Building a Yamaha dualsport from a XS500/YZ250/Blaster200

I have owned numerous 1978 XS500 Yamaha's over the years but felt the need to build a dualsport out of one. Along came a 1989 YZ250 motocross roller which donated the front and rear suspension/wheels/brakes.Next up was a 1992 Blaster 200 quad for the engine contribution.Here is a quick pictorial review to get us up to date,February 2015.

Stock 1978 XS500

Sport touring trip.Picking up firewood at U.P. Michigan campsite.Road racer,4 hour enduarance at Road America.CR500 engined dragbike.

Dualsport with YZ rolling gear.

Spring ride on Kansas sand roads.

Blaster 200 quad engine donor.

Beat up engine.Note piston skirt.

Out with the 4-stroke.

Bore cases for stroker crank clearance.

4mm hotrods StrokerWiseco forged replacement piston.Boyesen ports added and porting done.

Going together.Figuring out engine mounts.

Double checking things after mounting engine.