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Senke · Two-stroke single, premix, chain drive

SK125

Library entry covers 2008-2021

21 factory 57 guideline

Published source

Senke SK125-22 User Manual, maintenance chart (ManualsLib viewer p.31)

Factory source. Covers Senke SK125-22 user manual (English; names the SK125-22 variant; no year printed in the pages read); fit to the whole 2008-2021 row not confirmed.

78 items for a 2014 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: Disc, hydraulic
Rear brake: Drum (or band / belt rim)
Wheels: Spoked, tubed
Sidecar: No sidecar

Maintenance schedule

2014 Senke SK125

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

3 items

Check lights, horn, brake light switches

Pre-ride / on the road

Guideline
Check tire pressures

Pre-ride / on the road

Guideline
Lubricate drive chain

Pre-ride / on the road

Guideline

Lube warm, ideally at the end of the riding day so it soaks in overnight. Sooner after rain.

On the road: every 600 mi

1 item

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline

Every 621 mi

2 items

Engine oil (inspect or replace)

Engine

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): every 1,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Drive chain (wash and lubricate)

Final drive

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): every 1,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.

Every 1,000 mi or 6 months

2 items

Adjust rear drum brake and rod / cable linkage

Brakes

Guideline
Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 1,553 mi

13 items

Body bolts and nuts (tighten)

Engine

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000, 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Cylinder head nuts and exhaust pipe bolts (tighten)

Engine

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000, 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Valve clearance (inspect)

Engine

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000, 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Fuel hose (inspect)

Fuel and air

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000, 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Battery (inspect)

Ignition and electrics

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Clutch (inspect)

Primary and gearbox

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000, 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Camshaft drive chain tensioner (inspect)

Final drive

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000, 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Drive chain (inspect)

Final drive

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000, 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Front fork and rear shock absorber (inspect)

Front end

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Steering (inspect)

Front end

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Brake hose (inspect)

Brakes

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000 and 2,500 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Brakes (inspect)

Brakes

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000, 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Tires (inspect)

Wheels and tires

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): marked at 1,000, 2,500 and 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.

Every 1,864 mi

2 items

Spark plug (inspect at 1,000 km; clean)

Engine

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): every 3,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Air cleaner (inspect at 1,000 km; clean)

Fuel and air

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): every 3,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.

Every 2,000 mi or 12 months

1 item

Replace spark plugs (two-stroke)

Engine

Guideline

Every 3,000 mi or 12 months

13 items

Check throttle cable(s) free play and return

Fuel and air

Guideline
Clean fuel tap filter / sediment bowl

Fuel and air

Guideline
Check / set ignition timing

Ignition and electrics

Guideline
Clean and gap contact breaker points, oil cam felt

Ignition and electrics

Guideline
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.
Inspect chain and sprockets for wear (measure stretch)

Final drive

Guideline
Check steering head bearing adjustment

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 brake pads and discs

Brakes

Guideline
Check spoke tension and wheel true

Wheels and tires

Guideline
Check wheel bearings for play

Wheels and tires

Guideline

Every 3,000 mi or 2 years

1 item

Decarbonize exhaust ports, pipes and baffles

Engine

Guideline

Two-strokes coke up the exhaust port and muffler baffles; power falls off gradually.

Every 3,728 mi

1 item

Fuel strainer cup (clean at 2,500 km; replace)

Fuel and air

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): replace at 6,000 km. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.

Every 4,000 mi or 12 months

3 items

Inspect, clean and gap spark plugs

Engine

Guideline
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Guideline
Lubricate brake cam spindles, check linings and drums

Brakes

Guideline

Every 6,000 mi or 12 months

7 items

Clean / inspect air filter

Fuel and air

Guideline

Mesh or oiled foam: clean and re-oil. Paper: blow out or replace. Some very early machines have no filter at all.
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
Lubricate control cables and lever pivots

Controls and cables

Guideline
Lubricate speedometer / tachometer cables, check drive

Controls and cables

Guideline

A dry speedo cable whips the needle and eventually kills the instrument.

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 10,000 mi or 2 years

2 items

Compression test (or leak-down)

Engine

Guideline
Change gearbox oil

Primary and gearbox

Guideline

Every 12,000 mi or 2 years

2 items

Replace air filter element

Fuel and air

Guideline
Grease swingarm pivot

Rear suspension and frame

Guideline

Every 12,000 mi or 3 years

1 item

Replace points and condenser

Ignition and electrics

Guideline

Every 15,000 mi or 3 years

1 item

Change fork oil

Front end

Guideline

Some early telescopic forks are grease filled or use very small oil quantities. Check your manual.

Every 15,000 mi

1 item

Replace brake linings / skim drums (wear based)

Brakes

Guideline

Every 16,000 mi or 4 years

1 item

Replace spark plugs

Engine

Guideline

Every 18,000 mi

1 item

Replace chain and sprockets (wear based)

Final drive

Guideline

Every 20,000 mi or 4 years

2 items

Repack / replace steering head bearings

Front end

Guideline

Many old machines use loose balls in cups and cones. Taper roller conversions are common.
Repack / replace wheel bearings

Wheels and tires

Guideline

Cup-and-cone and taper roller hubs need periodic repacking and adjustment.

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 2 years

4 items

Inspect wiring, bullet connectors and ground points

Ignition and electrics

Guideline
Inspect frame, welds and lugs for cracks

Rear suspension and frame

Guideline
Brake fluid (replace)

Brakes

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): every 2 years. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Replace brake fluid

Brakes

Guideline

Every 4 years

5 items

Fuel hose (replace)

Fuel and air

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): every four years. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Replace fuel lines

Fuel and air

Guideline

Old rubber and modern ethanol fuel do not mix well.
Brake hose (replace)

Brakes

Factory

Factory: Maintenance chart (manual p.28, ManualsLib viewer p.31): every 4 years. Columns as printed: 1,000 km (5 months), 2,500 km (20 months), 6,000 km (40 months); the chart does not state whether these columns repeat, so the column items are entered at the 2,500 km spacing. Codes: I inspect; C clean; R replace; T tighten. Items marked with a star are for a dealer.
Inspect brake hoses; replace old rubber

Brakes

Guideline
Rebuild calipers and master cylinders (seals)

Brakes

Guideline

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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