Home Forums Tech Talk Leak Down – What Is It? Reply To: Leak Down – What Is It?

Greg Wright

Actually I think they are looking for air leaks. On engines with restricted carburetion example Yamaha Jr, Sportsman with the WB55 carb and also with Comer K-80s some builder have intentionally leaked air to the engine via intake manifold or crank seals. More air=more fuel+more power. They can be a bitch to start though.

Greg Wright
Rapid Racing Inc.
Vintage B-Stock Pilot
"When in doubt Gas it, It won't help but it ends the suspense."