90-830234R3 DECEMBER 1997 ELECTRICAL - 2C-5
NOTE: On this type of engine, idle RPM is adjusted
exclusively with ignition timing.
Throttle Cable Installation
1. With end of throttle cable connected to throttle le-
ver, hold throttle lever against idle stop. Adjust
throttle cable barrel to slip into barrel retainer on
cable anchor bracket with a very light preload of
throttle lever against idle stop. Lock barrel in
place.
IMPORTANT: Excessive preload on throttle cable
will cause difficulty when shifting from forward
to neutral. (Readjust throttle cable barrel, if nec-
essary.)
2. Check preload on throttle cable by placing a thin
piece of paper between idle stop screw and idle
stop. Preload is correct when paper can be re-
moved without tearing but has some drag on it.
(Readjust throttle cable barrel, if necessary.)
CARBURETOR/OIL PUMP SYNCHRONIZATION
1. While holding throttle arm at idle position, adjust
length of link rod so that stamped mark of oil
pump body aligns with stamped mark of oil pump
lever.
a
b
c
a - Link Rod
b - Stamped Mark of Oil Pump Body
c - Stamped Mark of Oil Pump Lever
2. Reinstall engine cowling.
Timing/Synchronizing/
Adjusting (4 Cylinder
Models)
Specifications
Models 80 JET/100/115/125
Full Throttle RPM Range 4750 - 5250
Idle RPM (in FORWARD Gear) 675 ± 25
Maximum Timing
1994/1995 Models
@ 3000 RPM
@ Cranking
Speed
20 B.T.D.C.
22 B.T.D.C.
1996/97/98 Models
@ 3000 RPM
@ Cranking
Speed
23° B.T.D.C
25° B.T.D.C
Idle Timing
4A.T.D.C. -
2 B.T.D.C.
Spark Plug Type NGK BP8H-N-10
0.040 IN. (1.0MM)
Firing Order 1-3-2-4
Special Tools
Part No. Description
*91-59339 Service Tachometer
*91-99379 Timing Light
91-63998A1 Spark Gap Tool
CARBURETOR SYNCHRONIZATION
1. Remove sound box cover.
2. Loosen cam follower adjustment screw.
3. Loosen 3 synchronizing screws.
4. Look into throats of carburetors and verify all
throttle shutters are completely closed.
5. Apply light down pressure on carburetor synchro-
nizing shaft and tighten 3 synchronizing screws
from top to bottom.
6. Recheck throttle shutters and make any neces-
sary adjustment.
7. Hold throttle arm so that idle stop screw is against
stop.
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