8
BREAK IN
PROCEDURE
SOME THINGS TO REMEMBER DURING BREAK-IN
1.
Run with the body off. This will keep the engine cooler.
2.
Keep the air cleaner on at ALL times
3.
Run on a smooth, hard surface. An empty parking lot
is perfect.
4.
Use the same fuel that you will use for normal running.
5.
Resist the urge to accelerate and decelerate quickly.
6.
Break-in puts stress on the glow plug and can burn it out.
Make sure you have an extra plug or two on hand.
7.
Do NOT overheat the engine (see page 9). You can check the
head temperature by using one of the temperature gauges that
are readily available (DuraTrax Flashpoint
™
, DTXP3100).
TANK 1
Your fi rst tank of fuel should be running the Raze ST at a
very rich needle valve setting. This allows the fuel to carry as
much oil as possible into the engine to properly lubricate the
internal parts during the break-in.
1.
Open the high speed needle valve 4-1/2 turns from fully
closed (counterclockwise). This is factory set already,
but check it to make sure. When closing the high-speed
needle, close until you feel some resistance. DO NOT
overtighten or you will damage the engine.
2.
Fill the fuel tank and start the engine.
3.
Run the truck on a smooth surface with the body off.
4.
Run back and forth at medium speeds, slowly accelerating
and decelerating the truck.
5.
Run the truck until the tank is almost out of fuel. Do not
allow the tank to run out of fuel during break-in. This leans
out the engine and can cause overheating.
6.
Stop the engine and allow it to cool. This normally takes
around 10-15 minutes.
NOTE:
If your engine does not stay running consistently, increase
the idle speed by turning the idle stop screw clockwise.
TANK 2
Lean the high-speed needle 1/12 turn from “tank 1” setting.
Run the truck for the complete tank and then let cool.
TANK 3
Lean the high-speed needle another 1/12
turn from “tank 2” setting. Run the truck
for the complete tank and then let cool.
TANK 4
Lean the high-speed needle another 1/12 turn from “tank
3” setting. Run the truck for the complete tank and then let
cool. You should notice the engine running much better at
this point.
TANK 5
Lean the high-speed needle another 1/12 turn from “tank 4”
setting. Run the truck for the complete tank and then let cool.
The engine is now ready to be performanced tuned.
Important!
At this point, the engine will likely be running at a
faster idle speed than needed (This is typical after break-in).
Adjust the idle stop screw to lower the idle speed so that the
wheels do not, or just barely, rotate when you lift the truck off
the ground.
TUNING TIPS
After break-in, run the truck where you plan to do most of
your driving (grass, street, track, etc). Tune the high speed
needle so the engine makes good power without overheating.
Using a temperature gauge, tune the engine so that it will
consistently stay under 230° F. Keep in mind, RC engines
usually take a minute or two to warm up. It is common not to
reach full power right away. Never tune a cold engine!
If needed, tune the low speed needle so that the truck idles
and accelerates smoothly and consistently.
Note:
You may
sometimes experience “run-on” when running the truck.
“Run-on” is when the engine does not drop back down to idle
after the trigger on the transmitter is released. To correct this,
richen the low-speed needle using 1/8 turn increments until
the engine idles normally when the trigger is released.
ENGINE CARE
Never store your Raze ST with fuel in the tank. We recommend
that after the fi nal run of the day, you empty the fuel tank and
then run the engine at idle until all the fuel is out of the fuel lines
and engine. Remove the air fi lter and glow plug. Then place
two drops of Hobbico
®
After Run Engine Oil (HCAP3000) in the
carburetor and two into the cylinder to help prevent corrosion.
Run the Super Start a few times to circulate the oil.
10 WAYS TO ENSURE LONG LIFE FROM YOUR ENGINE
1.
Keep your engine and air fi lter clean. Dirt will act as
insulation on an engine. It will not be able to shed heat as
easily. Clean and re-oil the element often.
2.
Do not over-lean your engine.
3.
Do not run your engine with little or no load. Don’t throttle
up the engine to full throttle when the wheels are not in
contact with the ground.
4.
Do not overheat the engine (see page 9).
5.
Do not use a fuel with a low oil content. Make sure you use
a model car fuel from a reputable manufacturer, such as
O’Donnell Fuels.
6.
Avoid using old fuels in the engine.
7.
Do not scratch the piston or cylinder sleeve. Avoid jamming
something into the exhaust port when removing or re-
installing the clutch or fl ywheel. Use a special tool called
the Ultimate Flywheel Wrench (DTXR1105) to keep the
crankshaft from moving.
8.
Do not use silicone sealer on the engine joints. Silicone
sealer contains acetic acid, which is corrosive if it gets
inside your engine.
9.
Do not allow any water to get inside the engine. This sounds
easy, but temperature changes can cause condensation
inside the engine. This is a good reason to use an after-run
oil. Store your engine inside the house, not in a garage or
shed where there will be temperature extremes.
