Originally Posted by 8pitcher
You found the problem. That's good
Right!? I thought so
It's nice to be right about something at least once in a while.
Tonight, I put my timing tape on my harmonic balancer, and I ran a timing curve from 800 to 2600 RPM (with vac advance plugged of course). I had the GF verify RPM from the cab while I turned the idle adjust screw in to get the various RPMs.
I wonder if it's common for the timing marks on the timing cover to be off by 3 or 4 degrees. I set the timing to 8 tonight before the timing tape, and when I checked it against the timing tape, I was closer to 12 :/
I swear I got the diameter of the balancer right, and used the appropriate tape. And lined it up with the 0* mark.
Either way, it's at 8 according to the tape, and it goes to a little over 24 at 2600 RPM. The curve also kicks in kind of late, I'll lighten up a dist spring or two tomorrow.
I also slammed a set of 59 main jets in the bowl (60 previous), and that made a ton of difference, but I know it needs more. I've been tuning motorcycle arbs for a while, so I can usually dial in any kind of rich/lean mix or jetting by feel. I haven't dealt with timing before, so all that is new.
BTW, the chart should say timing* instead of "in Hg." It was late