Timing/Synhronizing/ Adjusting (3 Cylinder Models) 2. Timing Light* 91-99379 Speifitions 65 JET, 75 nd 90 Models Full Throttle RPM Rnge Model 75 Model 65 JET/90 4750-5250 5000-5500 Idle RPM (in FORWARD Ger) 675 25 RPM Mximum Timing 75 65JET/90 75 65 JET/90 18 B.T.D.C. 22 B.T.D.C. Idle Timing 2 A.T.D.C. 6 B.T.D.C. Sprk Plug Firing Order 1994/1995 Models 1996/97/98 Models NGK BUHW-2 1-3-2 1-2-3 3. Sprk Gp Tool 91-63998A1 * My e otined lolly. Speil Tools 1. Servie Thometer* 91-854008A1 90-830234R3 DECEMBER 1997 ELECTRICAL - 2C-1
CARBURETOR SYNCHRONIZATION 1. Disonnet remote fuel line from engine. 2. Connet remote ontrol eletril hrness to engine wiring hrness. 3. Remove throttle le rrel from rrel retiner. 4. Remove sound ir ox over to verify throttle shutters re losed. 5. Loosen srew (1) from throttle m follower. 6. Loosen 2 synhronizing srews (2). - Idle Stop Srew - Roller d - Throttle Cm e - Rised Mrk f - Lok Nut - Cm Follower Adjustment Srew - Synhronizing Srews 7. Hold throttle rm so tht idle stop srew is ginst stop. 8. Ple roller of m follower ginst throttle m nd djust idle stop srew to lign rised mrk of throttle m with enter of m follower roller. Tighten loknut. 9. Holding throttle rm t idle position, djust m follower, so tht lerne of 0.005 in. - 0.020 in. (0.13-0.51 mm) exists etween roller of m follower nd throttle m. Tighten set srew seuring m follower. 0.005 0.020 (0.13 0.51mm) 54169 - Roller - Throttle Cm - Cm Follower Adjustment Srew 2C-2 - ELECTRICAL 90-830234R3 DECEMBER 1997
TIMING ADJUSTMENTS CAUTION Engine is timed while rnking engine with strter motor. To prevent engine from strting when eing rnked, ll sprk plugs must e removed, exept no. 1 (top) ylinder plug. IDLE TIMING ADJUSTMENT 1. Connet timing light to no. 1 (top) sprk plug. MAXIMUM TIMING 1. Hold ontrol rm so tht mximum sprk dvne srew is ginst stop. 2. Crnk engine with strter motor nd djust mximum sprk dvne srew to lign the speified BTDC timing mrk on flywheel with timing pointer (due to the dvne hrteristi of this ignition system, this rnking speed djustment will utomtilly e redued y 2 t n engine speed of 3000 RPM). Tighten loknut. WARNING Before rnking engine, keep ler of propeller s it my rotte. 2. Shift engine to Neutrl. IMPORTANT: To urtely time engine t rnking speed, fully hrged ttery must e used. 3. Holding throttle rm t idle position, rnk engine with strter motor nd djust idle timing srew to lign 5 BTDC timing mrk of flywheel with timing pointer. Tighten loknut. 2-8 BTDC 0 2 8 - Control Arm - Mximum Sprk Advne Srew - Loknut 53419 MAXIMUM THROTTLE 1. Hold throttle rm ginst full throttle stop srew. Adjust full throttle stop srew to llow throttle shutters to open fully, then turn stop srew in (lokwise) n dditionl 1/2 turn, to prevent throttle lever of enter ruretor from ting s stop. Tighten loknut. 20442 - Idle Timing Srew - Full Throttle Stop Srew - Loknut 53420 90-830234R3 DECEMBER 1997 ELECTRICAL - 2C-3
INITIAL STARTING ADJUSTMENTS 2-8 BTDC 0 2 8 After servie or replement of ruretor, turn low speed mixture srew djustment in (lokwise) until it sets lightly, then k off (eh ruretor) to speifitions (65JET/75/90 1 turn on #1 r; 1 1-1/2 turns on #2 nd #3 rs). This will permit engine strt-up. LOW SPEED MIXTURE ADJUSTMENTS 1. Strt engine nd llow to wrm up (run for severl minutes). Throttle k to idle for out one minute to llow RPM to stilize. 2. With engine running t idle speed (in wter) in Forwrd ger (prop on), turn low speed mixture srew, IN (lokwise) until engine strts to og down nd misfire. Bk out 1/4 turn or more. 3. Chek for too len mixture on elertion. 4. DO NOT djust lener thn neessry to ttin resonle smooth idling. When in dout, sty on the slightly rih side of the djustment. IDLE ADJUSTMENT 1. With engine in wter, onnet eletril hrness nd fuel line to engine. Strt engine nd llow to wrm up. 2. Shift into Forwrd ger nd djust ruretor low speed mixture srews properly (refer to Cruretor setion). 3. Holding throttle rm t idle position, djust idle timing srew to ttin n engine idle RPM of 650-700 RPM in Forwrd ger. Turn off engine. - Idle Timing Srew 53426 2C-4 - ELECTRICAL 90-830234R3 DECEMBER 1997
Throttle Cle Instlltion 1. With end of throttle le onneted to throttle lever, hold throttle lever ginst idle stop. Adjust throttle le rrel to slip into rrel retiner on le nhor rket with very light prelod of throttle lever ginst idle stop. Lok rrel in ple. IMPORTANT: Exessive prelod on throttle le will use diffiulty when shifting from forwrd to neutrl. (Redjust throttle le rrel, if neessry.) 2. Chek prelod on throttle le y pling thin piee of pper etween idle stop srew nd idle stop. Prelod is orret when pper n e removed without tering ut hs some drg on it. (Redjust throttle le rrel, if neessry.) CARBURETOR/OIL PUMP SYNCHRONIZATION 1. While holding throttle rm t idle position, djust length of link rod so tht stmped mrk of oil pump ody ligns with stmped mrk of oil pump lever. Timing/Synhronizing/ Adjusting (4 Cylinder Models) Speifitions Models 80 JET/100/115/125 Full Throttle RPM Rnge 4750-5250 Idle RPM (in FORWARD Ger) 675 25 Mximum Timing 1994/1995 Models 1996/97/98 Models 22 B.T.D.C. 23 B.T.D.C 25 B.T.D.C Idle Timing 4 A.T.D.C. - 2 B.T.D.C. Sprk Plug Type NGK BP8H-N-10 0.040 IN. (1.0MM) Firing Order 1-3-2-4 Speil Tools Prt No. Desription *91-59339 Servie Thometer *91-99379 Timing Light 91-63998A1 Sprk Gp Tool - Link Rod - Stmped Mrk of Oil Pump Body - Stmped Mrk of Oil Pump Lever 2. Reinstll engine owling. CARBURETOR SYNCHRONIZATION 1. Remove sound ox over. 2. Loosen m follower djustment srew. 3. Loosen 3 synhronizing srews. 4. Look into throts of ruretors nd verify ll throttle shutters re ompletely losed. 5. Apply light down pressure on ruretor synhronizing shft nd tighten 3 synhronizing srews from top to ottom. 6. Rehek throttle shutters nd mke ny neessry djustment. 7. Hold throttle rm so tht idle stop srew is ginst stop. 90-830234R3 DECEMBER 1997 ELECTRICAL - 2C-5