Kawasaki KX285 Big Bore

Motorcycles Kawasaki YZ285

Please call to order 608-842-0680

Special Price:

1994-2002 = $649

2003-2007 = $899


Max Power KX285 Fits 1994-Current KX250


Product Description

Bore: 71   Stroke: 72   Actual Displacement = 285.06cc

Engine Modifications Included:

Cylinder: Bore, Port and Plate.

Power Valves: Machined to match big bore cylinder.

Head: Re-chamber to work with the Big Bore piston.

Parts:  Custom Wiseco piston kit, top end bearing, necessary gaskets.

Notes: This kit requires you to send us your cylinder, head, and power valves for modification.


The Max Power KX285 is a rock-solid performer.  With nice smooth gains in the bottom and mid and a big top end pull you will not go wrong with this one.




One Comment

  1. Michael says:

    Thank you very much for the awesome job you have done on my kx 285 big bore kit, you have a very high level of standards, out standing job you have done!! Great communication right from the start and right till it was on its way back to me, it was also really good to get the information of the care you must give our motor to keep it in its best form its really ease just ignore what they say in the bike owners manual about caring for the motor, The power grains are incredible are from idle! 5th gear feels like I’m in 2nd gear now I can run with the 450 4 strokes now with ease, I just have to increase my fitness so I can keep up with the bike

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