I am using Steve Ruth in Suffolk UK, to build the engine, and Cuervo Racing / High Desert Dyno in the USA for the parts and Cylinder Head porting.

My bike is a 2008 XTR, fitted with a DNA Stage 3 Airbox, a Power Commander, and Carbon Cans Exhaust.

I have already sourced a spare engine to use.

Specifications

+1 mm Valves
Uprated Springs
Cuervo Racing Ported/Flowed Cylinder Head
High Desert Dyno HDD5050 Camshaft
Bored out to 734cc with a CP 105.5mm 11:1 Piston
Bored out throttle body 2 or 3mm


To fit this piston, Steve is going the route of : boring out the existing Cylinder, and fitting a liner. This seems an easier option than fitting a Raptor Cylinder, and doesn't need Nikasil Plating either.

A more "lengthy" thread on this conversion is at
http://www.xt660.com/showthread.php?t=14763

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2008 XTR Mods : DNA Stage 3 Airbox, PC111, Carbon Cans Ovals, Steve Ruth built XTR734cc Big Bore with - High Desert Dyno (HDD)/ Cuervo Racing Gas Flowed / Ported Head fitted with +1mm Valves & uprated Springs, HDD 5050 Camshaft, HDD +3mm Throttle Body, CP 105.5mm 11:1 Piston, Custom Mapping, Piasini ECU, Renthal 613-01, Barkbusters VPS, Pivot Pegz, Touratech Bashplate, Foam Grips, Kev's O2 Sensor Mod, Kev's Extra Coolant Cooler, Wilbers Progressive Fork Springs and Rear Shock