Ringed Motors are less sensitive and can be easier to break in. make sure your motor is of the ringed version before using these or any other tips. Ringed motors should be broken in very, very rich for the first ½ hour and then leaned out more as time goes on. To richen a motor adds more fuel, while leaning a motor restricts fuel flow through the carburetor. This causes a higher fuel to air mixture for a richer mix or lower fuel to air mixture for a leaner run.

High Speed Needle. Turning the needle valve in to where it stops closes the fuel flow all together. Do this lightly !! screwing in the needle valve with even medium force can ruin the tip of the needle and more. This will make the motor harder to adjust or fine tune later, making your experience far less enjoyable. Also again, keep in mind that when the motor is running, turning the needle valve in will lean (restrict fuel) the motor and turning the needle out will richen (increase fuel flow) the motor.

Fuel. Fill the tank with fuel. I don’t recommend any fuel for break in higher then 15% nitro.

High Speed Needle Beginning Adjustment. From the closed position open (turn) the needle valve out the number of turns recommended in the owners manual for starting your motor for break-in. This is usually 2 ½ to 4 turns counter clockwise. If your not sure how many turns, try 4 turns out. We will then move the needle valve in till the motor will start and run.

Priming The Motor. Open the throttle wide open,(no power to glow plug) place a finger over the carburetor opening and turn the prop about 4 times. Once fuel has reached the needle valve inlet. This is known as priming the motor.

Starting Throttle Point. Close the throttle till you see the carburetor barrel about 1/16 to 1/8 inch open. Flip the prop over a few times to evenly distribute the fuel inside the motor.

Power-up Glow Plug. Attach a glow plug driver or clip to the motors glow plug. If using a clip with wires running to a battery, make sure the wires are clear of the prop. Use an electric starter if available or a chicken stick to flip the prop over smartly.

Starting Troubles. If the motor will not start, check to see if you glow driver has power. Take a spare plug and apply power to it. If it glows a bright orange then you have power. The glow plug in the motor may be bad. Check it in the same manner. If it has power then the motor may be flooded from priming. Use your starter or chicken stick to turn the motor over sharply with the glow plug still removed. Also remember to remove the brass glow plug ring or you may never see it again. This will send fuel shooting out of the glow plug opening very forcefully so keep others and yourself clear. You do not want to splash fuel in their or your eyes especially. Replace glow plug and ring and try to restart. Since the motor was flooded you shouldn’t need to reprime.

Initial Adjustments. When the motor starts you may need to advance the throttle with power still to the glow plug a few times to clear the motor of built up fuel from priming. If you advance the throttle and the motor sputters gurgles and dies, the mixture is to rich. Turn the high speed needle in a ¼ to ½ turn and restart till the motor will stay running when advancing slowly to full throttle. The motor will still hesitate and sputter, but this is exactly what we want. Remove power to the glow plug. If the motor sputters and dies. Turn the needle in as before and restart. Do this until the motor will run without power to the plug and where the motor can be opened to full throttle with out dieing.

First Half Hour. This is a very safe rich setting. The motor may sound a little rough because it’s running in a 4 cycle stage. This mean the motor is firing every 2 revolutions (or cycles) of the piston instead of every cycle. Let it run till the tank is almost dry and then close throttle to shut motor off. Refuel and do this again for the first 20 to 30minutes. Remember this is for a ringed motor.

Second Half Hour.After about 20 to 30 minutes. You can now lean the motor out till it reaches the 2 cycles stage. As you lean the motor, listen to the way the motor sounds. It will go from a rougher 4 cycle sound to a higher, cleaner pitch sound. This is when the motor is running in a 2 cycle stage. Stop here. Do not keep leaning the motor just yet. Allow the motor to run in this 2 cycle stage for about 30 to 40 seconds. Then back the needle out (richen) and allow it to 4 cycle again for about 30 to 40 seconds . This cools the motor. Repeat this step for another 20 to 30 minutes.

Congratulations! Your motor should now be broken in! You can now head over to setting up your engine for better performance.