250 1985 Yamaha YZ250

Im having a problem with my 1985 yz250 as well its getting spark and fuel but it won't fire and it's leaking fuel out of the exhaust port any reason why it wouldn't fire
 
The carb on it is from my previous 1985 yz 250 that locked up the crank 2 summers ago it did work on the old bike the new one i bought from a guy that laid it over and the gas tank cracked and it leaked gas whenever he tried to start it the carb was messed up so i changed it
 
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