Tank 6
STOP!
Clean your air filter before you proceed.
Refer to the instructions on page 13. During the
sixth tank of fuel, the engine can be tuned for general performance use. Proceed to the next
section in this manual for instruction on tuning the engine.
Winter Break-in Tips
During the break-in process, the piston and sleeve wear into each other to form a precise fit. The
engine needs to heat up to a temperature of at least 200 to 215 degrees to allow the piston and
sleeve to achieve this fit properly. A precise fit between these two components is critical for
proper compression and optimum performance. If the engine runs too cold during break-in, the
piston and sleeve will not expand to their appropriate sizes for break-in. This can lead to
premature wear of these components. This wear may not become apparent until winter
has passed and the engine is operated under warmer running conditions.
• Warm the engine to approximately room temperature by removing all fuel and storing the
vehicle inside at room temperature until just before starting the engine. An extremely cold
engine can become difficult to start.
• After the engine is running, it is important to keep the temperature of the engine to at least 200 to
215 degrees during break-in. In weather below 45 degrees, the TRX 2.5R Racing Engine will tend to
run at lower temperatures between 160 to 180 degrees (when tuned at proper break-in mixture
settings). This is too cool for break-in.
Do not lean the engine to increase engine temperature!
This will also decrease lubrication and cause your piston/sleeve to wear prematurely.
TRX 2.5R • 21
BREAKING-IN THE TRX 2.5R
Tank
1
2
3
4
5
Throttle
1/4
1/2
1/2
Full
Full
Time
2 Seconds
2 Seconds
3 Seconds
3 Seconds
5 Seconds
Cool
15 Minutes
15 Minutes
-
-
-
Body
Off
On
On
On
On
Notes
Apply throttle gradually.
Apply throttle gradually.
Reduce idle speed if necessary.
Gradually accelerate over 3 second count.
Accelerate over 3 second count,
hold for 2 seconds.
