I think the dude got his numbers mixed up... Wiseco use to do a 720cc piston kit for the KZ650 - 720 VS 920 is probably a typo and a lot of people think that boring and stroking are the same thing.
If it is stroked there will probably be a spacer plate under the barrel... if it is truly 920, it would have to run a 70mm piston (biggest aftermarket made) and a 6mm plate under the barrel - you would not miss a 1/4" plate under the barrel!
70mm bore x 60mm stroke = 924cc
Also that type of motor would not run well on stock carbs or without an oil cooler so those are things to look for...
There have been some stroked 650 cranks but I would believe maybe only a handful at most out there at all... extremely rare and unusual.
I think the dude got his numbers mixed up... Wiseco use to do a 720cc piston kit for the KZ650 - 720 VS 920 is probably a typo and a lot of people think that boring and stroking are the same thing.
If it is stroked there will probably be a spacer plate under the barrel... if it is truly 920, it would have to run a 70mm piston (biggest aftermarket made) and a 6mm plate under the barrel - you would not miss a 1/4" plate under the barrel!
70mm bore x 60mm stroke = 924cc
Also that type of motor would not run well on stock carbs or without an oil cooler so those are things to look for...
There have been some stroked 650 cranks but I would believe maybe only a handful at most out there at all... extremely rare and unusual.
on a 903 I pulled a plug raised piston to tdc and with a small pen light I could see the top or I should say the side of the piston crown revealing wiesco's.
