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12HP Briggs and Stratton Model 283707 Type 0148 01?

When attempting to start ,it blows back through the carb.Valves are not stuck.How do I check/adjust the timing?
Thomas McAuley, May 2008
u take the caseing off and look at the cam shaft to see if the little dot lines up with the line on the crank shaft

dustin, November 2008
I have a tractor with motor briggs & stratton 12HP 1/c model 283707, type 0217 - 01, code 91100811. The block key starter is cracked. Were i can found a new block contact ( block with five contact L S M B G)
thank you!!

LUIS, August 2008
do you mean ignition timing ?

brian, May 2008