810 piston kit?

can you put an 810 piston kit on a 650 engine or do I need to find a 750 engine. I am just wondering what the best options are for beef'n up my 650.

The 650 sleeves are not capable of being bored over to the 810. you probably already know this but they do make a 700cc wiseco piston kit for the 650's. But for those who want more there is a solution. You can find a set of 1980 kz750 cylinders and have them bored over. This is your solution to having an 810cc 650. The cylinders and head from a 1980 750 are swappable for the 650 parts. I dont know for sure, but u might be able to have 750 sleeves pressed into your block also, but this will probably cost more than just finding the cylinders on ebay.

Thanks for the info. I deffinately want more power. I would like to be able to at least give some of the newer bikes a run for their money. I just don't know if it is going to be worth my time and money to mess with my 650 or if i need to get a 750

First of all it is definately worth the money. You do not need to get a 750 because you can prolly get cylinders and a head from a 750 for under $100. If you can find a set of gpz cams they are the best. $150 later you will have a 650 that is equal to a 750 and still be able to keep your kick starter. I used a 1981 kz750 bottom end for my project just because its what i had around, but i would definately like having a kick starter to use when i wanted. I am running 810 pistons, ported gpz head and cams. Definately a huge difference from stock. Never a dull ride with this bike and it continues to surprise me. I made a few quarter mile runs against a buddys r6, i didnt win but i definately gave him a run for his money in the first quarter mile. Check out my build. Search 810 streetfighter in the search bar.

650 block can be sleeved for an 810