I just replaced timer base, power pack and rebuilt carbs. it's running much better but still not right, idles rough, surges and engine bucks until I rev up then everything starts to smooth a bit . could this be timing issue? any ideas, it seems like its missing but i am getting spark on all 4 and compression is same in all 4. really frustrated, thanks for all the help so far. Model # 140743S please help if anyone has any suggestions
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