YZ151 Big Bore/Stroker

Motorcycle Kawasaki KX 139

Please call to order 608-842-0680

Availability: In stock.

Regular Price: $1,950.00

Special Price: $1,650.00


Quick Overview

YZ151 Specifications: Fits 1997-Current YZ125


Product Description

Bore: Yes

Stroke: Yes

Actual Displacement = 150.55cc

Engine Modifications Required:

Cylinder: Bore, Port and Replate with Ceramic Nickel Bore coating.

Power Valves: Machined to match big bore ports.

Head: Rechamber to work with the Big Bore piston and stroker crank. 100 octane suggested for most conditions.

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 perminant 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)

Notes: The YZ151 is a top end monster. This is the kit we recommend for “A” class and “Vet pro” riders who want to stay on their 125’s but hate getting yarded by 250F’s on the straights. It has much more torque than the stock engine and revs out even further than a stock YZ125. It makes more peak horsepower than most mod 250F’s so if you can keep up with them on a 125 you will have no problem beating them with this mod.


Leave a Reply

Your email address will not be published.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