925cc Stealth Big Bore Kit // 2012-2017 ZR/F/XF/M 800/8000 ProCross/ProClimb

ELEVATION: Please Specify When Ordering
FUEL: 91 Octane Premium Pump Fuel

Riding Elevation:
Cylinder / Head Core Options:
Clutch Kit: Hypershift Clutch Kit (Add $299.95)
Single Pipe: Speedwerx Single Pipe & Y-Pipe Kit (Add $885.95)
Lightweight Muffler: Lightweight Muffler (Add $319.95)
High Flow Intake: High Flow Intake Vents (Add $25.99)
Billet Exhaust Valves: Set Of 2 // Billet Exhaust Valves (Add $241.90)
Fuel Controller: Power Commander 5 (Add $399.99)
AutoTune: Single Channel AutoTune For PCV (Add $324.99)
Boyesen Reed Valves: Boyesen Rage Cage Reeds (Add $329.95)
Throttle Body Boring: Throttle Body Boring (Add $300.00)
Qty: - +
   - OR -   


Kit comes complete with cylinder boring, porting and plating, custom pistons, base gaskets, our Stealth head mod kit with your choice of 13:1, 14:1 or 15:1 compression ratio inserts, and machining of your stock exhaust valves (our light weight aluminum valves are also available).

Kit requires premium 91+ octane fuel.

2007-2009 model cylinders will see 170+ HP and over 115 FT Pounds of torque @ 7700-7900 rpm.
2010-up models will see 188+ HP due to the better port layout of the stock cylinders.

NOTE: Your stock cylinders and head need to be sent in for exchange, outright cylinders and heads available upon request at an additional cost.  Kit also works great on turbo equipped machines.

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⚠WARNING: Cancer and Reproductive Harm — Speedwerx, Inc. Prop65 Warnings or

These items are intended for closed-course competition only. Alternation of emissions-related components can constitute violation of federal and/or state laws. Substantial fines and penalties can result if used for other than closed-course competition use.