What is wrong with the wheel, they can be very difficult to remove. As for the solonoid that won't stop you from getting the motor running, it just means that you will be able to start it with the key later. I'm not sure about the 10 tooth sprocket, it has probably been used on all the Greenies for many years so is probably available from any Greenfield dealer, just check that they are the same, I see no reason why they would have changed it on different models
