Kuryakyn 9420 HYPERCHARGER for YAMAHA - Manual (Page 4)

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4
STEP 16
Connect all hoses. You may need to refer to the Yamaha Road Star factory service manual.
• The 3/8” I.D. hose is your crankcase breather hose. Insert one end of the 3/8” barbed connector
into this hose and then plug it into the large rubber nipple on the bottom of the
rubber intake duct.
• Connect the float bowl vent hose from the carburetor to the plastic 90-degree
fitting you installed in STEP 8.
• Route the vacuum line connected to the “T” fitting installed in STEP 9 to the
vacuum nipple located at the bottom of the vacuum pod on the back of the
Hypercharger.
STEP 17 Reinstall fuel tank and seat.
STEP 18
Double check the tightness of all related fasteners, check for hose
clearance and check throttle for correct operation, making sure it returns
properly, before starting bike. The butterflies should be completely open when
the bike is not running, closed and fluttering when the bike is idling and will open
momentarily then close again if the throttle is blipped with the bike in neutral.
ATTENTION! It is the installer’s responsibility to ensure that all of the fasteners
(including pre-assembled) are tightened before operation of the
motorcycle. Küryakyn will not issue a warranty on components lost due to
improper installation. Periodic maintenance may be required.
ADDENDUM I
The jets included in this kit were selected based on test results with various combinations
of components that we felt would represent the majority of the customers purchasing this
kit. However, no two motorcycles are exactly alike. Depending on the individual case,
additional jets may need to be purchased from an outside source.
The following recommendations are intended as a starting point and
should work well in the majority of cases. Individual bikes may need
additional tuning to achieve maximum performance. If the exact
combination is not listed, choose the listing that most closely
resembles the configuration of the motorcycle. These baselines were
established at 700 feet above sea level.
SETTING THE PILOT MIXTURE SCREW
While the carburetor is removed for re-jetting, remove the pressed-in
plug covering the pilot mixture screw and as a starting point, set the PMS
two turns out from lightly bottomed. Once the bike is completely
reassembled, start it and allow the engine to reach normal operating
temperature. The engine should idle on its own without the enrichener.
Search for the highest idle speed by slowly turning the PMS inward and
outward; there will be a small range where idle speed is maximized. Once
the highest idle speed has been located, turn the PMS inward ever so
slowly until the idle begins to drop then back it out just enough to make
the idle speed pick back up. You have now located the ideal PMS setting.
ROAD STAR 1700 WITH HYPERCHARGER AND STOCK EXHAUST:
Main Jet 185—Needle 1158j-72W
(
clip in 4th groove)—Pilot Air Bleed 1.3—Pilot
Jet 37.5
ROAD STAR 1700 WITH HYPERCHARGER AND COBRA SLIP-ON MUFFLERS:
Main Jet 175—Needle 1158j-72W
(clip in 3rd groove)—Pilot Air Bleed 1.3—
Pilot Jet 37.5
ROAD STAR 1700 WITH HYPERCHARGER AND HARD KHROME STAGGERED
STRAIGHTS: Main Jet 182.5—Needle 1158j-72W
(clip in 2nd groove) Pilot Air
Bleed 1.3—Pilot Jet 37.5
ROAD STAR 1700 WITH HYPERCHARGER AND COBRA LOBOYS STAGGERED
DUALS: Main Jet 182.5—Needle 1158j-72W
(clip in 2nd groove) Pilot Air
Bleed 1.3—Pilot Jet 37.5
ROAD STAR 1600 (These items are in a separate, small poly bag inside the jet
kit) Main Jet 205—Needle: Add one .020” shim to raise needle—Pilot Air Bleed 1.5
Ride On!
HYPERCHARGER
INSTALLATION
PIC 8
PIC 9
FIG 1