Engine Rebuild Kits

Engine Rebuild Kits: matched parts to put a tired motor back together right

Engine rebuild kits bundle the wear parts you replace when a motor comes apart - pistons, rings, gaskets, seals and bearings, matched to bore and spec so you are not sourcing a dozen part numbers one at a time. If you are freshening a dirt bike top end, replacing a scored bottom end, or building a boosted road engine after a failure, a kit gets the components that must work together into one box. It is the difference between a clean assembly and chasing a mismatched gasket set halfway through the job.

What ThreePiece stocks

There are 11 engine rebuild kits in this category, spanning 4 brands: Cometic Gasket (5 of the sample), HKS (3), Vertex Pistons (2) and Hot Rods (1). Current pricing runs from $86 to $755 for what is in stock right now - not a promise, just the live spread. That covers powersports and automotive: fitment data names Yamaha, Suzuki, Kawasaki, Harley-Davidson and Toyota, across vehicles like the Yamaha YZ 85, YZ 125 and YZ 125 X, Suzuki GSX1300R, Kawasaki ZX-10R, Harley-Davidson Sportster and the Toyota 2JZ-GE, with model years from 1993 to 2023.

How to choose

The first decision is how deep the job goes. A top end kit like the Cometic Street Pro Toyota 4AGE Top End Kit covers head gaskets and upper wear parts when the bottom end is sound. A bottom end kit such as the Hot Rods YZ 85 Bottom End Kit handles crank and lower assembly. A complete kit - the Vertex Yamaha Complete Engine Rebuild Kit or the Vertex YZ 125 Complete Engine Rebuild Kit - is the full teardown package.

The second is application. Powersports kits from Vertex and Hot Rods are single-model specific. HKS kits like the HKS RS S14/15 SR20DET and the HKS SPF FD3S 13B-REW target performance road engines. Match the kit to your exact platform first, then decide how much of the motor you are opening.

What else you need with it

Most rebuilds need parts beyond the kit. Pull fresh bearings and check the pistons range if yours are out of spec. Standalone head gaskets and full gasket kits fill gaps a top end kit leaves. Fresh oil filters go on at first fire-up. Browse the full Engine Components section for the rest of the build.

Fitment and ordering

Only 6 of these kits carry detailed fitment data, so confirm your make, model and year before you order. Call fitment help at 813-535-5801 or reach us through contact us if you are unsure. All orders ship free, and Affirm and Katapult financing is available through our financing page for larger builds.

Engine Rebuild Kits: matched parts to put a tired motor back together right

Engine rebuild kits bundle the wear parts you replace when a motor comes apart - pistons, rings, gaskets, seals and bearings, matched to bore and spec so you are not sourcing a dozen part numbers one at a time. If you are freshening a dirt bike top end, replacing a scored bottom end, or building a boosted road engine after a failure, a kit gets the components that must work together into one box. It is the difference between a clean assembly and chasing a mismatched gasket set halfway through the job.

What ThreePiece stocks

There are 11 engine rebuild kits in this category, spanning 4 brands: Cometic Gasket (5 of the sample), HKS (3), Vertex Pistons (2) and Hot Rods (1). Current pricing runs from $86 to $755 for what is in stock right now - not a promise, just the live spread. That covers powersports and automotive: fitment data names Yamaha, Suzuki, Kawasaki, Harley-Davidson and Toyota, across vehicles like the Yamaha YZ 85, YZ 125 and YZ 125 X, Suzuki GSX1300R, Kawasaki ZX-10R, Harley-Davidson Sportster and the Toyota 2JZ-GE, with model years from 1993 to 2023.

How to choose

The first decision is how deep the job goes. A top end kit like the Cometic Street Pro Toyota 4AGE Top End Kit covers head gaskets and upper wear parts when the bottom end is sound. A bottom end kit such as the Hot Rods YZ 85 Bottom End Kit handles crank and lower assembly. A complete kit - the Vertex Yamaha Complete Engine Rebuild Kit or the Vertex YZ 125 Complete Engine Rebuild Kit - is the full teardown package.

The second is application. Powersports kits from Vertex and Hot Rods are single-model specific. HKS kits like the HKS RS S14/15 SR20DET and the HKS SPF FD3S 13B-REW target performance road engines. Match the kit to your exact platform first, then decide how much of the motor you are opening.

What else you need with it

Most rebuilds need parts beyond the kit. Pull fresh bearings and check the pistons range if yours are out of spec. Standalone head gaskets and full gasket kits fill gaps a top end kit leaves. Fresh oil filters go on at first fire-up. Browse the full Engine Components section for the rest of the build.

Fitment and ordering

Only 6 of these kits carry detailed fitment data, so confirm your make, model and year before you order. Call fitment help at 813-535-5801 or reach us through contact us if you are unsure. All orders ship free, and Affirm and Katapult financing is available through our financing page for larger builds.