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GAEAF10
ATV City  |  SKU: 188.204
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Cylinder Kit 83.5mm Bore For Yamaha YFM350 Big Bear Bruin Grizzly Engine Rebuild

Regular price £160.00
Shipping calculated at checkout.

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Diolch i'n Cwsmeriaid Gwerthfawr.

Restore your Yamaha YFM350 engine's performance with the aftermarket Cylinder Kit for Big Bear, Bruin, and Grizzly — 83.5mm bore . This replacement kit is engineered for reliable rebuilds and performance restoration, delivering consistent compression and smooth operation under demanding riding conditions. The 83.5mm bore provides precise ring seal and compatibility with the listed models.

Comprehensive Vehicle Fitment

Based on verified aftermarket catalog data from multiple suppliers, this cylinder kit fits the following Yamaha models 

Manufacturer Models / Series Years / Details Source
Yamaha YFM350 Big Bear (YFM350FW/U) 1987–1999
Yamaha YFM350 Bruin (YFM350A/FA) 2004–2006
Yamaha YFM350 Grizzly (YFM350FG/G) 2007–2014
Yamaha YFM350 Moto-4 (YFM350ER) 1987–1995
Yamaha YFM350 Warrior 1987–2004
Yamaha YFM350 Wolverine 1995–2009
Yamaha YFM350 Raptor 2004–2011
Yamaha YFM350 Big Wheel 350 1987–1988

 

Detailed Fitment Notes:

  • Big Bear 350: Comprehensive fitment for Big Bear 350 YFM350FW (4x4) models from 1987-1999, as well as YFM350U (2x4) models from 1996-1999 

  • Grizzly 350: Compatible with Grizzly 350 models including 2x4 (YFM350G) and 4x4 (YFM350FG) variants from 2007 through 2014 

  • Raptor 350: Covers Raptor 350 (YFM350R) models from 2004-2013 

  • Wolverine 350: Fits Wolverine 350 4x4 (YFM350FX) from 1995-2005 and 2x4 (YFM350X) from 2006-2009 

  • Always verify the OEM reference for your exact model and year before installation

OEM Cross-Reference Information

This aftermarket cylinder kit is designed as a direct replacement for the following Yamaha OEM part numbers 

OEM Part Number Component
1UY-11310-03-00 Cylinder Assembly
5YT-11310-00-00 Cylinder (Superseded)
4WU-11310-00-00 Cylinder (Superseded)
1YW-11631-01-Y0 Piston
1UY-11631-01-Y0 Piston
5UH-11631-00-C0 Piston
4GB-11610-00-00 Piston Ring Set
1YW-11636-01 Piston (Oversize)
55V-11633-00-00 Wrist Pin
93450-19095-00 Circlip
1UY-11181-01-00 Cylinder Head Gasket
4KB-11351-00-00 Cylinder Base Gasket

Product Specifications

Specification Details
OEM Reference Part Number 1UY-11310-03-00 
Type Cylinder Kit (Top End Rebuild Kit) 
Bore Diameter 83.5mm (Oversize +0.50mm) 
Stroke 64.50mm 
Displacement 348cc 
Cylinder Material High-Grade Cast Aluminum 
Cylinder Sleeve Coating None 
Compression Ratio 10.25:1 (varies by manufacturer) 
Application Yamaha YFM350 Big Bear (1987-1999), YFM350 Bruin (2004-2006), YFM350 Grizzly (2007-2014) and related models
Condition New aftermarket

OEM part numbers are provided for cross-reference purposes only. Always verify fitment using your vehicle's specific model, year, and serial number before ordering.

Restore your Yamaha YFM350 engine's compression with this premium aftermarket cylinder kit—order today!

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