Yamaha 4 outboard manual

Page Tilt Support Bar Basic components 1. Top cowling lock lever s EMU Tilt support bar The tilt support bar keeps the outboard motor in the tilted up position. EMU Top cowling lock lever s turn type To remove the engine top cowling, turn the lock lever s and lift off the cowling. When in- stalling the cowling, check to be sure it fits properly in the rubber seal.

Otherwise Yamaha dealer or boat manufacturer for the engine could be completely lost if it further information on determining the prop- accidentally falls off the transom.

For details, consult your Yamaha dealer. Page Preoperation Checks Check fuel line connections to be sure they Be sure the fuel tank is positioned on a se- cure, flat surface, and that the fuel line is not Page 22 Operation 1. Engine oil 1. Engine oil 2. Gasoline 2. Gasoline Replace the fuel tank cap and close tight- Replace the fuel can cap and close tight- Shake the fuel tank to mix the fuel thor- Shake the fuel can to mix the fuel thor- oughly.

Page Operating Engine Operation High oil ratio: Too much oil could cause fouled spark plugs, smoky exhaust, and heavy carbon deposits. NOTE: If using a permanently installed tank, pour the oil gradually as the gasoline is being added to the tank.

During engine operation place the tank hori- For the external fuel tank, loosen it on the zontally, otherwise fuel cannot be drawn from fuel tank cap by 2 or 3 turns. NOTE: The start-in-gear protection device prevents the engine from starting except when in neu- tral. Page Warming Up Engine Stop the engine and check whether the cooling water inlet on the low- er case or the cooling water pilot hole is blocked. Consult your Yamaha dealer if the problem cannot be located and cor- rected.

Use care to avoid being pinched when removing or installing the rod. Use caution when trying a trim position for the first time. Increase speed gradu- ally and watch for any signs of instability or control problems. Performance and econ- motor trim angle may have little effect on the omy are decreased because the hull of the trim of the boat when operating.

EMU Procedure for tilting up manual tilt models Place the gear shift lever in neutral if equipped and face the outboard motor forward. Page Cruising In Other Conditions Cruising in turbid water Yamaha strongly recommends that you use the optional chromium-plated water pump kit not available for some models if you use the outboard motor in turbid or muddy water con Page Transporting And Storing Outboard Motor The outboard motor should be trailered and It is advisable to have your outboard motor stored in the normal running position.

If there serviced by an authorized Yamaha dealer pri- is insufficient road clearance in this position, or to storage. However, you, the owner, with a Page Lubrication Except Oil Injection Models For information on spark iar with machine servicing, this work plug installation, see page For instructions, see other qualified mechanic.

Inspect the oil for the presence of water that indicates a leaky seal. Page Maintenance Chart When operating in salt water, turbid or muddy water, the engine should be flushed with clean water after each use. Initial Every Item Actions The condition of Page Checking Fuel System Improper repairs can make the outboard unsafe to operate. Check the fuel lines for leaks, crack, or mal- function.

If a problem is found, your Yamaha dealer or other qualified mechanic should re- pair it immediately. Spark plug gap 2. Page Checking Fuel Filter Yamaha dealer or other ter is found in the filter, replace it. For replace- qualified mechanic. Verify whether the idle speed is set to specification. For idle speed specifica- tions, see page Page Exhaust Leakage Maintenance EMU Exhaust leakage Start the engine and check that no exhaust leaks from the joints between the exhaust cover, cylinder head, and body cylinder.

EMU Water leakage Start the engine and check that no water leaks from the joints between the exhaust cover, cylinder head, and body cylinder. Page Removing The Propeller Severe injury could oc- cur if the outboard motor accidentally Apply Yamaha marine grease or a corro- falls. Work only outdoors in dealer. Inspect ground leads attached to external an- odes on equipped models.

Consult a Yamaha Empty the fuel tank into an approved con- dealer for inspection and replacement of inter- tainer. Page 46 Maintenance Page Trouble Recovery Yamaha outboard motors. Therefore Q. Has fuel pump malfunctioned? Have serviced by a Yamaha dealer. If your outboard motor requires repair, bring it to your Yamaha dealer.

Are spark plug s fouled or of incorrect Page 48 A. Return to normal operating position. Fill tank with clean, fresh fuel. Is carburetor clogged? Is fuel filter clogged? Clean or replace filter. Is fuel joint connection incorrect? Have ignition parts failed? Replace plate if groove s other than impeller sealing bead groove in plate are more than 0. Remove water pump base using flat screwdrivers to lightly pry up on base. With propeller shaft horizontal, pull carrier using tool shown to break seal with gear housing.

Take care not to lose cam follower or 3 metal balls in end of propeller shaft. Remove propeller shaft from bearing carrier. Lift reverse gear, thrust bearing and thrust washer from bearing carrier.

Replace thrust bearing and thrust washer if rusted or damaged. Replace reverse gear if gear teeth or clutch teeth on reverse gear are rounded or chipped. If reverse gear must be replaced, pinion gear and sliding clutch should be inspected or damage. If reverse gear radial bearing is rusted or does not roll freely, replace bearing.

If the bearing needs to be replaced remove it using Slide Hammer A1. If bearing is rusted or does not roll freely, replace bearing. Discard oil seals. Remove propeller shaft seals if not removed with bearing in Step 9 and bearing carrier O-ring. Apply constant pressure to cam follower in order to prevent it and internal components from ejecting out of the propeller shaft during removal of the cross pin from the clutch.

Remove components from propeller shaft. Replace cam follower if worn or pitted. Replace sliding clutch if jaws are rounded or chipped. Rounded jaws indicate one or more of the following:. Replace propeller shaft if any of the following exist:. Prop shaft trueness should be measured with a dial indicator with prop shaft on V-blocks. Hold drive shaft using Drive Shaft Holding Tool; remove and discard pinion nut.

Remove drive shaft, pinion gear, pinion bearing and forward gear. Replace pinion gear if it is chipped or worn. Replace pinion bearing and race if either are rusted, pitted or damaged; or if bearing does not roll freely. Replace forward gear if gear teeth or clutch teeth are chipped or worn. Replace forward gear needle bearing if it is rusted or does not roll freely. Use suitable tools screwdriver and awl to remove retaining ring.

Use a punch and hammer to remove bearing. Replace forward gear bearing and race if either are rusted, pitted or damaged, or if bearing does not roll freely.

Remove bearing from gear using Universal Puller Plate and mandrel. Replace drive shaft if splines are worn or twisted.