SB, Engine Misfi Ring Noise Repair Instruction, 150BT, 150BF, 350BT

B1200089

English 1 (3) SB, Engine misﬁ ring noise repair instruction, 150BT, 150BF, 350BT, 350BF, 2012-10

Product model Procuct serial number 150BT(965102302 / 965102303 / 965102304 / From #00000000 to #21299999 965102305 / 965877601) 150BF(965102401 / 965102402) 350BT(965877502) 350BF(965877701)

Problem: Some individual new engines of the above stated models under certain conditions can experience abnormal engine misﬁ ring noise described as “knocking sound”. A preliminary analysis suggests the failure is primarily caused by mismatch of ignition timing and carburetor setting to the individual engine.

IMPORTANT: This repair is effective for only blower which has used JASO FD Certiﬁ ed 2 Stroke Engine Oil. Any product which used lower grade’s of oil is not supported and not warranted. (Please refer to Owner’s/Operator’s Manual for details.)

Repair: Repair Kit Part Number: 581 24 07-01. Repair kit includes one ignition coil, one #45 Main Jet, one carburetor gasket and this Service Bulletin # 1. Replace Ignition Coil and Main Jet (from #44 to #45) 2. Submit Warranty with entering “” in “Work Performed” ﬁ eld. Labor is 8 units.

WARNING! Make sure that the engine has stopped and is cool before performing any service to the blower. Contact with rotating blower impeller fan or hot mufﬂ er may result in a personal injury. Make sure to wear proper clothes and gloves. Read Owner’s / Operator’s manual carefully before start repairing.

Required tools: Crosshead Screwdriver, T-27 Wrench, Torque Wrench, Loctite 242 (blue) medium strength, Digital Engine Tachometer and Air Gap (Filler) Gage (0.016 Inches-P/N: 510 96 17-01)

Repair Procedure 1. Replace IGNITION COIL (New coil is marked C03 or CDC, old coil is marked CDA or CDB or D01 or D02) 1-1. Empty FUEL TANK. 1-2. Remove a FUEL and RETURN LINE from Fig.1 CARBURETOR. 1-3. Remove FUEL TANK by removing three (3) T-27 SCREWs at the bottom of frame (Fig.1). 1-4. Remove ENGINE COVER by removing four (4) T-27 SCREWs (Fig.2). 1-5. Remove COIL COVER by removing one (1) T-27 BOLT (Fig.3). Fig.2 Fig.3 B1200089

English 2 (3)

1-6. Remove IGNITION COIL by removing two (2) T-27 BOLTs (Fig.4). 1-7. Set new IGNITION COIL, using two (2) T-27 BOLTS with Loctite 242 (blue) with ﬁ nger tight (Fig.4) . Adjust Air Gap. Air Gap:0.016 Inches Tighten the BOLTS. Tightening Torque: 22-34 inch-lbs. 1-8. Install PLUG CAP to SPARK PLUG. Clamp high tension cord. 1-9. Install one (1) T-27 COIL COVER BOLT Fig.4 with Loctite 242 (blue) (Fig.3) . Tightening Torque: 9-13 inch-lbs. 1-10. Install four (4) T-27 ENGINE COVER SCREWs (Fig.2). Tightening Torque: 40-47 inch-lbs.

2 Replace MAIN JET 2-1. Remove AIR CLEANER COVER by loosening two (2) TAB SCREWs by hand (Fig.5). Fig.5 Fig.6 2-2. Remove AIR CLEANER ELEMENT (Fig.6) and THROTTLE CABLE. 2-3. Remove CARBURETOR and AIR CLEANER BODY by removing two (2) T-27 BOLTs (Fig.7). Discard old ‘carburetor to carb-block’ gasket. 2-4. Clean debris or dirt from CARBURETOR Fig.7 by using solvent and blow dry with compressed air. 2-5. Remove four (4) crosshead screws from carburetor in crisscross fashion as shown in (Fig. 8) Keep all screws remaining with carburetor pump body to be used in the same locations. (Fig.9). 2-6. Remove pump body with fuel pump (Fig.10) diaphragm from carburetor body (Fig.9). 2-7. Remove #44 MAIN JET and O-RING using ﬁ nger (Fig.10). Fig.8 2-8. Remove O-ring from #44 MAIN JET (Fig.11) and install the O-RING to #45 MAIN JET (Fig.12). 2-9. Install #45 MAIN JET and O-RING to carburetor body using ﬁ nger until MAIN JET is seated in the carburetor body (Fig.9). 2-10. Assemble PUMP BODY by secure four (4) Fig.9 crosshead SCREWs in crisscross fashion as shown in (Fig.8). Tightening torque: 6.5- 7.5 inch-lbs B1200089

English 3 (3)

2-11. Install CARBURETOR and AIR CLEANER BODY with new ‘carburetor to carb-block’ gasket by secure two (2) T-27 SCREWs (Fig.7). Tightening torque: 27-39 inch-lbs 2-12. Install AIR CLEANER ELEMENT (Fig.6) and AIR CLEANER COVER (Fig.5). Fig.10 Secure two (2) SCREWs on AIR CLEANER COVER by hand (Fig.5). 2-13. Install three (3) T-27 FUEL TANK SCREWs (Fig.1). Tightening torque: 27-34 inch-lbs Connect FUEL and RETURN LINEs to CARBURETOR. Connect THROTTLE CABLE to CARBURETOR. Fig.11 3. Adjust Idling Speed 3-1. Start and run ENGINE for three and a half (3.5) minutes alternating RPM between, Wide Open Throttle (WOT) for one (1) minute and Idle for ten (10) seconds. 3-2. Adjust the engine idling speed with turning idle speed adjustment screw to be from 2,000 to 2,400 rpm (Fig. 13). Fig.12 Fig.13 4. Submit Warranty Enter in “Work Performed” ﬁ eld. Labor is 8 units.