Yamaha YX600 (1984-1992) [17/200] Troubleshooting 0 19

Содержание

Troubleshooting 3 Carburetors not synchronized Adjust them with a vacuum gauge set or manometer Chapter 1 4 Engine oil viscosity too high Using a heavier oil than that recommended in Chapter 1 can damage the oil pump or lubrication system and cause drag on the engine 5 Brakes dragging Usually caused by debris which has entered the brake piston sealing boot disc brakes weak springs drum brakes or trom a warped disc or bent axle Repair as necessary Chapter 6 Poor running or no power at high speed 14 Firing incorrect 1 Air filter restricted Clean or replace filter Chapter 1 2 Spark plug fouled defective or worn out See Chapter 1 for spark plug maintenance 3 Spark plug cap or secondary HT wiring defective See Chap ters 1 and 4 for details of the ignition system 4 Spark plug cap not in good contact See Chapter 4 5 Incorrect spark plug Wrong type heat range or cap configu ration Check and install correct plugs listed in Chapter 1 A cold plug or one with a recessed firing electrode will not operate at low speeds without fouling 6 Igniter defective See Chapter 4 7 Ignition coil s defective See Chapter 4 15 Fuel air mixture incorrect 1 Main jet clogged Dirt water or other contaminants can clog the main jets Clean the fuel tap filter the float bowl area and the jets and carburetor orifices Chapter 3 2 Main jet wrong size The standard jetting is for sea level atmospheric pressure and oxygen content 3 Throttle shaft tc carburetor body clearance excessive Refer to Chapter 3 for inspection and part replacement procedures 4 Air bleed holes clogged Remove and overhaul carburetors Chapter 3 5 Air cleaner clogged poorly seated or missing 6 Air cleaner to carburetor boot poorly sealed Look for cracks holes or loose clamps and replace or repair defective parts 7 Fuel level too high or too low Adjust the float s Chapter 3 8 Fuel tank air vent obstructed Make sure the air vent passage in the filler cap is open 9 Carburetor intake manifolds loose Check for cracks breaks tears or loose clamps or bolts Repair or replace the rubber boots Chapter 2 10 Fuel tap clogged Remove the tap and clean it and the filter Chapter 1 11 Fuel line clogged Pull the fuel line loose and carefully blow through it 16 Compression low 1 Spark plug loose Remove the plug and inspect the threads Reinstall and tighten Io the specified torque Chapter 1 2 Cylinder head not sufficiently tightened down If the cylinder head is suspected of being loose then there s a chance that the gasket and head are damaged if the problem has persisted for any length of time The head nuts should be tightened to the proper torque in the correct sequence Chapter 2 3 Improper valve clearance This means that the valve is not closing completely and compression pressure is leaking past the valve Check and adjust the valve clearances Chapter 1 4 Cylinder and or piston worn Excessive wear will cause 0 19 compression pressure to leak past the rings This is usually accompanied by worn rings as well A top end overhaul is necessary Chapter 2 5 Piston rings worn weak broken or sticking Broken or sticking piston rings usually indicate a lubrication or carburetion problem that causes excess carbon deposits or seizures to form on the pistons and rings Top end overhaul is necessary Chapter 2 6 Piston ring to groove clearance excessive This is caused by excessive wear of the piston ring lands Piston replacement is necessary Chapter 2 7 Cylinder head gasket damaged If the head is allowed to become loose or if excessive carbon build up on the piston crown and combustion chamber causes extremely high compression the head gasket may leak Retorquing the head is not always sufficient to restore the seal so gasket replacement is necessary Chapter 2 8 Cylinder head warped This is caused by overheating or improperly tightened head bolts Machine shop resurfacing or head replacement is necessary Chapter 2 9 Valve spring broken or weak Caused by component failure or wear the spring s must be replaced Chapter 2 10 Valve not seating properly This is caused by a bent valve from over revving or improper valve adjustment burned valve or seat improper carburetion or an accumulation of carbon deposits on the seat from carburetion or lubrication problems The valves must be cleaned and or replaced and the seats serviced if possible Chapter 2 17 Knocking or pinging 1 Carbon build up in combustion chamber Use of a fuel additive that will dissolve the adhesive bonding the carbon particles to the crown and chamber is the easiest way to remove the build up Otherwise the cylinder head will have to be removed and decarbonized Chapter 2 2 Incorrect or poor quality fuel Old or improper grades of fuel can cause detonation This causes the piston to rattle thus the knocking or pinging sound Drain old fuel and always use the recommended fuel grade 3 Spark plug heat range incorrect Uncontrolled detonation indicates the plug heat range is too hot The plug ir effect becomes a glow plug raising cylinder temperatures Install the proper heat range plug Chapter 1 4 Improper alr fuel mixture This will cause the cylinder to run hot which leads to detonation Clogged jets or an air leak can cause this imbalance See Chapter 3 18 Miscellaneous causes 1 Throttle valve doesn t open fully Adjust the cable slack Chap ter 1 2 Clutch slipping May be caused by loose or worn clutch components Refer to Chapter 2 for clutch overhaul procedures 3 Timing not advancing 4 Engine oil viscosity too high Using a heavier oil than the one recommended in Chapter 1 can damage the oil pump or lubrication system and cause drag on the engine 5 Brakes dragging Usually caused by debris which has entered the brake piston sealing boot or from a warped disc or bent axle Repair as necessary Overheating 19 Engine overheats 1 Engine oil level low Check and add oil Chapter 1

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