I have bladez moby that im being able to start but not to keep running, i used the ratio of 30:1 oil mix im not sure if its ok

the mix is 50:1 so the weight to volume will not matter
if you have a 1 gallon tin the amount of oil will be 1/50 of the gallon
1 gallon =128 oz so a ratio of 50: 1 would be 1 gallon of fuel to 2.6 oz of oil or 1/50 of the gallon calculate the oil required by dividing 128 by the recommended ratio figure (128 divided by 20 or 30 or 40 or 50 to get the oz amount of oil)
the thing is that the mix doesn't have to be exact as long as it is not tool short on the oil
so a mix ratio of between 30:1 to 50:1 will run in 2 stroke engines but a mix of 60:1 will cause problems
A good mix is when you can see a faint oil smoke when operating
too muck smoke and there is too much oil and no smoke too little oil
the major factor is--- do not use e-mix fuels

Two cycle engines run on a mixture of gasoline and oil. Each engine type is designed to run on a specific gas-to-oil mix ratio.
IMPORTANT: Use only oil that is labeled for use in "Two-cycle" or "Two-stroke" engines. Home Depot and other stores now have "premixed fuel" of gas and 2 cycle oil.
To mix two-cycle fuel, start by putting correct amount of oil in gas can. Then slowly add correct amount of gasoline. Do not try to mix gas and oil directly in gas tank of equipment.

IMPORTANT: Do not use any fuel that is over 30 days old. Do not mix more fuel than you are likely to use in a month. Old fuel can gum carburetors and prevent starting. Always use fresh fuel.

The chart below shows correct amount of oil per gallon that each mixing ratio requires. Expect that yours will be between 32 gas to1 oil and 50 to 1. 32:1 and 50:1 are most popular.
Ratio GAS:OIL UNITED STATES OIL per 1 U.S. GALLON Gasoline
(128 oz.) *INTERNATIONAL OIL per 1 IMPERIAL GALLON Gasoline
(160 oz.) *INTERNATIONAL OIL per 1 LITER Gasoline
(metric) 32:1 4 oz. 5 oz. 31.25 mL 40:1 3.2 oz. 4 oz. 25 mL 50:1 2.6 oz. 3.2 oz. 20 mL

First and foremost. The right mix of oil and gas is essential to any 2 cycle engine running/performing properly.
I always use at least a 90 octane gas. My Poulan is a 40:1 ratio mix, and I use synthetic oil. I only keep enough oil and gas mix that I am going to use within say 2 weeks. This keeps my saw running great.

I have also bought a carb tool to make sure I am running tip top. You can find a very very useful video of this on YouTube posted from donnyboy73. I have added the link below.
http://www.youtube.com/watch?v=3Lw0pJcEPYo

Hope this helps.

Do not use pre-mix fuel. Clean carburetor. Check age of gas. Cannot be more than 30 days old.
Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio (1 gal.) Gas to 3.2 oz. Oil) .Do not use old or stale oil/gas mixture. Always use the proper oil/gas mix. If you do not, your engine will suffer rapid, permanent damage.
check age of gas. Cannot be more than 30 days old.
Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio (1 gal.) Gas to 3.2 oz. Oil) .Do not use old or stale oil/gas mixture. Always use the proper oil/gas mix. If you do not, your engine will suffer rapid, permanent damage.

Check age of gas. Cannot be more than 30 days old. Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio (1 gal.) Gas to 3.2 oz. Oil). Do not use old or stale oil/gas mixture. Always use the proper oil/gas mix. If you do not, your engine will suffer rapid, permanent damage. May need to clean or replace carburetor.

Remove the spark plug and test for snappy blue spark. If ok, pour a little fuel mix into the plug hole and try for start. If it pops several times, check the fuel filter, air cleaner, and muffler for plugging. Check the condition of the fuel lines and the primer bulb. Did you make sure that you used proper mixing of the fuel/oil? Be sure to use a modern synthetic saw oil with fresh fuel at the required ratio and use it's own can for mixing/storage. Shake the can thoroughly just before filling the saw. Hope this helps!

there a 40 to 1 mix i all ways use a 30 to 1 mix i look at it this way,,,
if i see smoke the bearings are getting oil to them? ok????

Most likely not the answer you are looking for but here is a shot:

Pick up a bottle of the Echo brand 2-cycle oil. It will say "Extended Life" on the labeling. This is meant to run in Echo products, but it is a very FINE and well engineered oil. Mix it according to label directions for 50:1 ratios. (2.6 Oz. to 1 Gal. Gasoline)

When mixed at this ratio it provides MORE than adequate engine protection for ALL 2-Cycle engines, including those that run in 40, and 30:1 ratios.

I mix one 2-cycle tank to label instructions on the Echo oil for 50:1. It handily runs in my Echo chainsaws, non-echo trimmer, Poulan Pro leaf blower, etc. They all run different ratios, but THRIVE on the Echo mix without as much oily residue and smoke to boot!

CAUTION: I do not know of ANY OTHER MAKE of 2-cycle oil that CAN DO THIS *SAFELY*.

Remember:

Always mix your 2-cycle fuel starting with *fresh* gas.

Mix only that which you can use in 30 days.

Use 89 Octane fuel to make your mix in small piston 2-cycle engines.

Clean and re-oil intake filters @ every 10 hrs. operation time. Check and re-gap your plug when you service your filter!

DRAIN unused fuel from tank back into gas mix container. Restart and let engine idle to run any remaining fuel out of engine and carb. Storing fuel in ANY 2-cycle longer than two weeks is going to gum them up and nothing short of a carb rebuild will get them sputtering back to life again!

Most saws built within the last 30 years or so can be run with 40:1 using modern synthetic saw oils. A number of late model units run 50:1. Make sure to premix the fuel and oil before adding to the saw. Hope this helps!

The Left knob needs chain oil. Available in most hardware stores. The right is gas mixed with 2 stroke motor oil. Usually a 50:1 mix. Ie. 50 parts gas to 1 part oil. 2 stroke oil comes with a built in measuring tool and directions printed on the bottle.