Cable inspection and lubrication steps:
• Remove the two screws that secure throttle housing to handlebar.
• Hold cable end high and apply several drops of lubricant to cable.
• Coat metal surface of disassembled throttle twist grip with suitable all-purpose grease to minimize friction.
•Check for damage to cable insulation. Replace any corroded or obstructed cables.
ENGINE OIL
At 5°C(40°F) or Higher: Yamalube 4-Cycle Oil or SAE 20W40 Type SE Motor Oil
At15°C(60°F) or Lower: SAE 10W30 Type SE Motor Oil
LOWER CRANKCASE
CAMSHAFT, CAM CHAIN, AND CAM SPROCKET
Camshaft
1. Measure:
• Large cam lobe length 1
• Small cam lobe length 2
Steering Head Inspection
1. Place the motorcycle on its centerstand, then elevate the front wheel.
2. Check the steering assembly bearings. Grasp the bottom of the forks and gently rock the fork assembly back and forth. Adjust if any looseness can be detected.
Adjustment
IGNITION TIMING CHECK
1. Check: • Ignition timing
Ignition timing check steps:
• Remove the cover.
• Connect Timing Light (90890-03109) (1) to No. 1 cylinder spark plug lead.
PISTON AND CAM CHAIN GUIDE
Mark each piston so it can be reinstalled in the appropriate cylinder.
1. Remove:
• Piston pin clips 1
• Piston pins 2
OIL PUMP AND OIL PAN
1 Chain cover
2 Oil pump sprocket
3 Oil pump drive sprocket
4 Oil pump cover
5 Inner rotor
6 Spring
7 Relief valve
8 Shaft
9 Dowel pin
10 Outer rotor
11 Dowel pin
12 O-ring
REMOVAL
Middle Drive Gear
NOTE:
Middle drive gear and its shims can be removed without separating the engine.
1. Remove the clutch cover. Refer to "ENGINE DISASSEMBLY."
CRANKSHAFT AND CONNECTING ROD
Crankshaft Runout
1. Place both ends of crankshaft on V-blocks.
2. Rotate Crankshaft
3. Measure the crankshaft runout at main journal bearings. Use a Dial Gauge (90890-03097).
