YFZ 458/468 Stealth Big Bore (97mm)

YFZ 468/478 Stealth Big Bore (98mm)

YFZ 478/488 Stealth Big Bore (99mm)

YFZ 478/488 ICE CUBE Big Bore (99mm)

YFZ 491 Stealth Big Bore / Stroker

YFZ 502 Stealth Big Bore / Stroker

YFZ505R Stealth Big Bore / Stroker(NEW)

YFZ 511 Stealth Big Bore / Stroker

YFZ 511 ICE CUBE Big Bore / Stroker

YFZ 523 Stealth Big Bore / Stroker

YFZ 523 ICE CUBE Big Bore / Stroker

Click here for more performance options for your YFZ 450

YFZ 458/468 Stealth Big Bore

 YFZ 458/468 STEALTH Specifications:

Fits 2004-2008 YFZ 450 and 2009 YFZ450R

Bore: Yes

Stroke: No

Actual Displacement = 458.16(04-05) / 468.52cc(06-09)

Notes:  This is a 97mm bored and Apticote 2000 plated OEM Yamaha cylinder.  By keeping the bore just 2mm over stock this kit remains totally reliable and still provides a good performance improvement.  It is an excellent value for the money.  It is a good choice where you need to rebuild the engine and want to bump the power but only have limited funds.   

Max Power's Apticote 2000 ceramic bore coating is the best available and Max Power's plating craftsmanship far surpasses the quality of anything else out there.  (Just ask builders like Pro Circuit, Duncan Racing, ATP, Rossier Engineering, CT Racing or any of the factory teams- We plate cylinders for all of them.) 

We offer this as a kit with either a Wiseco or CP piston in various compression ratios.  If you are looking to use your own piston we also can bore and replate your cylinder with Apticote 2000 for $300.  This is the largest bore on an OEM cylinder that you should use a stroker crankshaft with.         

This Kit Includes

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YFZ 468/478 Stealth Big Bore

$549	We Modify your cylinder
$75	Exchange - Additional Charge
$549	Aftermarket "Bolt On" - Includes Cylinder
$849	Installed and blueprinted

 YFZ 468/478 STEALTH Specifications:

Fits 2004-2008 YFZ450 and 2009 YFZ450R

Bore: Yes

Stroke: No

Actual Displacement = 467.66(04-05) / 478.23cc(06-09)

Engine Modifications Included:
Cylinder:	Max Power Modified or 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

Notes:  This is a 98mm bored and Apticote 2000 plated OEM Yamaha cylinder.  At 3mm over it is starting to push the stock casting to the edge, however it remains quite reliable and we only really see issues when customers try to run stroker crankshafts with them.  In other words, with a stock stroke they work well, add stroke and you will have problems.  It is a good choice where you need to rebuild the engine, want to bump the power, have limited funds, and do not want to add stroke later down the road.   

Max Power's Apticote 2000 ceramic bore coating is the best available and Max Power's plating craftsmanship far surpasses the quality of anything else out there.  (Just ask builders like Pro Circuit, Duncan Racing, ATP, Rossier Engineering, CT Racing or any of the factory teams- We plate cylinders for all of them.)

We offer this as a kit with either a Wiseco or CP piston in various compression ratios.  If you are looking to use your own piston we also can bore and replate your cylinder with Apticote 2000 for $300.  This is the largest bore on an OEM cylinder (without a thicker sleeve) that you should use.

The aftermarket cast cylinder option is not the same quality as a Apticote 2000 plated, Max Power modified cylinder.  It is however an option if you do not want to wait for a kit, but please call to check availability if you are in a hurry.   

This Kit Includes

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YFZ 478/488 Stealth Big Bore

YFZ 478/488 STEALTH Specifications:

Fits 2004-2008 YFZ450 and 2009 YFZ450R

Notes:  This is a 99mm OEM cylinder that has a forged aluminum sleeve installed it is coated with Apticote 2000.  At 4mm over OEM bored cylinders have about a 20% failure rate.  That is why we take the OEM cylinder and install a forged aluminum sleeve in it.  The sleeve is the same material as what the pistons are made from so expansion rates are similar and the durability is exceptionally high.   The water jackets are slightly smaller than stock but not significant enough to change the operating tempature of our test engines.   

This kit is a good choice when you want to bump the performance of the engine but need to stay looking stock.  There are no identifing marks what so ever on the outside of this cylinder that will identify it as what it truly is.  It is compatable with most stroker cranks that require a stock height cylinder.  Call if you have questions.

Max Power's Apticote 2000 ceramic bore coating is the best available and Max Power's plating craftsmanship far surpasses the quality of anything else out there.  (Just ask builders like Pro Circuit, Duncan Racing, ATP, Rossier Engineering, CT Racing or any of the factory teams- We plate cylinders for all of them.) 

We offer this as a kit with a CP piston kit in various compression ratios.  If you are looking to use your own piston we also can make this cylinder in other bore sizes for the same amount.  Just call or e-mail us with your requirements.  

This Kit Includes

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YFZ 478/488 Ice Cube Big Bore

YFZ 478/488 Ice Cube Specifications:

Fits 2004-2008 YFZ 450

Notes:  This is a 99mm Billet Aluminum cylinder that has a forged aluminum sleeve installed it is coated with Apticote 2000.  At 4mm over OEM bored cylinders have about a 20% failure rate.  That is why we designed the Ice Cube cylinder. 

The Ice Cube Cylinder is the only aftermarket cylinder available that was designed for big bore applications right from the start. 

Most of the cast big bore cylinders that are out there were originally designed as stock replacement cylinders.  Once the big bore movement really took off around 2005 companies decided to machine and plate them oversize to sell to the budget big bore market.  Most of these cylinders have less than 1/2 of the coolant capacity of the Ice Cube. (We know because we checked them). 

Water jacket capacity is not where the Ice Cube advantages stop.   The Ice Cube is made from 2 extremely dense forms of aeorspace grade aluminum, billet and forged.  Dense forged aluminum (the same grade as piston forgings) provides the higest level of strength and transfers heat faster than steel or even cast aluminum.   These strength and heat transfer properties makes it ideal for this application where space is limited and stress is increased.  The Ice Cube is also the only cylinder that has extended cylinder skirts that provide piston support at BDC for stroker cranks.  This advantage alone increases piston life dramatically in stroker applications.

This kit is a good choice for the customer who is looking for the kit with the best value out there. The addition of this kit not only will raise the value of your machine but it will set you apart from the crowd as an owner that is not willing to compromise on performance.   The Ice Cube Cylinder means quality and value backed by Max Power support.  The Ice Cube cylinder is compatable with most stroker cranks that require a stock height cylinder.  Call if you have application questions.

The Ice Cube is coated with Max Power's Apticote 2000 ceramic bore coating.  It is the best plating available and Max Power's plating craftsmanship far surpasses the quality of anything else out there.  (Just ask builders like Pro Circuit, Duncan Racing, ATP, Rossier Engineering, CT Racing or any of the factory teams- We plate cylinders for all of them.) 

We offer this as a kit with a CP piston kit in various compression ratios.  If you are looking to use your own piston we also can make you this cylinder in custom bore sizes for $995.  Just call or e-mail us with your requirements.  

This Kit Includes

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YFZ 491 Stealth Big Bore/Stroker

YFZ 491 STEALTH Specifications:

Fits 2004-2008 YFZ 450

Notes:  This kit is a real diamond in the rough.  The first time we hit the track with this kit it really got our attention.  It revs out super fast and pulls like a much bigger engine than what it is.  It uses a +3mm Hot Rods crankshaft and a Max Power Apticote 2000 plated OEM 97mm cylinder.  We highly reccomend getting the cranked balanced or your hands will fall asleep.  We also provide a full botom end gasket and seal kit.  It is basically a total rebuild kit less main bearings (and we can get you those also for a bit more)  It comes in multiple compression ratios and uses either a CP or Wiesco piston - Your choice.  If you got a tired YFZ, limited funds, and some mechnical skill, this kit is a pretty sweet deal that really does the trick.    

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YFZ 502 Stealth Big Bore/Stroker

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YFZ505R Stealth Big Bore/Stroker

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YFZ 511 Stealth Big Bore/Stroker

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YFZ 511 Ice Cube Big Bore/Stroker

YFZ 511 Ice Cube Specifications:

Fits 2004-2008 YFZ 450

Notes:  This is a 99mm Billet Aluminum cylinder that has a forged aluminum sleeve installed it is coated with Apticote 2000.  It also comes with an aftermarket stroker crankshaft.  At 4mm over OEM bored cylinders have about a 20% failure rate, they last about 10 seconds with a stroker crank.  That is why we designed the Ice Cube cylinder. 

The Ice Cube Cylinder is the only aftermarket cylinder available that was designed for big bore applications right from the start. 

Most of the cast big bore cylinders that are out there were originally designed as stock replacement cylinders.  Once the big bore movement really took off around 2005 companies decided to machine and plate them oversize to sell to the budget big bore market.  Most of these cylinders have less than 1/2 of the coolant capacity of the Ice Cube. (We know because we checked them).  They also have skirts that fold like a house of cards when you put stroke to them.

Water jacket capacity is not where the Ice Cube advantages stop.   The Ice Cube is made from 2 extremely dense forms of aeorspace grade aluminum, billet and forged.  Dense forged aluminum (the same grade as piston forgings) provides the higest level of strength and transfers heat faster than steel or even cast aluminum.   These strength and heat transfer properties makes it ideal for this application where space is limited and stress is increased.  The Ice Cube is also the only cylinder that has extended cylinder skirts that provide piston support at BDC (bottom dead center) for stroker cranks.  Every other cylinder out there allows the piston to drop out of the bore at BDC.  This advantage of the Ice Cube increases piston life dramatically in stroker applications.

This kit is a good choice for the customer who is looking for a Big bore kit and also needs to replace the crankshaft.  It does not build as much torque as the 523 kit but it certainally will hold it's own against most anything out there.   We do not recommend you install this kit with out balancing the crank.  We have sold a few of them this way and every time the customer sends them back to get balanced.  Just figure on getting it balanced up front and save yourself a load of trouble.

The addition of this kit not only will raise the value of your machine but it will set you apart from the crowd as an owner that is not willing to compromise on performance.  The Ice Cube Cylinder means quality and value backed by Max Power support.  

The Ice Cube is coated with Max Power's Apticote 2000 ceramic bore coating.  It is the best plating available and Max Power's plating craftsmanship far surpasses the quality of anything else out there.  (Just ask builders like Pro Circuit, Duncan Racing, ATP, Rossier Engineering, CT Racing or any of the factory teams- We plate cylinders for all of them.) 

We offer this as a kit with a CP piston kit in various compression ratios.    

This Kit Includes

Click Here to order this kit now!

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YFZ 523 Stealth Big Bore/Stroker

Click here to read the ATV Action Dune Monster YFZ523 article

YFZ 523 STEALTH Specifications:

Fits 2004-2008 YFZ 450 

Same cylinder as the YFZ478 / 488 Stealth with the 523 Ice Cube crank.  If you want nobody to know what you got and really want to smoke them then give it a try.  We also recommend additional cooling upgrades for extreme applications.  IE: Low speed, hot weather. 

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YFZ 523 Ice Cube Big Bore/Stroker

Click here to read the ATV Action Dune Monster YFZ523 article

YFZ 523 Ice Cube Specifications:

Fits 2004-2008 YFZ 450

Notes:  This is a 99mm Billet Aluminum cylinder that has a forged aluminum sleeve installed it is coated with Apticote 2000.  It also comes with an OEM Max Power stroked and balanced crankshaft with a Knife rod installed.  At 4mm over OEM bored cylinders have about a 20% failure rate, they last about 10 seconds with a stroker crank.  That is why we designed the Ice Cube cylinder. 

The Ice Cube Cylinder is the only aftermarket cylinder available that was designed for big bore applications right from the start. 

Most of the cast big bore cylinders that are out there were originally designed as stock replacement cylinders.  Once the big bore movement really took off around 2005 companies decided to machine and plate them oversize to sell to the budget big bore market.  Most of these cylinders have less than 1/2 of the coolant capacity of the Ice Cube. (We know because we checked them).  They also have skirts that fold like a house of cards when you put stroke to them.

Water jacket capacity is not where the Ice Cube advantages stop.   The Ice Cube is made from 2 extremely dense forms of aeorspace grade aluminum, billet and forged.  Dense forged aluminum (the same grade as piston forgings) provides the higest level of strength and transfers heat faster than steel or even cast aluminum.   These strength and heat transfer properties makes it ideal for this application where space is limited and stress is increased.  The Ice Cube is also the only cylinder that has extended cylinder skirts that provide piston support at BDC (bottom dead center) for stroker cranks.  Every other cylinder out there allows the piston to drop out of the bore at BDC.  This advantage of the Ice Cube increases piston life dramatically in stroker applications.

This kit is a good choice for the customer who is looking for a large displacement YFZ with the best value out there. The addition of this kit not only will raise the value of your machine but it will set you apart from the crowd as an owner that is not willing to compromise on performance.  The Ice Cube Cylinder means quality and value backed by Max Power support.  

The Ice Cube is coated with Max Power's Apticote 2000 ceramic bore coating.  It is the best plating available and Max Power's plating craftsmanship far surpasses the quality of anything else out there.  (Just ask builders like Pro Circuit, Duncan Racing, ATP, Rossier Engineering, CT Racing or any of the factory teams- We plate cylinders for all of them.) 

We offer this as a kit with a CP piston kit in various compression ratios.    

This Kit Includes

Click Here to order this kit now!

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