Poor running Z1B

Hi all,

I have a '75 Z1-B, with a "Dyna S" ignition installed, (stock coils). Starts/idles fine, but is down on power; acting as if timing is not advancing. Just did a valve & ring job,cam timing is spot-on, carbs are clean & synced. When Dyna S was installed, timing was set with timing light.
Took for 50-mile road test, and as noted, is down on power; just doesn't have the "snap" that should be there. Did not exceed 5K rpm )or so) for break-in purposes. Airbox is stock, as are mufflers. Any suggestions? Thanks in advance!

pull your advancer of and see if its working properly make sure it's moving freely on the bolt.

I cleaned and lightly lubed the advance when Dyna-S was installed, but will check it again. Thanks!

Would assure all four cylinders are combusting by spraying water mist over exhaust headers while engine idles, to see if water instantly vaporizes off every header.

Good Fortune!