Yamaha · Yamaha two-stroke single (DT, AT, CT, YZ, IT, RT 1968-)

DT1 / DT2 / DT175 / DT250 / DT400 / AT / CT / RT

Library entry covers 1968-1990

22 factory 46 guideline

Published source

Yamaha DT125E / DT175E Owner's Manual (Yamaha Motor Co.), Periodic Maintenance and Lubrication Intervals pp.19-20

Factory owner's handbook. Covers 1977 DT125E / DT175E owner's manual; chart in km and mi.

Open the source

68 items for a 1970 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 oil injection (Autolube, Injectolube, Pilgrim pump...)
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

1970 Yamaha DT1 / DT2 / DT175 / DT250 / DT400 / AT / CT / RT

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

On the road: every 1,000 mi

2 items

Check road kit: plugs, points file, master link, tube patches, wire, tape

Pre-ride / on the road

Guideline
Walk-around: check nuts and bolts for vibration loosening

Pre-ride / on the road

Factory

Manual: Fittings and fasteners: tighten before each trip and/or. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 250, 500 and 1,000 mi

Every 250 mi

1 item

Clean drive chain thoroughly (remove and soak, re-lube)

Final drive

Factory

Manual: Drive chain: clean and lube. Factory: Periodic maintenance p.19, lubrication intervals p.20: tension and alignment checked every 1,000 mi (1,600 km)

Every 1,000 mi or 6 months

2 items

Check gearbox oil level

Primary and gearbox

Guideline
Adjust rear drum brake and rod / cable linkage

Brakes

Guideline

Every 1,000 mi

5 items

Check / bleed / adjust oil injection pump cable

Engine

Factory

Manual: Autolube pump: check, adjust, bleed air. Factory: Periodic maintenance p.19, lubrication intervals p.20: checked at 500 mi, first at 1,000 mi; dealer item
Clean / inspect air filter

Fuel and air

Factory

Manual: Air filter: clean, replace as required. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 250 and 1,000 mi
Clean fuel tap filter / sediment bowl

Fuel and air

Factory

Manual: Fuel petcock: clean, flush tank as required. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 250 and 1,000 mi
Check battery electrolyte, top up with distilled water

Ignition and electrics

Factory

Manual: Battery: top up, check specific gravity and breather pipe. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 250, 500 and 1,000 mi
Inspect tire tread, sidewalls and date codes

Wheels and tires

Factory

Manual: Wheels and tires: check pressure, wear, balance, runout. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 250, 500 and 1,000 mi

Every 2,000 mi or 12 months

1 item

Replace spark plugs (two-stroke)

Engine

Guideline

Every 2,000 mi

10 items

Inspect, clean and gap spark plugs

Engine

Factory

Manual: Spark plug: inspect, clean or replace as required. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 250, 500 and 1,000 mi
Clean carburetor float bowl(s), check float level and jets

Fuel and air

Factory

Manual: Carburetor: check operation, adjust as required. Factory: Periodic maintenance p.19, lubrication intervals p.20: checked at 500 mi, first at 2,000 mi
Clean and gap contact breaker points, oil cam felt

Ignition and electrics

Factory

Manual: Ignition timing: adjust, clean or replace points as required. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 500 mi, checked at 1,000 mi; point cam wick (DT125E) oiled at the same interval
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Factory

Manual: Clutch: check and adjust. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 500 and 1,000 mi
Change gearbox oil

Primary and gearbox

Factory

Manual: Transmission oil: replace (warm engine before draining). Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 500 and 1,000 mi; level checked every 1,000 mi
Grease and check center / side stand and springs

Rear suspension and frame

Factory

Manual: Brake pedal shaft and stand pivot: grease lightly. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 1,000 mi
Inspect rear shocks for leaks and damping

Rear suspension and frame

Factory

Manual: Suspension system: check, adjust, repair as required. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 500 and 2,000 mi
Adjust front drum brake

Brakes

Factory

Manual: Brake system (complete): check, adjust, repair as required. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 500 and 1,000 mi
Check wheel bearings for play

Wheels and tires

Factory

Manual: Wheel bearings: grease, do not over-pack. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 2,000 mi; checked every 1,000 mi
Lubricate control cables and lever pivots

Controls and cables

Factory

Manual: Control and meter cables: lubricate thoroughly; throttle grip and housing: grease lightly. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 1,000 and 2,000 mi

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
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
Check spoke tension and wheel true

Wheels and tires

Guideline

Every 4,000 mi or 12 months

2 items

Replace spark plugs

Engine

Guideline
Lubricate brake cam spindles, check linings and drums

Brakes

Guideline

Every 4,000 mi

5 items

Decarbonize exhaust ports, pipes and baffles

Engine

Factory

Manual: Cylinder head and exhaust pipe: decarbonize. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 2,000 mi; dealer item
Change fork oil

Front end

Factory

Manual: Front forks: drain completely and refill. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 2,000 mi; checked at 500 and every 1,000 mi
Repack / replace steering head bearings

Front end

Factory

Manual: Steering bearings: inspect thoroughly, pack moderately. Factory: Periodic maintenance p.19, lubrication intervals p.20: checked at 2,000 mi; dealer item
Grease swingarm pivot

Rear suspension and frame

Factory

Manual: Rear arm pivot shaft: grease fully. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 2,000 mi
Lubricate speedometer / tachometer cables, check drive

Controls and cables

Factory

Manual: Speedometer gear housing: inspect, pack moderately. Factory: Periodic maintenance p.19, lubrication intervals p.20: first at 2,000 mi

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

2 items

Check charging voltage and regulator / cut-out

Ignition and electrics

Guideline
Check swingarm bushes for play

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 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 2 years

1 item

Replace air filter element

Fuel and air

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 20,000 mi or 4 years

1 item

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 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

3 items

Inspect fuel tank for rust, sealer failure, leaks

Fuel and air

Guideline
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

2 items

Replace oil injection delivery lines

Engine

Guideline
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.