just got a kasea 150cc buggy and it won't start. checked spark plug and cleaned carb, even flushed gas tank. will sometimes start for a few seconds and then dies. I think that it may be that the timing is bad. any help would be appreciated.

hold old is the buggy? and has it been sitting for any length of time?

I have no idea how old the buggy is, when I went to pick it up I started and drove it for about five minutes. it sat for about two weeks, and now it doesn't run

check the fuel lines for cracks, pull the carb back off and check the intake for cracks and all of thejets. sometimes a very tiny piece of trash will get in the jets and block then.

also pull the choke off and test it to see if is working.

Get some seafoam put about 1 oz per gallon of gas.
use 89 or higher gas.
take the air box off and filter try to get it started with out these. maybe use some ether.
ground your spark plug see if you get a spark. change the fuel filter. check lines and hoses.

these are in no order...
hope that helps