[Racer x]

I put the engine together with LOTS of motor oil and assembly lube. Then when I put te engine in the bike I hook up everything. When I go to start it. I kill the ignition. I can crank my engine with the bar switch turned off.

I crank the engine for about ten seconds. I also prime the oil pump with petroleum grease.

For a street bike I try to start it up and begin the moto man procedure ASAP. But I can't ride my bike on the street.

So I let it idle for a couple seconds and shut it off. Then make an appointment for a break in on the dyno.
That can take all day with the cool down. So a friendly dyno shop is a must. It is fun to watch the smoke stop as the engine breaks in and the rings seal.

Really ,most engines are just put together and put into use immediately. Few have problems.