Re: Just got Suzuki DT-85
Hi,
1. Replaced shaft: any document showing his dad actually bought a new or second hand shaft?
2. Skeg: You can use a skegguard if you want, if you have 2-3 inches of skeg remaining.
3. Oil injection: 2% oil (50:1, gas

il) is what you should use now in gas.
I do not know if you should try to get the oil injection system work again. Just clean the oil reservoir and check all houses etc. You can try it but still use 2% oil in gas so You do not break your outboard because of poor lubrication in case oil injection system does not work. See if oil is consumed in the oil reservoir.
The outboard will run better with oil injection system, oil supply is variable by RPM (150:1 at low rpm, at full throttle 50:1). You will really get little to much oil at low rpm without oil injection.
4. Bent prop: Maybe a Propulse prop
http://www.propulse.se/english/index.html can be an alternative?
Make sure the propshaft is not bent! It will give vibrations You and the outboard will not like at all.
A trick is to take the prop off, then turn the propshaft and use a pice if metal or similar close to the shaft and se if it stay same distance all the time. That will at least give an indication if the DT85 shaft is reasonably straight or bent.
If You post Your DT85 serial nr it is possible to tell what Year it is. It is good to know if you need spare parts. Good source is brownspoint.com (Parts Look-Up).
If You decide to start using your DT85 it is probably wise to invest in a new inpeller kit unless You know it has been changed in a year or two or similar.
New spark plugs and new oil (plus gasket on lower oil plug) in lower unit is wise to use . And grease all grease points also with water resistant grease.
Unless you know it, if you have NA12S remote control box, you press key in to activate chocke before you turn the key when outboard is cold. That way it will start much easier. You have on NA12S also a lever you can move up to increase rpm while in netral gear.