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I have a savage with a .28 sts engine in it and i went to start it a run it in fir the first time, started up great first time and then about after 30 secs or so the revs started to blip and then all of a sudden they shot up to full throttle carb was only about 1mm open, has anyone had this problem or know what the cause could be.

pininfarina

iTrader: (16)

try this thread
STS .28 Engine Thread

pk

happened to me too. thankfully only once. I suspect an air leak in my tanks primer.