Need help with throttle advance problem.

I am only able to advance both throttles all the way forward and only achieve 3000 rpm. It's as if the starboard throttle has reached its full travel and will not go forward any further. The port throttle will advance just a bit more but not much.

Both engines are smooth and wanting more but I can't go any further with the throttles.

Any and all assistance would be greatly appreciated.

Pain it the *ss ain't they! Being anal, I modified the throttles to allow more travel, which eliminated this nonsense.

Realistically, you don't need 100 % full throttle--mine planes effortessly at half throttle (and it's deliberately over-propped. I'll bet yours does too.) The important (to me) thing is that the carbs close, and that the handles are together (twins) at cruise speed. If not, that drives me nuts!

Jeff

The way I'm propped, I get about 3,900 rpms max (3,000 per engine during the Fastjeff Dyno Test).

You're going to have to go through the entire checkout procedure to see where the power is being lost:

1. Use an advancing timing light (borrow from Autozone) to see how much spark advance you're getting. Look for at least 26 degrees total at 3,000 rpms or less.

2. Warm 'em up, idle 'em at 1,200 rpms and--using insulated pliers and gloves--pull then replace each wire on the distributor cap. Note the rpm changes and any cylinder that does nt respond correctly.

3. Do a Fastjeff Dyno Test to seee how the motors compare: At cruising speed (at, say, 2,500 rpms) synch the motors close as possible, then open the throttle on one and note the max rpm. Return it to synch speed, then open the other throttle. If one is dramatically slower, jump on it.

Jeff

PS: I have Edelbrock 1409s and swear by them.