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Yamaha · Two-stroke single, premix, chain drive

YZ 85

Library entry covers 2002-2025

40 factory 50 guideline

Published source

Yamaha YZ85(A) Owner's Manual, Periodic maintenance and lubrication chart pp.7-2 to 7-6 (ManualsLib 580302 pages 46-50)

Factory owner's handbook. Covers Yamaha YZ85(A) owner's manual, print 2010.06; other years not compared.

90 items for a 2006 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: Electronic (CDI / transistor / ECU)
Charging: Alternator / stator with rectifier
Battery: Wet cell (flooded lead-acid, needs topping up)
Fuel system: Single carburetor
Cooling: Liquid 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, single shock / cantilever
Front brake: Disc, hydraulic
Rear brake: Disc, hydraulic
Wheels: Cast / alloy, tubeless
Sidecar: No sidecar

Maintenance schedule

2006 Yamaha YZ 85

On the road: every 200 km

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 500 km

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 800 km

1 item

Check coolant level

Pre-ride / on the road

Guideline

On the road: every 1,000 km

1 item

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline

Every 1,600 km or 6 months

1 item

Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 3,000 km or 12 months

1 item

Replace spark plugs (two-stroke)

Engine

Guideline

Every 5,000 km or 12 months

10 items

Check throttle cable(s) free play and return

Fuel and air

Guideline
Clean fuel tap filter / sediment bowl

Fuel and air

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 wheel bearings for play

Wheels and tires

Guideline

Every 5,000 km 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 6,500 km or 12 months

2 items

Inspect, clean and gap spark plugs

Engine

Guideline
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Guideline

Every 9,500 km or 12 months

8 items

Inspect coolant hoses and clamps

Engine

Guideline
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 16,000 km or 2 years

2 items

Compression test (or leak-down)

Engine

Guideline
Change gearbox oil

Primary and gearbox

Guideline

Every 19,500 km or 2 years

3 items

Replace air filter element

Fuel and air

Guideline
Clean and grease rear suspension linkage

Rear suspension and frame

Guideline
Grease swingarm pivot

Rear suspension and frame

Guideline

Every 24,000 km 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 25,500 km or 4 years

1 item

Replace spark plugs

Engine

Guideline

Every 29,000 km

1 item

Replace chain and sprockets (wear based)

Final drive

Guideline

Every 32,000 km 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 40,000 km or 6 years

1 item

Replace swingarm bushes / bearings

Rear suspension and frame

Guideline

Every 48,500 km 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

Brake fluid (replace)

Brakes

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * replace every year (also marked as required). Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).

Every 2 years

5 items

Coolant (change)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * change every 2 years (also marked as required). Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Replace coolant

Engine

Guideline
Inspect wiring, bullet connectors and ground points

Ignition and electrics

Guideline
Inspect frame, welds and lugs for cracks

Rear suspension and frame

Guideline
Replace brake fluid

Brakes

Guideline

Every 4 years

3 items

Replace fuel lines

Fuel and air

Guideline

Old rubber and modern ethanol fuel do not mix well.
Inspect brake hoses; replace old rubber

Brakes

Guideline
Rebuild calipers and master cylinders (seals)

Brakes

Guideline

Every 6 years

1 item

Replace tires on age (regardless of tread)

Wheels and tires

Guideline

No interval set

38 items

Chassis fasteners (check)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check all fittings and fasteners and tighten if necessary after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Coolant level and leaks (check)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * after break-in and every race; check hoses for cracks or damage every race; check radiator cap spring operation as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Crankshaft (check, clean)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check for carbon deposits and damage and clean, every fifth race and as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Cylinder (check)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check for score marks or wear after break-in and every race; replace as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Cylinder head (check)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check for carbon deposits and check the head gasket for damage after break-in and every race; tighten head nuts if necessary; replace the head gasket as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Exhaust system (check)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check pipe and muffler for carbon deposits after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Exhaust system (clean)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * clean every fifth race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Kickstarter system (check)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check the idle gear for damage as required; replace if necessary. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Piston (check)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check for carbon deposits and cracks or damage after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Piston (replace)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * replace every fifth race and as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Piston pin and small end bearing (check)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check for damage every race; replace as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Piston rings (check)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check end gap and rings for damage after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Piston rings (replace)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * replace every third race and as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Rear suspension (check, lubricate)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check operation, tighten if necessary, and lubricate with lithium-soap grease after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Spark plug (check, clean, regap)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): check condition, clean and regap after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Spark plug (replace)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): replace as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Throttle grip (check, lubricate)

Engine

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check operation and free play, adjust if necessary, lubricate cable and grip housing, after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Air filter element (clean)

Fuel and air

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * clean after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Air filter element (replace)

Fuel and air

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * replace as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Carburetor (check, adjust, clean)

Fuel and air

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check settings and for obstructions, adjust and clean, after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Fuel line (clean, check)

Fuel and air

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * clean and check for leaks after break-in and every third race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Clutch (check)

Primary and gearbox

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check housing, friction plates, clutch plates and springs for wear or damage after break-in and every race; replace as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Transmission oil (change)

Primary and gearbox

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * change after break-in and every fifth race; check the transmission and replace bearings as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Drive chain (check, adjust, lubricate)

Final drive

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check slack, alignment and condition, adjust and thoroughly lubricate after break-in and every race; replace as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Drive chain roller and support guide (check)

Final drive

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check for wear or damage as required; replace if necessary. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Front fork (check, clean dust seal)

Front end

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check operation and leaks, adjust if necessary, clean the dust seal and lubricate with lithium-soap grease, after break-in and every race; replace oil seals as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Front fork oil (replace)

Front end

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * replace after break-in and every fifth race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Shift forks, guide bars and shift cam (check)

Front end

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check all parts for wear and damage as required; replace if necessary. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Steering head (check)

Front end

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check operation and free play, tighten if necessary, after break-in and every race; replace bearings as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Steering head (clean, lubricate)

Front end

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * clean and lubricate with lithium-soap grease every fifth race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Frame (clean, check)

Rear suspension and frame

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * clean and check for damage after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Shock absorber (check, adjust)

Rear suspension and frame

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check operation and adjust, tighten if necessary, after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Shock absorber (lubricate)

Rear suspension and frame

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * lubricate with lithium-soap grease every third race, and as required after washing the motorcycle or riding in the rain. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Brakes (check, adjust)

Brakes

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * adjust lever position and pedal height, lubricate pivots, check disc surface, check fluid level and leaks, tighten disc, caliper, master cylinder and union bolts, after break-in and every race; replace brake pads as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Rotor nut, flywheel magneto (tighten)

Wheels and tires

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * tighten after break-in and every fifth race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Tires and wheels (check)

Wheels and tires

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check air pressure, wheel runout, spoke looseness and tire wear, and tighten sprocket bolts if necessary, after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Wheel bearings (check, lubricate)

Wheels and tires

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * check for looseness and lubricate with lithium-soap grease every third race; replace as required. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).
Moving parts and cables (lubricate)

Controls and cables

Factory

Factory: Periodic maintenance and lubrication chart (pp.7-2 to 7-6): * after break-in and every race. Columns: after break-in, every race, every third race, every fifth race, as required. From the seventh race, repeat the intervals starting from "every race". Items marked * should be done by a Yamaha dealer (special tools, data and skills).

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.