Fuel screws and throttle shaft idle screw impact idle, secondary throttle shaft adjustment seems more sensitive than primary.

When it was fired after running the valves yesterday it's feels normal above 2K rpm, between 1-2K is where it's weak and vague. While getting it up to temp when it would go below 1K heading to a stall, pumping the pedal lightly to catch it resulted in a backfire and little carb fire. That's leading me to think it "could be electrical, somewhat similar trait to the weak distributor ground.

After reading MSD's troubleshooting list http://www.msdignition.com/troubleshooting.aspx I'm going to check the magnetic pickup value and verify conditions listed in timing fluctuations, and improve tach ground or just eliminate the tach right now.

My SnapOn Timing light pick up clamp isn't directional but I'll experiment with flipping it just because.

:thumbsup:

Skip - That would be great as the conservative rebuild after the fire was done knowing this is not my ideal motor. LSx or dry sump LS7 would be nice
but since I'm currently unemployed for the first time in 36 years it would be a tough sell on the wife. :D

Just kiddin' Sieg. :D

It was just a friendly shot across the bow at our friend Flash68. :unibrow:

Hey I wasn't defending just clarifying conditions..........I like your intent :rofl:

. Don't dismiss a carb tuning issue. I'm leaning in that direction.

Agreed, it's going back on the bench for inspection. :thumbsup:

Sieg, didn't you put a new carb on with this new setup? What was wrong with the old carb? What size carb is it your running now and what was the old carb size?

The old 650 Demon was BBQ'd. Holley 650 Ultra HP now.

http://photos.smugmug.com/photos/i-b...-bZLQm2X-M.jpg

That's a well done carb right there.

You changed the carb along with the cam? from your original setup, which I assume was running well? Correct? You're still running the same, but new ignition system?

If the cam was changed, any chance the timing chain wasn't correctly aligned? Was it degreed?