Zundapp · Zundapp KS601 / KS750 flat twin (1938-1958)

KS601 / KS750 / K800

Library entry covers 1933-1958

18 factory 47 guideline

Published source

Zundapp Motorrad Typ KS 601 Beschreibung und Bedienungsanweisung (Zundapp-Werke GmbH, Nurnberg, 1951), Section D Pflege pp.23-30, Schmierplan p.32. Original held by Deutsches Technikmuseum Berlin, inv. I.2.002 B TO 0027-06

Factory owner's handbook. Covers Zundapp KS 601 Betriebsanleitung (Beschreibung und Bedienungsanweisung), Zundapp-Werke Nurnberg, 1951; covers the KS 601 (597 cc OHV flat twin, shaft drive); intervals in km in the original.

Open the source

65 items for a 1933 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: Four-stroke
Engine lubrication: Wet sump (oil in crankcase)
Oil filtration: Mesh screens / strainers only
Valve gear: Overhead valve, pushrods, adjustable tappets
Ignition: Battery and coil with contact points
Charging: DC generator with regulator
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: Shaft
Front suspension: Telescopic fork
Rear suspension: Plunger
Front brake: Drum (or band / stirrup)
Rear brake: Drum (or band / belt rim)
Wheels: Spoked, tubed
Sidecar: No sidecar

Maintenance schedule

1933 Zundapp KS601 / KS750 / K800

On the road: every 200 mi

1 item

Check engine oil level

Pre-ride / on the road

Guideline

Each fuel stop on old machines. Dry sump: check the tank hot, engine idling or just stopped, per your manual.

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 500 mi

1 item

Walk-around: check nuts and bolts for vibration loosening

Pre-ride / on the road

Guideline

Old machines shake things loose: exhaust nuts, mudguard stays, footrests, tank mounts, battery strap.

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

Every 621 mi

4 items

Check battery electrolyte, top up with distilled water

Ignition and electrics

Factory

Manual: Battery: check acid level, top up with distilled water. Factory: Section D Pflege
Check gearbox oil level

Primary and gearbox

Factory

Manual: Gearbox oil level check. Factory: Section D Pflege: top up to filler height
Check final drive for leaks and bearing play

Final drive

Factory

Manual: Rear drive (Hinterachsgetriebe) oil level check. Factory: Section D Pflege
Lubricate control cables and lever pivots

Controls and cables

Factory

Manual: Oil the hand lever pivots and the gearchange linkage joints. Factory: Section D Pflege: also after every wash

Every 1,000 mi or 6 months

5 items

Lubricate manual advance / retard control and cable

Ignition and electrics

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 1,000 mi or 12 months

1 item

Grease saddle pivot, check saddle springs / seat post

Rear suspension and frame

Guideline

Every 1,243 mi

1 item

Check and adjust valve clearances

Engine

Factory

Manual: Check valve clearance, cold engine (inlet 0.20 mm, exhaust 0.25 mm). Factory: Section D Pflege: new or overhauled engine first at 500 km

Every 1,500 mi or 6 months

1 item

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.

Every 1,500 mi or 12 months

1 item

Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Guideline

Every 1,864 mi

1 item

Change engine oil

Engine

Factory

Manual: Engine oil change (drain warm, refill 2.0 litres). Factory: Section D Pflege: every 3000 km; 2000 km in tropical and dusty areas; new or rebuilt engine has earlier break-in changes

Every 3,000 mi or 12 months

13 items

Check engine mounting bolts and plates

Engine

Guideline
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
Check generator drive belt or chain

Ignition and electrics

Guideline
Oil / check generator bearings (where an oiler is fitted)

Ignition and electrics

Guideline
Adjust clutch pushrod / clutch adjuster

Primary and gearbox

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
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

7 items

Inspect, clean and gap spark plugs

Engine

Factory

Manual: Clean spark plugs and check electrode gap (0.7 mm). Factory: Section D Pflege: listed with the contact breaker work in the maintenance overview
Inspect fuel tank for rust, sealer failure, leaks

Fuel and air

Factory

Manual: Tighten fuel tank mounting bolts and check fuel tap nuts. Factory: Section D Pflege
Clean and gap contact breaker points, oil cam felt

Ignition and electrics

Factory

Manual: Clean and check contact breaker points (gap 0.3-0.4 mm), re-grease cam felt. Factory: Section D Pflege
Inspect wiring, bullet connectors and ground points

Ignition and electrics

Factory

Manual: Lighting system and wiring: check connections and insulation. Factory: Section D Pflege
Change fork oil

Front end

Factory

Manual: Telescopic fork oil change (150 cc per leg). Factory: Section D Pflege: SAE 40 above +15 C, SAE 20 below
Grease plunger rear suspension, check springs and bushes

Rear suspension and frame

Factory

Manual: Rear suspension: grease the nipples on the upper spring guides. Factory: Section D Pflege
Inspect frame, welds and lugs for cracks

Rear suspension and frame

Factory

Manual: Frame: grease the grease nipples and tighten all frame fastenings. Factory: Section D Pflege

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 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

3 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
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

3 items

Check engine breather and oil return

Engine

Guideline
Lubricate and check automatic advance unit

Ignition and electrics

Guideline
Repack / replace wheel bearings

Wheels and tires

Guideline

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

Every 6,214 mi

5 items

Clean oil strainers / mesh screens

Engine

Factory

Manual: Remove and clean oil sump, replace oil filter screen basket and sump gasket. Factory: Section D Pflege
Inspect generator brushes and commutator

Ignition and electrics

Factory

Manual: Check generator (Lichtzundmaschine) carbon brushes. Factory: Section D Pflege: or sooner if the red charge lamp stays on
Change gearbox oil

Primary and gearbox

Factory

Manual: Gearbox oil change (0.75 litre). Factory: Section D Pflege: new or overhauled gearbox first at 2000 km
Change final drive (rear drive) oil

Final drive

Factory

Manual: Rear drive oil change. Factory: Section D Pflege: new or overhauled rear drive first at 2000 km
Lubricate drive shaft splines / check U-joint

Final drive

Factory

Manual: Drive shaft (Gelenkwelle): grease at the grease nipples. Factory: Section D Pflege

Every 8,000 mi or 3 years

1 item

Decarbonize head, grind / lap valves (top-end decoke)

Engine

Guideline

Period practice. Leaded-era valve seats may need hardened seats for unleaded fuel.

Every 10,000 mi or 2 years

1 item

Compression test (or leak-down)

Engine

Guideline

Every 10,000 mi or 3 years

1 item

Repack / replace steering head bearings

Front end

Guideline

Many old machines use loose balls in cups and cones. Taper roller conversions are common.

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 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 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.