hi all, would someone please advise me on the 2 stroke ratio on my txt280, the guy i got it from told me to mix 100ml of oil with 5 litres of petrol, i was told today by another rider it should be 80ml of oil to 5 litres of petrol, wich is it 100ml or 80ml?, im using putoline tt oil with shell optimax fuel, any advise welcome, regards Nick.