CR 145 Big Bore/Stroker

Motorcycle Honda CR139

Please call to order 608-842-0680

Special Price: $1,650.00


Quick Overview

CR145 Big Bore/Stroker Specifications: Fits 1994-2007 Honda CR125R


Product Description

Bore: 56   Stroke: 59   Actual Displacement = 145.317

Engine Modifications Included:

Cylinder: Bore, Port and Plate.

Power Valves: Machined to match big bore cylinder

Head: Re-chamber to work with the Big Bore piston and stroker crank.

Crankshaft: Stroked and balanced.

Crankcase: Modified to clear stroker crank.

Blueprint: Calculate deck height, squish clearance, trapped volume, port timing and compression ratio and list on your permanent Spec-Sheet.

Notes: This kit requires you to send us your entire engine for modification, with kick starter and shifter.

Notes: Prices listed are to install stroker kit parts in good condition engine. Should your engine need rebuild parts there will be additional charges. We will call for approval before we install any parts that will have additional charges. (example: rod kit, mains, main seals, trans parts)

Pre-2005 engines require the purchase of a solid steel crankshaft.


The CR145 is a great engine set up for any year Honda CR125,  The stroker crankshaft increases torque significantly and the much lighter custom Wiseco piston winds up super-fast.  The porting allows for a big top end pull with lots of over-rev.

Dyno Chart: CR167,145,134str,125




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