Manual: Boomkicker K0750
Recommended Installation Tools:
Phillips Screwdriver; Fine Tooth Hacksaw; Center
Punch; Rule; Variable Speed Reversible Drill
and Blue Locktite.
1. Setup Boom Height: Sliding
goosenecks should be positioned for sailing.
Securing a stop under the gooseneck relocates
the position for rigging. Use the main halyard
to support the boom above its highest operating
position, or a desired height when moored or
docked. At this time, check that the Model K0750
is correct. The min. length is 31" (79cm)
pin to pin and the max. weight it can support
is approximately 21 lbs. (9.5kg) measured at
the outboard end of the boom with the main sail
2. Position Boomkicker: The
Boomkicker works by flexing upward and when
straight, it is at the top of its travel. Install
the Boomkicker with the screw head side of rod
clamps facing up to flex upward away from the
vang. With the boom height set, position the
Boomkicker with fittings alongside the vang
triangle to see how it fits. Position is not
critical so long as it does not interfere with
the vang. It's recommended that both the vang
and the Boomkicker make an angle of between
30o and 45o with the boom. Mark the location
for the mast fitting.
3. Install Mast Fitting: The
mast fitting comes with a luff grove slide to
avoid drilling the mast. Different diameters
and flat slides are available by exchange, or
at the web site or by phone. See part list.
If usable, after disassembly from the fitting,
the slide can often be inserted at the mast
opening for the sail and dropped or lowered
with a string. If the mast is out of the boat,
the slide may be inserted from the base of the
mast. Reassemble the mast fitting at the desired
location and tighten the screws. If the slide
is unusable, the bracket may be screwed directly
to the mast. Extra long screws are included
if needed to pass through the groove. Use the
#25 drill and the 10-24 tap provided, with the
mast fitting bracket as a guide. A variable
speed, reversible drill makes tapping easy.
Go slow. Locktite is recommended on threads.
4. Shorten if Necessary: If
the Boomkicker is too long, we recommend shortening
the rods at the mast end so any cut ends are
less visible. Loosen the rod clamp with the
provided hex-key and slide the extension up
the rods until there is a good fit. The bottom
half of the clamp fittings for each extension
have embossed stops to prevent slipping. Do
not shorten total length more than 5" (13cm).
Cut off extra rod length equally from both rods
with a fine tooth hacksaw. Before tightening
the clamps, check the rod ends are against the
embossed stops and the clamps/extensions are
not twisted relative to each other.
5. Install Boom Fitting: Make
sure the rod clamps at both ends are tight.
Then attach the Boomkicker to the mast fitting,
and the slide and track at the boom end. The
angle on the track goes forward, the stop in
aft. There are 3 standard choices for the stop
with the initial position in the middle for
later adjustment if needed. If necessary more
stop positions can be drilled using the inscribed
line along the side of the track for the 3/16"
diameter pin. With the Boomkicker in position
and slid back against the stop pin, and with
the track centered under the boom, mark one
hole. Then center punch, drill and tap. Attach
the track, recheck position, then drill and
tap the remaining holes using the track as a
guide. Use Locktite on threads. Hint: Once installed,
to attach the Boomkicker, it's usually easier
to slide the Boomkicker into the boom track
first, then attach it to the mast fitting, rather
then attaching to the mast first.
6. Check Return Force: After
installation, check return force by pushing
down on the end of the boom. The amount of support
desired is a personal preference. For reference,
with the sail flaked, using about 10 to 12 lbs.(4.5
to 5.4 kgs) to pull the aft end of the boom
down seems like a good balance between boom
support versus tension required to pull on the
vang. More support may be desired with a bimini
or if crew use the boom for support with the
sail down. Less support may be desired if the
mainsail is not stored on the boom or the Boomkicker
is used to just lift the boom in light air for
sail shape. If less or more force is needed,
optional spring rods are available either as
exchange, or ordered on the web or by phone.
The purpose of the Boomkicker is to support
the boom so the boom topping lift can be eliminated
along with the chafe, windage, hangups and adjustments.
If needed in unique circumstances, such as motoring
in waves with the mainsail down, the main halyard
can be attached to the aft end of the boom and
tightened for further support.
WARRANTY: The following is
made in lieu of all warranties, expressed or
implied. Seller's and manufacturer only obligation
shall be to replace or repair such parts of
the product proved to be defective for a period
of five years. User shall determine the suitability
of the product for its intended use and user
assumes all risk and liability whatsoever in
For additional information or support, contact
Mauri Pro Sailing
Technical Team, your Boomkicker specialist.