Originally Posted by CIMRI
@handpiece .Ok. How about break-in. What is the break-in methode for this engine?
@gansei : what for a break in did you prefer
1 when starting a new engine follow the set up instructions first! Start the engine and let idle at a moderate speed for two or three minutes. Then shut it
down and let it cool for a few minutes. Be sure the piston is not at the top. Repeat this procedure three or four times.
2 Now run the engine on the track, making sure the engine is rich. You should hear a “four cycle” sound. Be sure to let off the throttle going down the
straightaway once or twice so the engine is not straining in its rich condition. Repeat this procedure for three or four tanks of fuel, letting the engine
cool several minutes between tanks. Also, check the glow plug often. It should look new (shiny wire that is not distorted).
3 You can now start leaning [turn clockwise] the maximum needle a little at a time in one hour increments [imagine the needle like the hour
hand of a clock] checking the glow plug often. [I use a glow igniter with a meter on it] I recommend running a few more tanks a little on
the rich side before “Race tuning” When tuning for maximum performance [Race tune] adjust until engine will reach Good RPM then open
needle 1/8 to 1/4 turn.
4 set the low end or idle:
4.1 After getting top end set close, bring model in, listen to the idle. If it is idling fast then it slows down in a few seconds, it is probably
too RICH on the bottom (minimum spray bar). In that case, make it more lean (turn clockwise ¼ turn), then run another lap and
bring the car in again.
4.2 Repeat this procedure until the idle stays high for at least 10 to 20 seconds; at this point readjust the aircrew so the idle is at a
moderate speed. The wheels should not turn, and the clutch should be fully disengaged.
4.3 If you had to turn the minimum spray bar in more than two or three more turns recheck the slide adjustment! [Picco Torque
5 you may need to repeat steps 3 and 4 several times to achieve the “perfect tune”
Be patient. Tuning is the hardest part of gas racing, and is the first secret to race winning results. If you are a beginner, it is highly
recommended that you ask your hobby shop or an experienced modeler for help.
Three last tips
1 Be sure engine is warmed up before tuning
2 always tune from rich to lean. When in doubt, richen up the maximum needle (top end)
3 If you have to turn minimum spray bar (low end) in more than three to four turns from flush, it is a indication the slide adjustment is too loose and
needs resetting (Picco Torque carburetor only).