroke: No Actual Displacement = 453.11cc Includes: Cylinder: Modified OEM with Nickle Ceramic bore coating Copper fire ring installed around combustion chamber Compression: 12.5:1 – 13.5:1 Piston: CP Piston Kit Necessary Gaskets Head: No modification required Crankcase: No modification required Price requires you to send us your OEM cylinder for modification. You can purchase an OEM core cylinder from us when...

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DR-Z 440 Stealth Big Bore

Please call to order 608-842-0680 Availability: In stock. Regular Price: $595.00 Special Price: $475.00   Quick Overview DRZ440 STEALTH Specifications:Fits 2003-2008 Suzuki LT-Z400, DR-Z400, Kawasaki KFX400 and Artic Cat DVX400   Choose option: We modify your cylinder Exchange cylinder “Bolt on” – Includes cylinder: call for price Installed and Blueprinted: $ 300.00   Product Description Bore: Yes Stroke: No Actual Displacement = 439.06cc Engine Modifications Included: Cylinder: OEM Bored and plated with Nickle Ceramic coating Compression: Options available customized to your preference. Piston: Wiseco Head: No modification required Crankcase: No modification required  ...

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DR-Z 435 Stealth Big Bore

  Please call to order 608-842-0680 Availability: In stock. Regular Price: $599.95 Special Price: $475.00   Quick Overview DRZ435 STEALTH Specifications: Fits 2003-2008 Suzuki LT-Z400, DR-Z400, Kawasaki KFX400 and Artic Cat DVX400   Choose option: “Bolt On” – Includes cylinder   Product Description Bore: Yes Stroke: No Actual Displacement = 434.43cc Includes: Cast Cylinder – Nickel Plated 91 Octane Vertex Piston Necessary Gasket Head: No modification required Crankcase: No modification required Dealer discounts do not apply to this kit....

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DRZ,LTZ,KFX,DVX 485 Stealth Big Bore / Stroker

Please call to order 608-842-0680 Availability: In stock. $1,299.00   Quick Overview DRZ,LTZ,KFX,DVX 485 Stealth Big Bore / Stroker Fits 2000-Current Suzuki LT-Z400, DR-Z400, Kawasaki KFX400 and Arctic Cat DVX400   Product Description Bore: Yes Stroke: Yes Actual Displacement = 485cc Engine Modifications Included: Cylinder: OEM Cylinder and long skirt forged aluminum sleeve plated with ceramic bore coating. Copper fire ring installed around combustion chamber. Necessary Gaskets Piston: Custom CP Piston Compression Range: 12.5:1 – 14.5:1 Crankshaft: Aftermarket stroker crank Crankcase: No modification required Price requires you to send us your OEM cylinder for modification. You can purchase an OEM core cylinder from depending on availability. Additional Information Additional Options Installed and Blue...

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RMZ 276 Stealth Big Bore

Please call to order 608-842-0680 Availability: In stock. Regular Price: $925.00 Special Price: $795.00   Quick Overview RM-Z 276 STEALTH Specifications: Fits 2004 – Current RMZ 250   Choose option: We modify your cylinder Exchange cylinder: $ 75.00 “Bolt on” – Includes Cylinder: $ 274.00 Installed and Blueprinted: $ 300.00   Product Description Bore: Yes Stroke: No Actual Displacement = 276.20cc Engine Modifications Included: Cylinder: OEM cylinder with “Ice Cube Style” Sleeve installed, and plated with Ceramic Nickel Bore Fuel Required: 91-100 octane – Options Available Piston: Wiseco or CP Piston Gaskets: Top end gaskets included. Crankcase/Head: No modification...

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RMZ 300cc Stealth Big Bore / Long Rod Stroker

Please call to order 608-842-0680 Availability: In stock. Regular Price: $2,270.00 Special Price: $1,695.00   Quick Overview For: 2004-Current RMZ250   Product Description For: 2004-Current RMZ250 Includes: Cylinder: Install forged Aluminum sleeve, and plate with Ceramic Nickel Bore coating. Crankshaft: Stroke and balance with long rod installed. CP Piston kit Necessary Gaskets Base Spacer Plate Longer Cam Chain Longer Chain Guides Longer head bolts No Case Mods Required This price is to modify your cylinder and crankshaft. Call us for a bolt in price. Upper head mounts must be modified to clear taller cylinder, we do not provide instructions to do this. This kit uses a huge stroke and slightly bigger bore. The torque gains are massive but the engine still revs quickly and pulls out on top like a smaller 250F. Durability is very, very good. It is a great choice for hybrid youth ATV’s and vets that like a small 250f but hate getting yarded by 450’s on the hole...

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RMZ 315 Ice Cube Big Bore/Stroker

Please call to order 608-842-0680 Availability: In stock. Regular Price: $2,750.00 Special Price: $1,695.00   Quick Overview RMZ 315 STEALTH Specifications: Fits 2004 – 2008 RMZ 250   Choose option: “Bolt on” – Includes cylinder and crankshaft Installed and Blueprinted: $ 500.00     Product Description Bore: Yes Stroke: Yes Actual Displacement = 315cc Engine Modifications Included: Cylinder: Tall Ice Cube cylinder plated with Ceramic Nickel Bore Fuel Required: 91-100 octane Piston: CP Piston Crankshaft: Stroked and balanced with Long rod kit. Crankcase/Head: minor case modification required (dremel) Includes: Tall Ice Cube Cylinder CP Piston Kit Stroked and balanced long rod stroker crankshaft Necessary gaskets Notes: Requires modifications to upper head stays for 2007-2008 RMZ250. Short stays available for 2004-2006 RMZ for $25 additional. Notes: Price requires you to send us your core...

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RM-Z 277 Stealth Big Bore/Stroker

Please call to order 608-842-0680 Availability: In stock. $1,999.00   Quick Overview RM-Z 277 STEALTH Specifications: Fits 2004 – 2006 RM-Z 250   Choose option: Exchange cylinder and crankshaft “Bolt on” – Includes cylinder and crankshaft: $ 151.00 Installed and Blueprinted: $300.00   Product Description Bore: Yes Stroke: Yes Actual Displacement = 277.44cc Engine Modifications Included: Cylinder: OEM cylinder bored and plated with Ceramic Nickel Bore Fuel Required: 100 octane (14:1) Piston: CP Piston Crankshaft: Stroked, balanced, and lightened. Crankcase/Head: No modification required Notes: This engine is very fast, loads of fun, and works excellent for MX. It looks totally stock and really comes on with porting, cams, and a Jardine RT-5 exhaust system. It revs super fast and almost hits like a 250 2-stroke, but with more bottom. It is good choice for vet riders that long for the old 2-stroke hit. Click here to see the dyno chart. Notes: All cores are subject to inspection before credit will be given....

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RM-Z 276 Ice Cube Big Bore

Please call to order 608-842-0680 Availability: In stock. Regular Price: $999.00 Special Price: $749.00   Quick Overview RM-Z 276 ICE CUBE Specifications: Fits 2004 – 2008 RM-Z 250   Choose option: “Bolt on” – Includes cylinder Installed and Blueprinted: $ 300.00   Product Description Bore: Yes Stroke: No Actual Displacement = 276.20cc Includes: Standard height Ice Cube cylinder CP Piston kit Necessary gaskets...

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