how do you know if you are useing enough oil on a two cycle

{not when it blows up you did not use enough}

just seems like this year i have been useing less oil

i have a 2004 200 hpdi  yamaha is ther some kind of formula  like

x-amount of gas or x amount of miles???????????

My 2004 Evinrude HO varies a lot depending on how hard I run it ..... about a gallon for every 50 - 75 gallons of gas.

kb .... how is the fishin up there on Freeman and Shaffer ..... I haven't fished them in over 20 years ......

Almost all two-stroke outboards use a ratio of 1:50.  i.e. 1 oz oil to 50 oz gasoline.  Since there are 128 ounces in a gallon, this equates to 2.56 ounces of oil per gallon of gas.

kb .... how is the fishin up there on Freeman and Shaffer ..... I haven't fished them in over 20 years ......

this year on shafer is has been good for l.m. and s.m. freeman good at times but most of the time poor. this last week off the n.e. end of ski island on freeman in deep water smallmouth has been real good. it will be gitting better now after the ski boat's stay home

kb your motor's oil consumption will be regulated by the computer.  It will go from around 100-1 to maybe even more than 50-1 depending on how you are using it.

If you are using less then maybe you are not hitting the throttle as hard as you did in the past.  The closer to wot the more you should use.

Almost all two-stroke outboards use a ratio of 1:50. i.e. 1 oz oil to 50 oz gasoline. Since there are 128 ounces in a gallon, this equates to 2.56 ounces of oil per gallon of gas.

I was always told that was 1 gallon of oil per 50 gallons of gas.

50:1 is only for your carburated and some EFI motors. DFI motor are controlled by the computer so their consumption can vary widely. Evinrudes actually use very little oil. I've never owned a Yamaha but I've heard they tend to use the most compared to the other DFI's but it's still less than the carb'd motors.  

At idle it can be as little as 150:1/200:1.  As rpm increase the oil usage will also.