"I've lost about 300 rpm a
"I've lost about 300 rpm at WOT. The engine runs fine and the bottom is clean. The prop is perfect.
I suspect that the secondaries on my Holley 4160 are not opening. I have fully opened the throttle (engine off) and checked that the secondaries are not sticking and free to open.
Without having a bud to run the yot while my head is in the bilge, what else can I look for? Am I right to think that the secondaries are opened purely by vacuum?"
"I've lost about 300 rpm at WOT. The engine runs fine and the bottom is clean. The prop is perfect.
I suspect that the secondaries on my Holley 4160 are not opening. I have fully opened the throttle (engine off) and checked that the secondaries are not sticking and free to open.
Without having a bud to run the yot while my head is in the bilge, what else can I look for? Am I right to think that the secondaries are opened purely by vacuum?"