CR 134 Big Bore

Motorcycle Honda CR139

Please call to order 608-842-0680

Special Price: $549


Quick Overview Fits 1994-2007 Honda CR125R


Product Description

Actual Displacement = 134.23cc

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 CR134 is a excellent package that increases the power across the board.  Our Custom piston is only 8 grams heavier than stock and 16 grams lighter than a typical 134 piston.    No vibration, good bottom and mid with a ton of over-rev.

If you have a 1999-2007 engine we off-set bore the piston to the intake side.  By doing this we keep the structural integrity of the exhaust port in tact making it much less prone to cracking and seizures.

This is the biggest bore we offer for the 2004 CR125 because the cylinder design does not allow us to go bigger.



Leave a Reply

Your email address will not be published. Required fields are marked *