It was unfortunate that all my pictures were lost when the photo host shut down this the reason for the vanishing posts here. No pics equals rest of post worthless. That being said an enterprizing individual happened to save all of my rants so there is hope at some point they will be available with pictures.
Balancing and engine the best and easy way first requires you to get the counterweight in the correct position with respect to the keyway. This is something that is messed up often in India. It is very important step and something you cannot pass by if you want the engine to run as smooth as it can be. To do this requires that you get the engine exactly at top dead center. Then place vertical marks on the flywheels. After that you place the flywheels on a balancing stand as Bruce suggested your marks that you placed previously must be vertical when the flywheel is allowed to freely rotate with the heavy spot down. The Next step is to match the offset weight in the flywheels. The easiest way to do that is to add weight to the flywheel with the least amount of offset weight. To check offset weight requires that the lines you mark on a flywheel be held horizontal by temporary weights attached to the light side. once you have the weight in the correct position and respect to the key way and equally weighted both flywheels you reattach them to the engine and adjust the offset weight to smooth out the operation. If the engine has too much offset weight it will be a scooter while running it will tend to walk across the floor. If the engine has too little offset weight it will be a hopper, up and down. Realize that you are attempting to balance a up and down motion which is the weight of the piston and half of the connecting rod via a circular motion with offset weight in the flywheels. None of these engines well set perfectly still but they can be made very good if you take all the steps. My first attempt at balancing was via the chalk method and attaching weight and I was not successful at it either.
The link provided here is of a metro 61 that I balanced with my method.
https://youtu.be/p2YwtlfAVfc