ORIGINAL: unclecrash
ORIGINAL: Xairflyer
so 25:1 is one part oil 24 parts fuel not 25 ? interesting.
If you have tuned to 40:1 and decide to add a bit extra oil next time so it is say 37:1 you would now be running it too lean !! so not really a good idea to add a bit extra oil.
You have it backwards !!! The more oil the richer you run. Take the oil out and you run lean and burn your motor up Period!!!!!
What we are talking about here is the air/fuel ratio not the oil/fuel (gas) ratio
In a 2 stroke if you remove the oil the damage is caused mainly by the lack of lubrication, the oil is not really needed or wanted in the combustion cycle.
You mix air and fuel to make combustion, the higher the ratio of fuel to air the richer the mixture, so if you add more oil you are reducing the amount of fuel (gas) so less fuel means higher air content which means a leaner burn.