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Wiseco Piston 0.50mm Over 85.50mm #394M08550 Yamaha YZ400/IT400 1977-1978

Product Details

  • Dedicated forging
  • Superior strength/weight ratio utilizing Aerospace alloy
  • Race proven designs
  • Chosen by top race teams, in all forms of racing
  • CNC machined
  • Optimal cam shape and profile for peak HP and service life
  • Precision machined, highest quality materials for strength and reduced friction
  • High-performance ring set
  • Extended life and sustained power
  • Highest quality, alloy pin
  • Consistently true and durable
  • All Wiseco piston kits include 1 piston, 1 ring set, 1 wristpin and 2 circlips. Unless otherwise noted, top-end bearings, gaskets, and sleeves are not included.
  • Note: All kits cover a single cylinder only
  • Wiseco piston kits are sold by application and bore size. To ensure you receive the correct piston kit for your application, you must know the standard bore size to make sure you are ordering either the standard or correct amount of oversize that you need. If you have any questions, please email us.
Wiseco Part#: 394M08550
Product Type: Single Pistons

Specifications:

Bore - Standard: 85.00mm
Stroke: 70.00mm
Displacement: 400cc
Bore - Actual: 85.50mm
Bore - Oversize: 0.50mm

Item Contents:

3366TD - 85.50 MM RING SET
CW18 - ROUND WIRE PIN LOCKS 18MM (PAIR)
S277 - PIN-18MM X 2.5787"-UNCHROMED 2&4 CY

Fit Guide

Model
Piston
Country of Origin
USA
Number of Pistons Included
1 Piston(s)
Size Over Standard
0.50mm Over Stock

Product Fitment

This item fits the following applications:

Yamaha IT400 1977-1978
Yamaha YZ400 1977-1978