have a listen

StrokerScamp said

There are two set screws for timing on a slant. One on top where you can see it, and one underneath where you cannot. Sounds to me like as you advanced the timing it got better and better until you could not put anymore timing in it. I believe someone may heve stabbed the distributor in wrong. Loosen the second screw underneath and put more timing in it and see if it continuse to improve.

Click to expand...

i wasn't gonna go there as you said why...

but...

loosen the easy to get to adjuster and set it in the middle and lock it down...

now get a 7/16 open end and climb under the passenger side tire... its hard to see but on the under side of the dizzy near the oil pump there is a bolt like the one on top... loosen it just enough so you can turn the dizzy...

now go up top and reset timing for what you want (wouldn't doubt it will take all of 30 at idle) but take it to 15 or 20* and shut off the engine. new tighten that bolt underneath the dizzy... now you have adjustment in the range you want...

it is VERY critical you have that thing curved immediately... you will shatter your top rings...