my 351 states 40:1 on the filler cap too. I think we have an answer. So in 5 litres of petrol (gallon can) you want 125 ml of oil. remember to mix the oil well as it can stick to the bottom and stay there. if this happens your engine will get starved of oil and die a miserably rapid death.
Steray: 5:1 ? it's not a diesel engine! you must really like the cloud-of-smoke look, lol.
Use top quality 2-stroke oil for chainsaws or similar, or high grade scooter oil. chainsaws work hard.
Al, October 2008
