Has been sitting in my conditioned garage for 10 years. Cranks strong but does not fire up. I have great compression of 125psi in each cylinder and strong spark. So, it prob a fuel issue. I am in process of cleaning the 3 carbs and replacing all fuel hoses, filter, etc. I have new plugs. Once I have cleaned and reassembled and still does not start, recommend steps I should take? Thank you!