ELECTRICAL AND IGNITION

2 D

TIMING/SYNCHRONIZING/ADJUSTING

90-831996R1 JUNE 1996 ELECTRICAL AND IGNITION 2D-–1 Table Of Contents Page Page Timing/Synchronizing/ Check WOT Position Adjusting...... 2D-1 with Not Running...... 2D-4 Specifications...... 2D-1 Check WOT Special Tools...... 2D-1 with Engine Running...... 2D-5 Checking for Top Dead Center (TDC). . . . 2D-1 Check WOT Ignition Timing with Engine Not Running...... 2D-5 Checking Timing (At Cranking Speed). . . 2D-1 Adjusting Idle Mixture...... 2D-6 Turn-Key Start Feature...... 2D-2 Check Oil Pump Adjustment...... 2D-7 Synchronizing to Ignition Timing for Turn-Key Start...... 2D-2 Setting Idle Timing...... 2D-3

2D-0 ELECTRICAL AND IGNITION 90-831996R1 JUNE 1996 4. Check if mark on aligns with mark on Timing/Synchronizing/ pointer. Adjusting Specifications MODEL 90/95/120 SPORT JET MAXIMUM TIMING @ 5000 RPM* 30° BTDC

@ CRANK SPEED 32° BTDC IDLE RPM 950 - 1100 RPM FULL THROTTLE RPM 4700 – 5300 NOTE: If mark and pointer do not align, the flywheel TYPE CHAMPION L76V key has been sheared. CHAMPION QL76V Checking Timing (At Cranking Speed) 90/95 HP 1 - 2 - 3 Timing Specifications FIRING ORDER 120 HP 1 - 3 - 2 - 4 HP At Cranking At Wide Open Speed Throttle WARNING 90/95/120 32_ 30_ Engine can start when turning flywheel to check timing. Remove all spark plugs from engine to 1. Remove spark plug leads from spark plugs, re- prevent engine from starting. move spark plugs. Special Tools 2. Attach spark tester (Special Tool No. 91-850439) to engine. Attach tester leads to corresponding Description Part Number spark plug leads. Service *91-59339 *91-99379 Spark Gap Tester 91-850439 *May be obtained locally. Checking for Top Dead Center (TDC) 1. Remove spark plug wires and spark plugs. 2. Install timing tool (Special Tool No. 91-58222A1). 3. Turn flywheel in a clockwise direction until TDC is reached as shown on the dial indicator. 55117

3. Move towershaft to position.

90-831996R1 JUNE 1996 ELECTRICAL AND IGNITION 2D-1 4. Connect timing light (Special Tool No.91-99379) IMPORTANT: The Turn Key Start feature is depen- to the No. 1 spark plug lead. dent on closed throttle shutters. If the throttle shutters are even slightly cracked open the Turn IMPORTANT: The advance characteristics of this Key Start will be disabled. are such that the ignition timing will retard itself slightly at wide-open-throttle. COMPLETE THIS PROCEDURE IN SEQUENCE Thus, setting maximum timing at 32_ BTDC at 1. Disconnect throttle link at towershaft end. cranking speed should result in retardation to 30_ BTDC at 5300 RPM. Therefore, it is recommended that to be assured of maximum performance all timing adjustments made at cranking speed should be verified with the engine running. 5. Crank motor and observe timing marks. As Needed 6. Adjust timing. 7. Loosen locknut. 8. Turn timing rod to adjust timing. 9. Tighten locknut on timing rod.

a

a b a - Throttle Link a - Locknut b - Timing Rod 10. Remove test equipment and install spark plugs and . NOTE: If possible, test the motor and check the timing under actual operating conditions.

Turn-Key Start Feature The Sport Jet utilizes an automatic enrichner to start a cold engine. Advancing the throttle will disable the auto enrichner. Synchronizing Carburetors to Ignition Timing for Turn-Key Start IMPORTANT: An engine idle speed of 950 - 1100 RPM is necessary to provide the engine with ade- quate cooling water.

2D-2 ELECTRICAL AND IGNITION 90-831996R1 JUNE 1996 2. Synchronize throttle movement on carburetors. 4. Pivot throttle cam forward so it just contacts the This is done by : roller.

b b

b b - Mark 5. Inspect position of mark on cam in relation to roller. NOTE: Mark on cam must align with the center of the (90/95 HP Shown) roller, without moving it.

b - Tie Bar Screw(s) NOTE: Throttle cam adjustments are critical to low a. Rotate throttle cam away from roller on bottom speed engine timing. If the adjustment is off (too early . or too late), the engine will not run properly at low b. Loosen tie bar screw(s). speed.

c. Check that the carburetor shutters are closed. 6. If throttle cam pick up point requires adjustment: d. Tighten tie-bar screw(s). a. Loosen nut until screw can just be turned. You e. This adjustment is made with the throttle link should feel slight friction between screw and disconnected from the towershaft (Step 1). throttle cam.

IF REQUIRED: 3. Adjust idle stop screw to specified dimensions fol- lowing: a b

c

a - Cam b - Nut c - Eccentric Roller

b. Turn eccentric roller counterclockwise to cor- rect adjustment as described in Step 3. a c. Hold position of roller with screwdriver. d. Tighten nut. 90 HP Shown NOTE: When this procedure is done ensure that there 90/95 HP: Set dimension (a) to 1/8 in. is clearance between the throttle cam and roller, so that the throttle shutters remain closed. 120 HP: Set dimension (a) to 1/4 in. Setting Idle Timing 1. Connect the link rod to the tower shaft. 2. Start the engine.

90-831996R1 JUNE 1996 ELECTRICAL AND IGNITION 2D-3 3. Check engine timing at idle. Idle timing is 8_ to 10_ Check WOT Throttle Position with BTDC. Engine Not Running 4. If adjustments are needed to obtain the 8_ to 10_ 1. Advance the tower shaft to WOT and check shut- BTDC specifications, do the following: ter position from horizontal, " 5_. a. Turn the tower shaft screw in to increase timing, turn screw out to decrease timing.

c

a - Throttle Shutter b - Line On Throttle Shaft c - Tower Shaft Screw Corresponds To Shutter Position IF REQUIRED: b. Disconnect the link arm to adjust the clearance of the cam to roller (.005 - .015 in.). 2. Adjust the WOT stop screw to obtain a horizontal shutter position, " 5_. c. Re-connect the link arm. d. Re-start the engine and check the idle timing.

a

a a - e. Adjust carburetor idle mixture screws for best operation. Idle RPM will be between 950-1100. a - WOT Stop Screw

2D-4 ELECTRICAL AND IGNITION 90-831996R1 JUNE 1996 Check WOT Ignition Timing with Check WOT Ignition Timing with Engine Running Engine Not Running 1. With engine running at WOT, check the timing (28_ 1. Remove spark plug leads from spark plugs. - 30_).

a a - Timing Mark 2. If adjustments are needed do the following: a. Turn off the engine. b. Loosen locknut. c. Turn timing rod:

(1.) In to increase timing 2. Remove spark plugs. (2.) Out to decrease timing 3. Attach spark tester (Special Tool No. 91-850439) 3. Tighten locknut. to engine. 4. Re-check timing.

a

b 55117 a - Locknut 4. Connect spark plug leads to spark tester. b - Timing Rod 5. Connect timing light (Special Tool No. 91-99378) to the number 1 spark plug lead.

90-831996R1 JUNE 1996 ELECTRICAL AND IGNITION 2D-5 6. Hold towershaft in the wide open throttle (W.O.T.) 5. Starting with top carburetor, turn each of the idle position. mixture screws clockwise 1/8 turn at a time, allow- ing 10 seconds between each turn, until motor be- gins to pop from lean fuel/air setting.

1/8 Turn (Wait 10 Seconds)

a a - Tower Shaft 1/8 Turn 7. Crank motor and observe timing marks. (Until Engine Pops) IMPORTANT: To attain 30 degrees timing while the engine is actually running, set timing at cranking speed to 32 degrees. Adjusting Idle Mixture IMPORTANT: Idle mixture screw adjustments should be made with motor in water. Idle cannot be properly set using a flushette or . 3/16 Turn 1. Turn idle mixture screws clockwise until lightly 6. Turn each idle mixture screw counterclockwise seated. (richer) 3/16 turn. This should be very close to the optimum setting. CAUTION 7. Advance throttle to W.O.T. to “clear out” the en- Do not force idle screws. Tip damage could result. gine. 2. Turn idle mixture screws out (counterclockwise) 8. Return throttle to idle speed and allow engine to 1-1/2 turn. idle for at least one minute. 3. Start motor and allow to warm up to operating tem- 9. Quickly advance the throttle to W.O.T.. If the en- perature. gine hesitates because of a rich fuel mixture, turn the idle mixture screws 1/6 turn clockwise to “lean 4. Move throttle control to the lowest reliable setting. out” the carburetors and repeat step 7-9 until the IMPORTANT: Motor must idle for minimum of one engine accelerates without hesitation. minute to allow fuel recirculation system to begin functioning. IMPORTANT: The carburetors must be adjusted together. As you turn one idle mixture screw, turn the remaining carburetor idle mixture screws the same amount before proceeding.

2D-6 ELECTRICAL AND IGNITION 90-831996R1 JUNE 1996 Check Oil Pump Adjustment 1. Move towershaft to the Wide Open Throttle posi- tion. Inspect oil pump alignment mark with the oil pump lever. Adjust oil pump link rod to align with the last mark.

a - Oil Pump Lever b - Alignment Mark (At Wide Open Throttle) 2. Adjust oil pump link rod as required.

90-831996R1 JUNE 1996 ELECTRICAL AND IGNITION 2D-7