I have an 04 husky cr 125 and the fuel ratio i had is 32-1 and it fouled on me! i just go around the yard but sometimes on trails. should i go to a 40-1 ratio? or a 50-1 ratio?

Yes 40 - 1 mix is a common race mix and if you dont do weekly maintenance and regular rebuilds you would be better at 32-1 33-1 mixes as this is more oil to fuel mix so better lube and lower burn temperature inside the motor.
when changing to higher oil mix make gradual changes to the fuel mix 1 tank at a time and record your ration as your bike will respond to the changes sometimes well sometimes bad but if you do small steps and record the result you will know what mix is best for your area and bike
In short the more oil you can give it and still ride well the better fore engine life (within reason) but you will lose some performance compared to less oil mix like 40 - 1 ratio (race mix)

Hi i had the same problem with a 2003 rm 250 and it was the crank shaft oil seal i replaced that on the clutch side and i put in a new plug and took it out it was spiting oil for bout 10mins of riding and then it was fine so maybe try that seal hope tht helps

You need to use a 2 stroke motor oil. Look for oils that say 2 stroke motorcycle oil, injector oil or smokeless. Do not use a standard automotive motor oil, your bike will smoke. It should be pre-mixed with your gasoline. I am relatively sure the ratio is 32:1, but you should check your owners manual to be sure. At this ratio you would use 4 ounces of oil to each gallon of gas. This ratio allows for an all-around use of your bike. If you are not going to use the bike at high speeds for extended periods, you may want to consider a different fuel/gas ratio - 50:1.

The above information is recommended for a Stock motorcycle.

Regards.

if your still fouling plugs then you still need to go with smaller # on main jet...are you spooging allot out of pipe and muffler? then your to rich still,smaller jet size!!!! 32:1 is a good mix ratio

32:1--40:1 any less than 40:1 And you take risk of damaging engine(crank and top end),Any more than 32:1 and it will smoke real bad and foul spark plugs alot.....

What model???
Almost all dirt bikes are 32:1. and then jet to get a brown colored plug.

differnt brands of oil, suggest different ratios. The oil packaging will give recommended mixes
starting at 25-1 for the cheaper mineral oils, to 50-1 for the more expensive synthetics.

For the gas tank= 2-stroke motor oil mixed at 32:1 *stock mixing ratio* [that's 32-parts gas to 1-part oil]. **[I personally use a 40:1 mixture for trail riding,..and 50:1 mixture for racing at the local MX track].

32:1 is the official ratio

If you run it hard or wide open all the time you can go as high as 25:1 so you have more oil to keep the engine cool and oiled. If you putz around on it then you can go as low as 40:1 so you don't foul plugs and less smoke.

i would mix it 50/1 it will make your bike run a whole lot better