Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550
Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550

Wiseco 85.50 mm 3366TD Piston Kit, Part 394M08550

  • Sale
  • $199.99
  • $221.95
Shipping calculated at checkout.
We have 1 ready to ship.
Classic Forged 2-stroke pistons are perfect for those looking to rebuild their 2-stroke engine with reliable, high-quality components. These pistons cover a wide range of Powersports rebuilds, including vintage motocross models, classic street bikes, and snowmobiles. The forged material improves tensile strength over cast pistons, ensuring refreshed performance on the track or the trail. 85.50 mm Bore
  • Dedicated forgings and additional lightening operations allow for optimized strength-to-weight ratio
  • Improved tensile strength of forged material optimizes strength and service life
  • Includes high-quality piston ring(s), wrist pin(s), and circlips
  • Designed and built for each specific 2-stroke powersports engine
  • Engineered, forged, and machined in the USA in Mentor, OH

The Wiseco 3366TD Classic Forged 2-Stroke Piston Kit, manufacturer part number 394M08550 and vendor part number 394M08550, is designed for select Yamaha 2-stroke powersports engine rebuilds. With an 85.50 mm bore, this piston kit fits the 1977–1978 Yamaha IT400 and 1977–1978 Yamaha YZ400.

The forged piston material provides improved tensile strength compared with cast pistons, supporting strength and service life in refreshed 2-stroke engines. Dedicated forgings and additional lightening operations help optimize the strength-to-weight ratio. The kit includes piston ring(s), wrist pin(s), and circlips.

Wiseco designs and builds each piston for the specific 2-stroke powersports engine application. This piston is engineered, forged, and machined in the USA in Mentor, Ohio. Verify engine specifications and application details before installation.

Features:

  • Bore: 85.50 mm
  • Forged construction improves tensile strength compared with cast pistons
  • Dedicated forgings and lightening operations optimize the strength-to-weight ratio
  • Includes piston ring(s), wrist pin(s), and circlips
  • Designed for specific 2-stroke powersports engine applications
  • Fits 1977–1978 Yamaha IT400 and 1977–1978 Yamaha YZ400
  • Engineered, forged, and machined in the USA in Mentor, Ohio



Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: powersports
Epa: N/A
Regular Stock: false
Units Per Sku: 1
Fitment:
1977 Yamaha It400 Base
1977 Yamaha YZ400 Base
1978 Yamaha It400 Base
1978 Yamaha YZ400 Base