I've got this 1994 JD 265 that I've had for 4 years that has a really strange problem when I try to start it. Lately the tractor wouldn't start at all and all it would do was turn and backfire. A complete checkup was done and many parts including the carb were replaced. It seems that everything is in great shape for a tractor of that age but it still won't start.
Then strangely enough by some fluke a mechanic friend of mine tried starting it when the tension spring for the transmission belt was removed. It started beautifully. Then when he tried to start it with the spring back on all it did was turn and backfire again. So now when I need to use it I have to start it with the tension spring off and then once it's going I put the spring back on to be able to move around. Very weird and annoying. Even the senior mechanic at our JD dealership can't figure it out. Why would having the tension spring for the tranny on affect how the engine starts? Is it causing the engine to strain too much? Has anyone ever seen anything like this?