Yamaha XZ550 stroker build by Dutch Tuner Cees Fick, 80 x 84 bore/stroke makes about 850cc. Driveshaft drive has been modified to sproket drive.
https://www.youtube.com/watch?v=2CH7A5x6jEI
Vey cool. Looks like some downdraft CV carbs but not sure what they're from? Jetting seems to be right based on throttle response anyway. Sounds good, nice work.
I think he needs some larger air filters. Looks rather restrictive for a 425cc gulp of air.
Based on the idle, I wouldn't be surprised if he was running stock cams. It sounded quite streetable. It's good to see our engine taken outside of the box.
I made a 650 out of one, but it was just bore.
What pistons did you use
Iain
NZ
I made the liners from aluminum pipe and them plated. The pistons were custom made by JE.
We used to have a wonderful company in Sacramento (Chromecraft) that would take on small unusual jobs, like building up a crank journal or surfacing and plating fork tubes. No more. Now they are an industrial focused business and no longer accept small jobs. But if you have a fleet of heavy equipment that needs their hydraulic rams re-plated they are the place to go. Sigh.
A lot of info about John Clemens' 650 cc vision engine in this thread.
http://ridersofvision.net/rovforum/index.php?topic=11572.0