
03-45
SECTION 03 - ENGINE PREPARATION
1. Water supply hose of regulator valve
2. Regulated water to injection fitting at tuned pipe head
3. Water injected into the muffler
Procedure for Hard Jetting the Exhaust
System
1. Remove the water flow regulator valve and re-
place the unit with a fitting that will thread into
the muffler in its place. The fitting must have at
least a 3 millimeter orifice through it and be
threaded to accept a Mikuni main jet. The fitting
must also accept a 1/4 in inside diameter hose.
2. At the exhaust tuned head pipe there is a 1/4 in
fitting already in use that was used to accept
the regulated water supply from the now dis-
carded water flow regulator valve. Remove the
hose from the fitting at the head pipe and
thread the fitting to accept a Mikuni main jet.
3. The engine is equipped with a 1/2 in water inlet
hose coming from the jet jump. Between the
jet pump and the engine there is a 1/4 in out-
side diameter T-fitting and hose currently in-
stalled. The fitting and hose was used to supply
water to the now discarded water regulator. At-
tach a 1/4 in T-fitting to the hose in place of the
water flow regulator valve. Attach 2 hoses of 1/4
in hoses to the T-fitting, run 1 hose to the new fit-
ting on the muffler which replaces the water flow
regulator valve and 1 hose to the fitting on the
tuned head pipe.
4. Start the hard jetting procedure by installing a
no. 200 Mikuni main jet in the fitting on the
muffler and a no. 150 Mikuni main jet in the fit-
ting on the exhaust tuned head pipe. After an
initial test ride of no more than 3 minutes, stop
and check the exhaust hoses for excessive
temperature. If you believe the temperatures
to be too high install a larger jet in both areas.
This is highly unlikely because the initial jet siz-
es stated should be more than sufficient.
5. After verifying that the exhaust hose tempera-
ture is not excessive you can start testing the
watercraft with smaller or larger jets in order to
attain the performance desired.
-
CAUTION
When “Hard Jetting” an exhaust system
small jets are used to regulate water flow.
These jets are very prone to clogging by
sand or debris. The jets must be continually
checked for blockage or system damage will
occur.
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Содержание Bombardier
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