CR 139 Big Bore

Motorcycle Honda CR139

Please call to order 608-842-0680

Special Price: $549

Quick Overview Fits 1994-2003 and 2005-2007 Honda CR125R

Product Description

Actual Displacement = 138.83cc

Engine Modifications Included:

Cylinder: Bore, Port and Plate.

Power Valves: Machined to match big bore piston.

Head: Re-chamber to work with the Big Bore piston. 100 octane suggested for most conditions.

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 Max Power Honda CR139 kit is incredible.  The custom Wiseco piston we use on our CR139 is actually lighter than the stock piston and almost 20 grams lighter than the shelf stock Wiseco 139 piston most builders use.  That means all the power increases of a bigger bore without the slow rev and vibration.

On 1999-2007 engine we off-set bore the cylinder to the intake side to keep from weakening the exhaust port.   This extra step we do makes the CR139 very reliable.

This kit is not available for the 2004 Honda CR125.  Check out the CR134.



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