This information is for all aircraft that have metal, poly or non-fiberglass tanks (WITH EPOXY RESIN), not Polyester resin:
- Buy fresh Ethanol premium gas preferred from Chevron, BP and Sunoco.
- Use either Amsoil Interceptor OR Quicksilver PWC oil (any of the 3 types of Quicksilver is fine)
- Run Premix at 40:1 ratio. (16 ounces for every 5 gallons of gas)
- DO NOT EVER USE NON ETHANOL GAS (other than 100LL Avgas which is acceptable). Rotax has a warning that it is “old stale gas.”
- If you insist on running oil injection you MUST ADD 3.2 ounces of additional oil for every 5 gallons of gas (a 200:1 ratio). For an oil to be awarded the TCW-3 rating it must run on the Yamaha 350 at 200:1 at full throttle for 2 hours. If your oil injection pump fails or the oil injection system fails, this will save your butt.
- When shutting your engine down, first rev it to 3500 RPM and pull on the enrichment chokes (or give it 2 big shots of primer). This will be like a mini fogging and protect the internal parts of your engine.
- Fuel life is 2 months, depending on the amount of moisture it’s exposed to. You can add Stabile to the fuel if you know your flying may be limited.
- AvGas 100LL is the very safest gas you can ever use. I have rebuilt 100+ engines that used it 100% of the time. Don’t listen to the know-it-alls.
- THE BIG DEBATE is the 40:1 PREMIX RATIO. I been rebuilding the Rotax 2 stroke crankshafts since January 2011. Since then, I have learned a lot. Most other manufactures use 2 piling slots at the lower eye in the connecting rod to supply more oil to that prone to fail bearing. WSM, a large improvement company, builds replacement rods for the 582 engines with the required 2 oil slots. Now PLEASE understand this: every two out of three 582 engines that fail, does so in the lower rod bearing, which burns up causing the failure. Since I started rebuilding these crankshafts I have NEVER had one single 582 lower rod bearing fail. WHY? 70% of the cure is 40:1 gas oil ratio. The other 30% is due to the double oil slot.
The only time ethanol fuel is a concern is if you have a Fiberglass fuel tank!