10
CONTROLS & OPERATION
Before operating the mower for the fi rst time, please review
and understand the entire manual including all Warnings and
Cautions.
Even if you have operated other mowers in the past please
take time to become familiar with how this mower works and
practice all operations to build up your skills.
BEFORE ANY OPERATION ALWAYS:
- Inspect the mower for any visible damage or broken parts
- Check the oil level in the engine
-
Make sure that when you release the upper control bar
that the blade will disengage and stop. If it does not stop
immediately do not use the lawn mower until the problem has
been corrected. Contact Ybravo.com for advice.
- Never operate the mower with obvious damage or
malfunction until the problems have been corrected.
WARNING
N
ever make any adjustments or repairs with the
engine running. Disconnect the spark plug wire,
and keep the wire away from the spark plug to
prevent accidental starting.
STARTING THE ENGINE
To start a cold engine it is important to use the “Choke”
position. To start a warm engine it is not necessary to use the
choke.
For best performance use the “Full Throttle” position for all
mowing. To verify that the engine is running at full throttle
please follow the steps outlined under the set up instructions
- Step 7 on Page 8 or 9.
A Ybravo.com dealer can typically also verify the correct full
throttle adjustment. The engine speed should be approximate-
ly 3600 RPM without the blade engaged (no load).
BLADE CONTROL - BBC
(Blade Brake Clutch)
It is a multi step process to engage the blade. Do not start the
engine and the blade on an uncut lawn. If the blade is blocked
by tall grass or debris it can damage the belt drive between the
engine and the blade during the engagement.
1. Start the engine and let it warm up for 10 to 30 seconds.
2. Set the throttle control to the “Full Throttle” position.
3. Push the lock (1) for the upper control bar to the side.
4. Push down on the upper control bar until it rests on the
handlebar (2). You will distinctly hear the blade operating -
making a fan like noise.
5. When the upper control bar is released the blade should
stop within 3 seconds.
Additional maintenance instructions are found on Page 14.
WARNING
NEVER insert a hand or any other object in the grass
discharge chute to verify that the blade has stopped.
If the blade continues to run (no change in the noise
or size of the grass bag) after releasing the upper
control bar it is an indication of a malfunction of the
BBC system.
If the blade did not stop during the BBC Function Test
procedure or if you are unsure - Immediately stop the
engine by using the throttle control on the left side of
the control panel. The BBC system will require a repair
before further use. Immediately contact Ybravo.com
for advice. Do not under any circumstances defeat the
function of the BBC system. This can cause serious
injury or death.
CHOKE
FULL THROTTLE
IDLE THROTTLE STOP
1
2
BBC Function Test - Before each use
A simple test to verify the BBC function is to install an empty
grass collection bag. The mulch plug should not be installed.
1. Start the engine.
2. Engage the blade per above procedure. Notice how the
noise changes and that the bag becomes “infl ated”.
3. Release the upper control bar. If the bag does not “defl ate”
immediately, it indicates that the blade is still engaged and
rotating.
4.
IF
the bag defl ated -
verify
that the blade has stopped
rotating by removing the grass bag and look at the stopped
blade through the grass discharge chute.
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