MotoService Log
Bultaco Metralla / Matador / Sherpa / Pursang / Alpina
Example photo: Montesita, CC BY-SA 4.0, Wikimedia Commons
Bultaco · European two-stroke single (DKW, Jawa, CZ, MZ, Puch, Bultaco, Montesa, Ossa)

Metralla / Matador / Sherpa / Pursang / Alpina

Library entry covers 1958-1983

23 factory 47 guideline

Published source

Bultaco Sherpa T 74 / Sherpa T 125 Manual de instrucciones (CEMOTO, 2nd ed., art. 184.30-027/E)

Factory owner's handbook. Covers Sherpa T 74 (Mod. 184), Sherpa T 125 (Mod. 185).

Open the source

70 items for a 1958 model, grouped by interval the way a factory chart is laid out.

How this bike is built (what the schedule is based on)
Engine cycle
Two-stroke
Engine lubrication
Two-stroke premix (oil in fuel)
Oil filtration
None (no filter)
Valve gear
None (two-stroke porting)
Ignition
Magneto (incl. magdyno, flywheel magneto)
Charging
Alternator / stator with rectifier
Battery
Wet cell (flooded lead-acid, needs topping up)
Fuel system
Single carburetor
Cooling
Air / oil cooled
Primary drive
Gear or chain inside engine, shares engine oil
Gearbox oil
Separate gearbox oil
Clutch control
Hand lever, cable
Final drive
Chain
Front suspension
Telescopic fork
Rear suspension
Swingarm, twin shocks
Front brake
Drum (or band / stirrup)
Rear brake
Drum (or band / belt rim)
Wheels
Spoked, tubed
Sidecar
No sidecar
Maintenance schedule

1958 Bultaco Metralla / Matador / Sherpa / Pursang / Alpina

On the road: every 150 mi

1 item
  • Check two-stroke oil tank / carry premix oil
    Pre-ride / on the road
    Guideline

    Running a two-stroke out of oil seizes it. Injection bikes: check the tank. Premix: carry oil and a measure.

On the road: every 300 mi

2 items
  • Check lights, horn, brake light switches
    Pre-ride / on the road
    Guideline
  • Check tire pressures
    Pre-ride / on the road
    Guideline

On the road: every 311 mi

1 item
  • Lubricate drive chain
    Pre-ride / on the road
    Factory

    Manual: Secondary chain lubrication. Factory: Lubricacion section pp.30-33; penetrating SAE 20 oil

On the road: every 621 mi

1 item
  • Check chain slack and rear wheel alignment
    Pre-ride / on the road
    Factory

    Manual: Tension and grease secondary chain. Factory: Esquema general de mantenimiento p.36

On the road: every 1,000 mi

1 item
  • Check road kit: plugs, points file, master link, tube patches, wire, tape
    Pre-ride / on the road
    Guideline

On the road: every 3,107 mi

1 item
  • Walk-around: check nuts and bolts for vibration loosening
    Pre-ride / on the road
    Factory

    Manual: General tightening of nuts and bolts. Factory: Esquema general de mantenimiento p.36

Every 621 mi

4 items
  • Inspect, clean and gap spark plugs
    Engine
    Factory

    Manual: Clean and gap spark plug. Factory: Esquema general de mantenimiento p.36; first 500 km: points, chain, bolts

  • Clean / inspect air filter
    Fuel and air
    Factory

    Manual: Clean carburetor air filter. Factory: Esquema general de mantenimiento p.36

  • Clean carburetor fuel inlet filter
    Fuel and air
    Factory

    Factory: Esquema general de mantenimiento p.36

  • Lubricate control cables and lever pivots
    Controls and cables
    Factory

    Manual: Clutch, front brake and throttle cables lubrication. Factory: Lubricacion section pp.30-33

Every 1,000 mi or 1 month

1 item
  • Check battery electrolyte, top up with distilled water
    Ignition and electrics
    Guideline

    Wet-cell batteries on old machines need regular topping up, more in hot weather.

Every 1,000 mi or 6 months

5 items
  • Grease swingarm pivot
    Rear suspension and frame
    Guideline
  • Adjust front drum brake
    Brakes
    Guideline
  • Adjust rear drum brake and rod / cable linkage
    Brakes
    Guideline
  • Check spoke tension and wheel true
    Wheels and tires
    Guideline
  • Inspect tire tread, sidewalls and date codes
    Wheels and tires
    Guideline

Every 1,500 mi or 6 months

1 item
  • Clean drive chain thoroughly (remove and soak, re-lube)
    Final drive
    Guideline

    Non O-ring chains on old machines: remove, clean, soak in hot chain grease or lube, refit with the master link clip closed end leading.

Every 1,500 mi or 12 months

1 item
  • Adjust clutch free play, lubricate cable and lever pivot
    Primary and gearbox
    Guideline

Every 1,553 mi

2 items
  • Clean fuel tap filter / sediment bowl
    Fuel and air
    Factory

    Manual: Clean fuel tap filter. Factory: Esquema general de mantenimiento p.36

  • Clean and gap contact breaker points, oil cam felt
    Ignition and electrics
    Factory

    Manual: Clean and gap contact breaker points. Factory: Esquema general de mantenimiento p.36; grease cam felt when adjusting

Every 1,864 mi

2 items
  • Throttle twistgrip greasing
    Engine
    Factory

    Factory: Lubricacion section pp.30-33

  • Check gearbox oil level
    Primary and gearbox
    Factory

    Manual: Check primary/clutch and gearbox oil level. Factory: Lubricacion section pp.30-33; repeated at 5,000 km

Every 2,000 mi or 12 months

1 item
  • Replace spark plugs (two-stroke)
    Engine
    Guideline

Every 3,000 mi or 12 months

11 items
  • Check engine mounting bolts and plates
    Engine
    Guideline
  • Check throttle cable(s) free play and return
    Fuel and air
    Guideline
  • Check / set ignition timing
    Ignition and electrics
    Guideline
  • Adjust clutch pushrod / clutch adjuster
    Primary and gearbox
    Guideline
  • Check chain guard, chain oiler (if fitted), rear chain case
    Final drive
    Guideline
  • Inspect chain and sprockets for wear (measure stretch)
    Final drive
    Guideline
  • Check steering damper (friction or hydraulic)
    Front end
    Guideline
  • Inspect fork seals, stanchions and fork boots
    Front end
    Guideline
  • Check footrests, pegs, rear brake and gear lever pivots
    Rear suspension and frame
    Guideline
  • Grease and check center / side stand and springs
    Rear suspension and frame
    Guideline
  • Check wheel bearings for play
    Wheels and tires
    Guideline

Every 3,107 mi

8 items
  • Check crankshaft oil seals both sides
    Engine
    Factory

    Factory: Esquema general de mantenimiento p.36

  • Decarbonize exhaust ports, pipes and baffles
    Engine
    Factory

    Manual: Decarbonize engine. Factory: Esquema general de mantenimiento p.36

  • Change gearbox oil
    Primary and gearbox
    Factory

    Manual: Change gearbox oil, engine warm. Factory: Esquema general de mantenimiento p.36

  • Change primary chaincase oil
    Primary and gearbox
    Factory

    Manual: Change clutch (primary) oil. Factory: Esquema general de mantenimiento p.36

  • Change fork oil
    Front end
    Factory

    Manual: Renew front suspension damper oil. Factory: Lubricacion section pp.30-33; 100 cc per leg

  • Lubricate brake cam spindles, check linings and drums
    Brakes
    Factory

    Manual: Clean brake drums, check linings. Factory: Esquema general de mantenimiento p.36; brake cams greased, lubrication section

  • Repack / replace wheel bearings
    Wheels and tires
    Factory

    Manual: Wheel bearings: clean and grease. Factory: Lubricacion section pp.30-33

  • Lubricate speedometer / tachometer cables, check drive
    Controls and cables
    Factory

    Manual: Speedometer cable lubrication. Factory: Lubricacion section pp.30-33

Every 4,000 mi or 12 months

1 item
  • Replace spark plugs
    Engine
    Guideline

Every 5,000 mi or 2 years

1 item
  • Check cylinder head bolt torque
    Engine
    Guideline

    Air-cooled iron and alloy engines can lose head bolt tension; follow your manual's sequence and whether it is done hot or cold.

Every 6,000 mi or 12 months

4 items
  • Clean carburetor float bowl(s), check float level and jets
    Fuel and air
    Guideline

    Ethanol fuel varnishes old carbs quickly in storage.

  • Check charging voltage and regulator / cut-out
    Ignition and electrics
    Guideline
  • Check swingarm bushes for play
    Rear suspension and frame
    Guideline
  • Inspect rear shocks for leaks and damping
    Rear suspension and frame
    Guideline

Every 6,000 mi or 2 years

2 items
  • Lubricate and check automatic advance unit
    Ignition and electrics
    Guideline
  • Magneto: clean slip ring and pickup brush, check HT lead
    Ignition and electrics
    Guideline

Every 6,214 mi

4 items
  • Inspect fuel tank for rust, sealer failure, leaks
    Fuel and air
    Factory

    Manual: Clean fuel tank with gas. Factory: Esquema general de mantenimiento p.36

  • Check steering head bearing adjustment
    Front end
    Factory

    Manual: Check steering adjustment. Factory: Esquema general de mantenimiento p.36

  • Repack / replace steering head bearings
    Front end
    Factory

    Manual: Steering bearings lubrication. Factory: Lubricacion section pp.30-33; Bultaco service recommended

  • Replace all control cables
    Controls and cables
    Factory

    Factory: Esquema general de mantenimiento p.36

Every 10,000 mi or 2 years

1 item
  • Compression test (or leak-down)
    Engine
    Guideline

Every 10,000 mi

1 item
  • Replace chain and sprockets (wear based)
    Final drive
    Guideline

Every 12,000 mi or 3 years

1 item
  • Replace points and condenser
    Ignition and electrics
    Guideline

Every 15,000 mi or 5 years

1 item
  • Inspect clutch plates and springs
    Primary and gearbox
    Guideline

Every 15,000 mi

1 item
  • Replace brake linings / skim drums (wear based)
    Brakes
    Guideline

Every 25,000 mi or 6 years

1 item
  • Replace swingarm bushes / bearings
    Rear suspension and frame
    Guideline

Every 25,000 mi or 10 years

1 item
  • Magneto overhaul / re-magnetize, replace capacitor
    Ignition and electrics
    Guideline

    Weak spark when hot is the classic symptom. Old capacitors fail with age, not miles.

Every 30,000 mi or 6 years

1 item
  • Rebuild forks: seals, bushes, springs
    Front end
    Guideline

Every 6 months

1 item
  • Clean battery terminals, check charge and strap
    Ignition and electrics
    Guideline

Every 12 months

1 item
  • Check speedometer / odometer against a known distance
    Controls and cables
    Guideline

    Old speedos drift with tire size and drive wear. Use phone GPS over a measured 10 miles / km.

Every 2 years

2 items
  • Inspect wiring, bullet connectors and ground points
    Ignition and electrics
    Guideline
  • Inspect frame, welds and lugs for cracks
    Rear suspension and frame
    Guideline

Every 4 years

1 item
  • Replace fuel lines
    Fuel and air
    Guideline

    Old rubber and modern ethanol fuel do not mix well.

Every 6 years

2 items
  • Replace inner tubes and rim tape with tires
    Wheels and tires
    Guideline
  • Replace tires on age (regardless of tread)
    Wheels and tires
    Guideline

Guideline lines: Intervals here are general guidelines for the machine's era and layout, compiled for this app. They are not factory manual figures. Check your workshop manual, and edit any interval in the bike's Schedule tab.

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Add the bike in the app and this chart loads itself, ready to log against and edit.

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