Hi All,
I thought it a good time to inject another Yamaha transplant! This is the MH1 upgrade for the old Mini. We are using the Genesis 120 carby motor. The yellow ship is one that I am building at the present. All the mechanicals are completed and in process of modding the cooling system per installation and then on to the electrical. This ship will be ready for testing in the coming months.
I have rebuilt the engine. It was purchased from Ebay with no good history and with the required updates from Yamaha it was the prudent action. With what I found upon disassembly and inspection, I would recommend that all donor engines be gone through. As in the case of John from Millennium found out (pics attached of his engine)! I'm in process of rebuilding his engine also. I will be rebuilding my engine before I install in my ship. The rotating assembles in both engines were in good shape, the problems are with the valve train/drives. Though the root problem being in improper jetting in the case of Johns engine and I will assume some from poor maintenance of its past life in a snowmobile.
HobbyCad, There is no ,lets say guide lines, to the placement of the oil tank. The best is to keep it as close to the engine as feasible and for ease of access to the tank. Yes you have to have a radiator pressure cap and a coolant recovery tank for the system to work at its proper efficiency.
Cheers,
Rick