The best article I've read on the web concerning 4-stroke engine break in, can be found here: http://www.mototuneusa.com/break_in_secrets.htm
--Ray
engine break in is very important, proper break in will help ensure long engine life.
After the break in period it is not an issue.
The myth is that it takes about 1000 miles of "babying" the new engine. Then change the engine oil again.
This might not help... Get a new one.
For the first 1600 km's or 1000 miles on a new engine just use regular oil. The reason being is that you want MORE friction in the engine to help the parts wear properly for a good "break in", synthetic oil has such good lubrication properties that it can interfere with proper engine break in.
It is not the speed that will ruin a new car engine, it is too much heat. Do not drive fast or rev up the engine for more than a minute or two, then let it cool off. This is actually a good way to break in an engine.
Yes, it is very important for you to find out the correct engine code for your car. Honda specifically posts these engine codes for cars to help you with your new car.
If the engine has a flat tappet camshaft you will need to break in the cam first. Start the engine and run it between 2000 and 3500 RPM for 30 minutes, gently changing engine speed between 2000 and 3500. Do NOT let the engine idle while breaking in the cam!!!! If you encounter any problems during cam break-in, shut the engine off, address the problem, then resume break-in. Once the cam is broken in, Change the oil and filter, and simply drive it normally, but don't run it hard for at least 1,000 miles. After 1,000 miles, everything is pretty well seated and the important wear patterns have been established, so you can drive it any way you want.
Break it in as if it is a new engine start by setting all your carb needles back to factory settings, even a bit richer if possible as long as the engine stays running without flooding. heres a good guide to go by http://www.rctech.net/forum/australian-racing/143096-nitro-engine-break.html
It is a slang term for a brand new or rebuilt engine. It is also used to describe the break in period of a rebuilt engine during which you take it easy on the engine for the first 500 to 1000 miles.
Engine crankshafts usually break when there is too much pressure on them. Some have flaws and may break under normal use.
Decomposers do this important job for an environment. Decomposers break down organisms that are no longer living. They break them down into nutrients that can be used again by new plants.
Yes, they can break or just wear out.