YZ134 Big Bore

Motorcycle Kawasaki KX 139

Please call to order 608-842-0680

Special Price: $549


Quick Overview

YZ134 Specifications:
Fits 1997-Current YZ125

Product Description

Actual Displacement = 134.23cc

Engine Modifications Included:

Cylinder: Bore, Port and Plate.

Power Valves: Precision machined to match big bore ports.

Head: Re-chamber to work with the Big Bore piston set up to your octane requirements.

Crankshaft: No crank mods required.

Crankcase: No crankcase mods required.

Notes: This kit requires you to send us your cylinder, head, and power valves for modification.

The YZ134 is a great kit.  More everywhere over the stock engine with tons of over rev.

These used to be AMA legal in the 125 class so we have sold a pile of them over the years.

We use a custom ultra light weight Wiseco piston that is 3 grams lighter than stock.  If you have a YZ125, scream all the time, and are leery on the whole big bore thing the YZ134 is for you.

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