Wiseco Motorrekonstruktionskit Yamaha YFZ 350 Banshee 87-06

_Wiseco Motorrekonstruktionskit Yamaha YFZ 350 Banshee 87-06 | WPWR100 | Greenland MX_

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Wiseco Motorrekonstruktionskit Yamaha YFZ 350 Banshee 87-06

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Tech. Details

Wiseco Engine Rebuild Kit

The Wiseco Garage Buddy Kit is a comprehensive engine rebuild package that includes all the necessary components for both bottom and top-end rebuilds. This all-in-one kit features everything from the crank to the piston kit, and even an hour meter to track maintenance, all conveniently packaged in a single box.

Engine rebuilds are an essential aspect of proper maintenance, and for many, it is due to engine failure. Regardless of the cause, the first step is to disassemble and inspect the engine. Once the damage to the engine cases or cylinder has been assessed and repaired, the next step is to decide which internal engine components to purchase, where to buy them, and how much they will cost.

A complete engine rebuild is a significant undertaking and requires the replacement of many parts, particularly in four-stroke engines. Components such as bottom-end bearings and seals, a crankshaft assembly, pistons, rings, clips, wrist pin, and various gaskets are all essential for reassembly.

For years, Wiseco has been offering top-end kits that include pistons, rings, clips, gaskets, and seals, all under one part number. Similarly, complete bottom-end rebuild kits are also available from Wiseco, including all the necessary parts under a single part number. Combining these kits and including additional extras like an hour meter creates the Wiseco Garage Buddy Kit - the perfect buddy you want to have in your garage for a hassle-free, complete engine rebuild.

The kits include:

  • Crankshaft assembly
  • OEM quality main bearings
  • All engine gaskets, seals, and O-rings
  • Wiseco standard series forged piston kit (piston, ring(s), pin, clips)
  • Small end bearing (for two strokes)
  • Cam chain (for four strokes)
  • Hour meter with mounting bracket and hour meter decal
Marken Wiseco
Saison Ständige Kollektion


The pistons of any internal combustion engine, two or four-stroke, are conical and oval, to control its expansion in its operation. To get to know your maximum measurement you have to measure at 10-12 mm. of the skirt, in the opposite part to the bolt.

When we see a mark on the head of the piston, for example, 80 mm. or we have a cylinder of 80 mm. this measure is corresponds to the cylinder, when meassuing the piston we will see that actually measurement is 79.95 mm., the tolerance between piston and cylinder would be 5 cents (0.05 mm.).

In the aluminum cylinders with hard chrome interior treatment, already in disuse, or NIKASIL the measure of 80 mm. It is usually fixed to 80 mm.

The pistons work with tolerances between 4 to 6 hundredths (0.04-0.06) for two-stroke engines and 3 to 4 hundredths for four-stroke engines (0.03-0.04). To fix a deformed cylinder, the interior of the cylinder shall be polished first and the measurement is adjusted with pistons that are over-measured for this purpose, marked with letters A-B-C-D (selection); the lowest measure being A, increasing 1 hundredth per letter; that is, selection B 0.01 mm. greater than A, C 0.02 mm. greater than A, etc.


New Cylinder Ø 80.00 mm. mounts a piston of Ø 79,97 A Factory Tolerance 0.03 mm.

Polished Cylinder Ø 80,01 mm. mounts a piston Ø 79,98 B Factory Tolerance 0,03 mm.

Polished Cylinder Ø 80,02 mm. mounts a piston Ø 79,99 C Factory Tolerance 0,03 mm.

Polished Cylinder Ø 80,03 mm. mounts a piston Ø 80,00 D Factory Tolerance 0,03 mm.

The important thing is to maintain the tolerance, which the manufacturer recommends, between cylinder and piston.

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