I'm sometimes asked if a checklist exists that a BMW Isetta eBay buyer or seller could use to document a car and its condition. This is a list of major items that you would want to know about and at least give you some clues as to the car's condition and missing parts, etc. I will add to the list as I get input from other Isetta owners.

There is a lot of detail in these seeemingly simple cars and although parts are available they are fairly expensive.  Thanks and best wishes for happy Isetta driving and lots of smiles per gallon... Richard

General 
  Serial number on fender plate
  Year on fender plate (if shown)
  Serial number fender plate riveted or screwed?
  Frame number stamping
  Engine serial number
  Currently license?
  Does title exist?
  
Electrical 
  Wiring blocks on inner fenders, firewall area
  Wiring itself
  Horn
  Turn signals
  Headlights (high and low beam)
  Brake lights
  Dash lights
  Voltage regulator
  Battery condition
  Battery cover (hot seat preventer)
  Battery ground strap condition
  Harness/Body grommets condition
  Fuse box condition
  Under dash wiring appearance
  Dash conduit condition
  
Tires and wheels 
  Tire brand and size
  Tire condition
  Tube valve straight
  Wheel type (solid or split)
  Wheel condition (straight and lip bends)
  Tires match?
  Wheels match?
  Hub caps condition
  Spare tire?
  Jack and Handle
  Tools
  
Fuel system 
  Tank leaking?
  Shut off valve leaking?
  Fuel hose condition
  Body to air cleaner hose condition
  Air cleaner to carb hose condition
  Carb fuel filter in place
  Fuel cap type and condition
  Tank rusty or has it been coated?
  Filler to body rubber grommet condition
  Filter cannister condition
  Air filter element condition
  
Engine 
  Ground strap in place
  Coil & condensor and connections condition
  Plug wire to metal ducting grommet
  Oil leakage
  Oil condition
  Connecting rod material, if known (steel is desireable)
  Domed points cover installed on fan
  Starter post condition
  Engine mount condition (4)
  Throttle cable condition
  Choke cable condition
  Heater cable and flapper
  Fan blade condition
  Fan cover condition
  Fan to body boot condition
  Sheet metal air ducting condition
  Engine shroud heater hose
  
Clutch 
  Clutch slippage evident?
  Clutch cable condition
  Clutch adjuster condition
  Clutch lever condition (bent by coupling failure?)
  
Transmission 
  Oil leakage?
  Couplings condition
  Bolts facing right way?
  Shift rods straight
  Rubber rod bushings OK?
  Shift rod firewall boot condition
  Shifting bell crank condition
  Shifting operational
  Shift lever return spring in place
  Case damage from coupler visible?
  Transmission pops out of gear?
  
Chaincase 
  Chain case appearance
  Case damage from coupler visible?
  Tension adjuster in place
  Speedometer cable condition
  Speedo works
  Mileage shown
  
Body 
  Rust visible?
  Paint condition
  Pedal linkage cover in place
  Convertible top condition
  Latch mechanism
  Window rubber condition
  Front door seal condition
  Door hinge condition
  Hinge rubber boots condition
  Engine cover in place
  Front Door Bumper condition
  Front Nerf Bar condition
  Rear Bumper condition
  Rear Nerf Bar condition
  Exterior Rack condition (if present)
  Windshield glass condition
  Side window glass condition
  Rear window glass condition
  Floor condition (dents, holes, etc )
  Battery floor box condition
  
  
Interior 
  General appearance
  front door panel condition
  side panel condition
  package tray condition
  Seat condition
  kick panel condition
  rubber mat condition
  rubber brake and clutch pedal cover condition
  Pedal linkage safety cotter pins in place
  Steering wheel and horn button condition
  Dash finish appearance
  Turn signal switch cover and knob cosmetics
  Defroster and hose condition
  Heater control condition
  
Brakes 
  Hydraulic brakes work
  Fluid level and condition
  Master cylinder condition
  Brake hose condition (3)
  Brake tubing condition
  Tubing mounted solid
  Hand brake operation
  Hand brake cable condition
  
  
Suspension 
  front shocks condition
  rear shocks condition
  steering damper present?
  steering tie rod straight
  steering linkage end bushings good (4)
  wheel bearing play
  All steering/suspension safety cotter pins in place
  Rear axle hub nuts and cotter pins in place
  
Frame  
  Frame paint condition
  Any obvious bends in frame?
  Body mounting tabs missing?