Yamaha LB50 Maintenance Schedule

The "Periodic Maintenance / Lubrication Intervals" schedule is taken directly from a 1977 edition Yamaha LB50PE factory service manual. Before starting any work, always consult the manual for your scooter's model & year and be sure you know what you're doing.
 

LB50 Maintenance Intervals
Item Remarks Initial break-in
250 mi
(400 km)		 Initial break-in
500 mi
(800 km)
 Initial break-in
1,000 mi
(1,600 km)
 Initial break-in
2,000 mi
(3,200 km)
 Thereafter every
1,000 mi
(1,600 km)
 Thereafter every
2,000 mi
(3,200 km)
Ignition Timing* Check and clean contact breaker points. Adjust ingnition timing. Replace points when necessary.  
X
Check
X
  
X
Spark Plug Inspect/Clean or replace as required
NGK B-7HS, 0.020" - 0.024" gap
X
X
X
X
  
X
Decarbonize engine* Includes exhaust pipe and head    
X
    
X
Fuel petcock Clean/flush as needed  
X
X
  
X
  
Air filter Check for clogging. Clean and dampen with SAE 10W40 type SE motor oil or foam air filter oil  
X
X
  
X
  
Carburetor* Check operation. Adjust / repair as required.    
Check
X
  
X
Brake system* Inspect and adjust free play, and replace shoes if necessary
Front EBC501, DP9109
Rear EBC501, EBC519
X
X
X
  
X
  
Clutch Check / adjust as required
X
X
X
  
X
  
Autolube pump* Check and adjust minimum pump stroke    
Check
X
  
X
Drive chain Check tension and alignment Check tension every 300 mi (500 km)
Wheels and Tires Front 14 psi, Rear 22 psi
Front 4.00 x 8, Rear 4.00 x 8		  
X
X
  
X
  
Fittings and Fasteners Check and tighten as needed  
X
X
  
X
  
Battery Check fluid level and top with distilled water
6N4-2A-5		  
X
X
  
X
  
*Items for your Yamaha dealer to service.

LB50 Lubrication Intervals
Item Remarks Type Initial break-in
250 mi
(400 km)		 Initial break-in
500 mi
(800 km)
 Initial break-in
1,000 mi
(1,600 km)
 Initial break-in
2,000 mi
(3,200 km)
 Thereafter every
1,000 mi
(1,600 km)
 Thereafter every
2,000 mi
(3,200 km)
Transmission oil Warm up engine before draining. Yamaha 4 cycle oil or SAE 10W40 type SE motor oil  
X
X
  
X
  
Drive chain Check tension and alignment Yamaha chain and cable lube or SAE 10W30 motor oil Lube every 300 mi (500 km)
Control and meter cables Inspect and apply chain lube thoroughly. Yamaha chain and cable lube or SAE 10W30 motor oil  
X
X
X
    
Throttle grip housing* Light application Lithium soap based grease
 
 
 
X
X
 
Brake and change pedal shafts Light application Yamaha chain and cable lube or SAE 10W30 motor oil
 
 
X
 
X
 
Side stand pivot shaft Light application Yamaha chain and cable lube or SAE 10W30 motor oil
 
 
X
 
X
 
Front fork Drain completely and fill to specification Yamaha fork oil or equivalent    
Check
X
Check
X
Steering ball races* Moderately repack Medium weight wheel bearing grease      
Check
  
X
Wheel bearings* Moderately repack Medium weight wheel bearing grease      
X
  
X
Point cam lubrication* Apply very lightly Lightweight machine oil    
X
X
X
  
*Items for your Yamaha dealer to service.