This belonged to my Grandfather and he purchased it new in 1979. I attempted for many years to buy it from him. It was kept under his porch deck and when he finally turned her over, the wheels were flat and buried in a half foot of mud, it was rusted out, the motor was locked up and he had lost the key. It took many attempts and a lot of help from many different people to get the motor broke free and get it running. It runs pretty good at top speed! However, I have been riding Mitch recently and after it warms up it takes longer to shift and longer to reach max mph. Also most recently. when coming to a stop and putting my feet on the ground the bike jerks like it wants to take off. It will do it over and over again while sitting idle. It just keeps surging/jerking. Doesn’t really pull forward but jerks in a forward motion. Any ideas what is going on? Thanks and I can’t wait to get all the kinks worked out!!