Re: Proper brake-in procedure
This is what I found, now I am confused even more????<br /><br />Start your engine at home base using flush muffies to see that it actually does start and doesn't have any obvious problems i.e. - water leaks, etc... Once it is obvious the engine will start and run I suggest the engine be put in the lake and run for 20 minutes at high idle RPM (750 - 850) unloaded or out of gear. Check the plugs and carefully feel the engine to make sure it is not overheating. Restart the engine and then move it up to around 1500 RPM loaded in gear and vary the speed from idle until you have two hours on the engine. All the foregoing may be accomplished on the trailer. It is time consuming and tedious but it is the basis for long and happy engine life. If everything seems to be okay check the timing on #1 & #2 cylinders on a V-4 or V-6. Use the cylinder with the highest reading and set the timing 2-4 degrees less than the factory specs. If the spec is 24 degrees BTDC set the engine at 22 degrees. Leave the engine at this setting for the break-in period. If later you want more power the timing can be advanced to the factory spec but the engine will live longer if you leave the timing retarded. Don't guess. Use a timing light and set the timing UNDER LOAD, at FULL ADVANCE! Don't run it there other than to check the timing.<br /><br />At this point you can run the boat, cruise at 3000-3500 RPM, periodically giving it short runs up to full throttle. This should continue until there are ten hours on the engine, then your powerhead should be broken in. If you follow the outlined procedures you will get better service from your engine. Be sure that at maximum throttle the engine will turn up to 5500 RPM, the top operating RPM for most 2 strokes. If it doesn't the propeller should be changed until the engine runs at or slightly over the rated operating range with a light load. The wrong prop can cause the motor to lug, overheat or at the other extreme over rev and destroy all your good work. Be sure to check and retorque the cylinder head gaskets.
