Originally posted by lemtech
what sort of routine do you use to run the engine in.
This a quote from Serpent's manual.
"Running in the engine on a run-in bench
Using the Serpent Run-In Bench (#3400) makes it a lot quicker and easier to run-in the engine. Richen the main needle by ½ turn, and run the engine for 10 minutes at low RPM. Then run the engine for an additional 15 minutes at medium-high RPM at the same richness setting.
Install the engine in your car, and run the car through 3 more tanks of fuel while adjusting the carburetor to achieve a good top-speed."
I would add: Let the engine cool off completely between tanks, and the first tank do it heat cycling every 2 minutes.