Earthquake viper won't start - Ardisam Inc Earthquake Mini Cultivator

Excess fuel mixture and back fire

Sounds like the belt is slipping. Have you removed the belt cover and inspected the belt and the tensioner pulley ? If your model is like mine the tension can be adjusted just below the handles by looseneing the nut where the cable goes into the cable sheath and moving the cable cover further away from the handle. That takes up some slack and will make the tensioner pulley tighter on the belt. If the belt is shot tension isn't going to help.
Try "google" with "earthquake 5070 manual" first option should be a PDF copy of a model 5070 manual. Will have diagrams on how to adjust the cables.

Is it flooded? Plug fouled?

you've found the right place buddy
I keep buying manuals from various websites so I can damn well help u in this..
what chipper is it btw? Like few
websites have some manuals better while some have other brands better

The Viper Engine is a Honda clone. Try a new carb for $15 0n ebay. http://www.ebay.com/itm/NEW-GX160-5-5HP-HONDA-ADJUSTABLE-CARBURETOR-WITH-FREE-GASKETS/121225345625?_trksid=p2047675.c100011.m1850&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D30002%26meid%3Df495007fc18649159ceb1009031e4fad%26pid%3D100011%26rk%3D2%26rkt%3D10%26mehot%3Dpp%26sd%3D261393057447

Hi, inside the fuel tank, regards Phil.

I have the same issue, I thought it was the carburetor so I cleaned it and put it back together, same issue, I put a new carburetor on it same issue, has great spark, if I spray carb cleaner into it, it will start and run for a few seconds even throttle up, but then it dies, and will not start again without carb cleaner spray, and fuel is fresh and properly mixed, very confusing indeed.

Mc43 can’t get it to fire. No spark

You probably need a new coil, if it is a 2 stroke then it will almost certainly be the coil. The defect is very typical and recognizable.

CHECK THE SCREEN ON OUTPUT OF THE MUFFLER. ITS CALLED A SPARK ARRESTOR, THESE GET OIL FOULED AND MAKE EM A BEAR TO RUN . CLEAN IT UP AND SHE WILL RUN LIKE A CHAMP, THE CARB MIGHT NEED REBUILDING ,FUEL FILTER AND A SPARK PLUG IS THE FIRST THING TO REPLACE .. IF'N I WAS ANY HELP VOTE FOR ME ...THANKS.. JAY