Page 21 - Arrow Shark X-60 Owner Manual

Starting X-60

Note: Before starting your engine, make sure that it is securely mounted in your boat with appropriate fuel
and exhaust systems. Read through all the following instructions before starting. If your radio is installed and
your throttle servo linked to the engine, ensure that the carburetor controls operate as explained in the “Carb
Settings” section. If the engine is connected to your flex shaft drive and propeller, check that they are
properly aligned and that due care is taken to keep everything well clear of the prop. Remember that the prop
is very sharp, and also that the engine and exhaust will get quite hot when running. Do not run the engine for
more than a minute without a supply of cooling water, and never run the engine at more than low revs with
the boat out of the water.

The X-60 comes with a Pro-Mod -39X racing carburetor which does not have a primer bulb, choke or return
gas line like the more common WT644 or WT711 carbies that are usually fitted to stock Zenoah or CY
engines. The M-39X carb gives ultimate performance but does require a different starting procedure. Having
prepared your engine and boat in the usual way (with full regard to all safety aspects), and having filled your
fuel tank, follow these steps for easy starting:

* We recommend to start one cylinder first, so,leave the other cylinder without spark plug installed in order
to reduce the compression for easier starting with pull starter.
* Manually choke the engine by blocking the carb intake venturi with your thumb or finger and slowly pull
the starter rope a few times. The M-39X venturi is much larger than other carbies, so you may need to wear a
glove for your thumb or finger to fully seal the venturi for effective choking of the engine.
* Check that fuel is being sucked along the gas line up to the carb; continue slowly pulling the starter rope
until the gas line is clear or bubbles and you can feel fuel wetting your thumb or finger.
* Remove your thumb or finger from the carb and open the throttle a bit less than half way.
* Slowly pull the starter rope one more time to check the engine is not flooded (see below).
* Smartly pull the starter rope in the usual way until the engine starts.
* Bring the throttle back to a steady idle - DO NOT allow the engine to over-rev as this can cause damage.

If too much fuel is sucked into the engine as you choke it, the engine will be flooded and will not start. It
may be harder to pull over on the starter as the excess fuel increases compression. If this happens:
1. Remove the spark plug and carefully wipe dry the electrodes with a clean rag before setting the plug safely
aside.
2. Hold the clean rag just above the plug hole and pull the starter rope smartly a few times to clear the excess
fuel.
3. Re-install the spark plug and open the throttle a big less than half way.
4. Slowly pull the starter rope to check that compression is back to normal.
5. Smartly pull the starter rope in the usual way until the engine starts.
6. Bring the throttle back to a steady idle.

For “hot re-starts” you may not need to choke the engine. Check that the fuel line is full of gas without any
bubbles and smartly pull the starter rope. If the engine doesn’t start after a few pulls, then manually choke
the engine as above and slowly pull the starter rope until you can feel fuel wetting your thumb or finger
before removing it from the carb venturi. Slowly pull the starter one more time to check the engine is clear,
and then pull smartly until the engine starts.

After the first cylinder is started, let it run for 30 seconds to warm up the engine, then, stop the engine by
click on the built-in kill switch on the engine, and install the spark plug into second cylinder and pull the
starter cord to start the both cylinder at once.

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