Wiseco Big Bore Kit Kawasaki KZ1000 1977-1980 1045cc K1045

If you're running a 1977-1980 Kawasaki KZ1000, you know the potential is there—but stock displacement limits what your engine can deliver. The Wiseco Big Bore Kit unlocks that potential by increasing displacement to 1045cc, giving you measurable gains in torque and horsepower without sacrificing reliability. This is a complete engine refresh that combines Wiseco's 60+ years of racing pedigree with precision-engineered components designed to handle the demands of both street and track.

What sets this kit apart is the attention to detail. Every component—from the forged pistons to the precision rings and head gasket—works together as a system. You're not bolting on aftermarket parts and hoping they play nice; you're installing a dyno-tested package engineered by American racers who understand what it takes to build a dependable big-bore engine. Installation is straightforward for anyone with engine rebuild experience, and the fit is tight enough that you won't waste power through gaps or tolerances.

• Displacement: 1045cc
• Vehicle: Kawasaki KZ1000
• Years: 1977–1980
• Material: Forged aerospace aluminum
• Includes: Pistons, rings, pins, retainer clips, head gasket
• Technology: Dyno-tested
• Installation: Engine rebuild required
• Origin: American-engineered