Every banshee owner should have these three tools..... flywheel puller, clymers manual, and a leak down test kit.....
There is another thread on here where guys were going to Home Depot and putting together a leak down kit. Should cost no more than 20-30 bucks. Couple rubber caps and hose clamps for exhaust ports, a pvc cap for intake opening and for the other intake a gauge. Use a bike tire hand pump as you are using very low pressure like 6-7 pounds no more. Spray motor with soapy water. If you can't see where leak might be check trans breather lines as right crank seal will pressurize trans. If nothing you'll have to remove stator cover and spray that seal down. There are some helpful folks on here.