Setting your rotor to Number one just gets you in the ballpark. You will need to turn engine to #1 TDC with a small rod/dowel into the #1 Cyl and feel the piston come up until it stops and then go down, then turn it back until you feel it go back up, you will be able to find a happy medium , that will be TDC, maybe not exact, but close enough. Then look at your timing mark, if its not "zero" then the balancer has slipped, now make your own mark and thats your new TDC mark. At least you will be able to set your timing while you are waiting to replace your balancer. Most people would never know there balancer had slipped until they went adjusting the timing. When they check it "wow, thats way off" then they set it where they usually do, and it runs worse. Big red flag.
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