Pro Twister Mods Breakin

This is a step by step method on how to break in your GO engine, for long lasting engine reliability and less stress on the motor during breakin.

These are the items needed for breakin, heat gun, a hair dryer is ok but it doesnt get as hot as needed a heat gun is prefered, alum foil, afterrun oil.

Let's get started, to be sure the needles are set correct, the HSN should be just below flush, the LSN should be 2.5 turns out from flush, this is the best starting point we have used.

Your GO engine comes with a extra shim, now is the time to install this, this will help with the break in, after about a gallon of fuel you will want to remove it, also when you have the head off, place a few drops of ARO on the top of the piston and work the piston up and down a few times so the cylinder is coated with it. Now you can place the head back on.

If you havnt done it already, use some sealer to seal the back plate to the case, we do this just as a saftey precaution, also the carb to the case if you want, i do. Now that the motor is sealed and ready to be fired, double check all your servo links and be sure they are secure, be sure you exaust springs are on and secure.

Place the alum foil on the head while it is in the car, you can use a rubberband to help hold it on tight.

When you have the motor running you will keep the foil on the head during the entire process, the temps may go high but leave it, the needle setting are still going to be rich.

IMPORTANT, when you have the motor running on the ground, you want the HSN set so the motor will stay over 210 degrees, you want the motor to have a rich bottom but still be able to move the car without struggeling, and it should reach RPM good, not race tune RPM but able to move the car easy. You won't need to mess with the LSN during the breakin much.

Let's fire it up, the first tank is just to help flush the motor, and see the settings are good, you may need to bump the idle up just a bit on the Radio trim or the motor to help maintain a good idle during breakin, i like to use the idle screw on the motor so when you apply brakes it won't shut off the motor.

One thing i see alot of people doing is over turning the needle settings just go a little at a time, don't turn the needles 3 to 4 ours and think it will get you where you want to be, small turns will get you to the tinning window you want.

Keep the heat gun on the motor during the entire first tank, if you have a hard time getting the motor to turn over, which you shouldn't if it is over 200 loosen the plug and it should fire, just tighten it after you get it going.

Always be sure the piston is at BDC at the end of each tank

Here we GO

Tank 1 Flush motor

Tanks 1 through 3= idle to 1/4 throttle
Tanks 4 through 6= idle to 1/2 throttle
Tanks 7 through 9= idle to 3/4 throttle
Tanks 10 through 12= idle to 100%

your break in is complete, it is recommended that you keep a conservitive race setting untill you get about 3/4 to a gallon of fuel through the motor.
Brian Carey
Pro Twister Mods
615-838-5373