Every figure on this page resolves to one model and year in the book. Pick your bike and the rows that apply to it come forward, with the rest marked.
Open this chapter in the book| Source | What it gives you | Best for | Link | |
|---|---|---|---|---|
| MAX BMW fiche | exploded diagrams + live part numbers + stock | organised by model & production window | the default | Diagrams keyed to production dates, e.g. R100/7T listed as 05/76–07/78 USA — which is exactly the granularity an airhead needs. shop.maxbmw.com/fiche/PartsSearch.aspx |
| MAX BMW part search | number → diagram & fitment | reverse lookup | you already have a number | Paste a number from the table below to see every assembly it appears in. Parts search |
| RealOEM | fiche + supersession history | shows what replaced what | chasing NLA numbers | Useful when a number has been superseded twice and the old one still appears in forum posts. realoem.com |
| EuroMotoElectrics | electrical catalogue by system | application tables | charging, ignition, filtration | Their own guidance: always check the application table, because production month decides fitment. Airhead catalogue |
| The BMW Parts Guy | airhead consumables | numbers listed per item | plugs, pads, filters | Publishes the superseded number chains alongside each part. bmwpartsguy.com |
| Step | Do this | Why | Notes | |
|---|---|---|---|---|
| Find your production month | frame number → build date | not the title year | everything depends on it | BMW rolled model years in September, so a bike titled 1981 may be a “1980” machine or vice versa. Frame 6 095 001 onward is officially a 1979; bikes from September 1980 are “81” models. Your 9/80 changeover chapter explains what actually changes. |
| Pick the right diagram window | match production range | e.g. 05/76–07/78 | fiche accuracy | Fiche pages are split by production window, not model year. Choosing the wrong window is the single most common ordering mistake. |
| Check supersessions | old number → current number | often improved | NLA hunting | A superseded part is frequently the better part — see the carb hose and coil entries below. |
| Part | Number | Fits / note | Chapter | Notes |
|---|---|---|---|---|
| Carb-to-head hose | 13 72 1 254 654 | SI replaces the softer -360 | Carburetion | SI 13-020-90. This is not an ordinary chronological supersession — BMW's service action deliberately goes back to the stiffer -654 hose because the later, softer -360 compound lets the carb vibrate, causing rich running and accelerating needle-slot wear on late slides. Newer is the wrong part here. |
| Rocker shim kit ('85 style) | 11 33 9 057 699 | retrofits '76–'84 heads | Valve Gear | Pair with support bushings 11 12 1 261 405. |
| Low-compression base gasket | 11 11 1 335 650 | 9.5:1 → ~8.8:1 | Upgrades | The pump-gas answer when fitting Siebenrock pistons to a single-plug head. |
| Rear wheel spacer | 36 31 2 301 737 | 10.7 mm (stock 9.2) | Wheels & Tires | BMW's own fix for tight clearance running a 120-section rear. |
| Ignition coil (points era) | 12 13 1 243 452 | Bosch 0 221 101 003 | Electrical | Taller alternative 0 221 124 001. Two 6 V coils in series, 1.5 Ω each. Bosch 0 221 100 028 is the 1981+ electronic coil (12-13-1-244-142) — not this. |
| Coil — known-bad grey | Bosch 0 221 500 200 | replace with 12 13 1 244 426 | Electrical | Failure-prone. Do not buy another of the same. |
| Late single coil + module | 0 221 500 203 · 12 14 1 244 477 | black coil, turquoise-print module | Electrical | Matched pair — coil resistance must suit the module. |
| Spark plugs | 12 12 1 338 145 / 146 · 12 12 9 062 594 | NGK BP6ES family | Electrical | Anti-seize and reduced torque — see the torque chapter. |
| Front brake pad set | 34 11 2 301 358 / 355 / 356 | R60–R100 | Brakes | Check caliper type before ordering — ATE swinging vs fixed. |
| m.lock backup capacitor | Motogadget 4002002 | standalone relay installs | Upgrades | Holds the relay through cranking voltage sag on high-compression engines. |
| Kit | Part no. | Fits | Note | Notes |
|---|---|---|---|---|
| Replacement Kit 1000cc — up to 9/1980 | 1100104 std · 1100105 Extra | R100/7, R100S, R100RS, R100RT · to 9/1980 | iron-liner era · 99 mm | Gives '77–'80 bikes the Nikasil cylinders BMW adopted in 1981: no bore wear, better oil control, plating direct to alloy so heat escapes faster. Includes head gaskets; 9.5:1 pistons ~110 g lighter than stock; SS pushrod tubes pre-installed. |
| Replacement Kit 1000cc — from 9/1980 | 1100100 std · 1100103 Extra | R100, R100CS, R100RS, R100RT, R100GS, R100R · from 9/1980 | post-9/80 crankcase | ~67 hp measured after fitting. Kits split at the autumn-1980 crankcase redesign — the cut-out changed, so order by build date, never model year. These are the complete-kit order numbers. The 1100101 / 1100102 numbers still circulating on forums are gasket-set and component references, not kits — ordering them gets you parts, not an engine. TÜV approval is granted per kit and per application: confirm the certificate covers your exact model and build date rather than assuming it blankets the family. |
| Power Kit 1000cc / Extra | 1100111 · 1100121 · 1100129 · 1100130 | R80 from 9/1980 & earlier 750/900 | upsize | Confirm the exact number against your build date on Siebenrock's kit page — the range covers 97 mm and 99 mm bores separately. |
| 97 mm Power Kit | 1100072 | R50/5, R60/5, R75/5 | /5 models | ABE / EU type approval, mounting hardware included. |
| Power Kit 860cc | 1100860 · 1100861 · 1100870 · 1100871 | R45 · R65 — split by build date and output | short-stroke | ~40% more power, torque from 2240 rpm. Forged pistons in coated liners. Four separate kits, not one: 1100860 for R45 from 9/80, R65GS and 27 hp R65 Monolever; 1100861 for R45 up to 9/80; 1100870 for R65 from 9/80, R65LS and 48 hp R65 Monolever; 1100871 for R65 up to 9/80. Order by build date and by the engine's output version — the older 1125xxx numbers seen in forum posts are not current. |
| Low-compression base gasket | 11111335650 (BMW) | any 9.5:1 kit | pump-gas fix | Drops 9.5:1 to 8.8:1 to eliminate pinging on single-plug heads. Dual-plugging is the alternative. |
| Item | Order code | What it replaces | Source | Notes |
|---|---|---|---|---|
| EnDuraLast 450 W | EDL4 | rotor + stator + diode board + VR | EuroMotoElectrics | Brushless PM system, 450 W / 32 A. /5 models need the starter-relay mod. |
| EnDuraLast 450 W — lithium | EDL4Li | same, LiFePO4 regulation | EuroMotoElectrics | The correct variant for a lithium battery. Never pair lithium with an old mechanical VR. |
| EnDuraLast III | EDL3-107 · EDL3-105 | uprated Bosch-style excited field | EuroMotoElectrics | Keeps stock architecture and GEN-lamp behaviour. -107 for 107 mm stators (1977–1995), -105 for /5 and /6. Verify stator diameter or Bosch number first. |
| EnDuraLast crank ignition | EDL-IGNS | points / bean-can / ATU | EuroMotoElectrics | Mounts to the EDL4 alternator — the matched front-of-engine pair. |
| EnDuraSpark ignition | Hall-effect, Sachse-based | points, condenser, ATU, later ECU + bean can | EuroMotoElectrics | Fits 1970–1995. Configurable single- or dual-plug, dyno-developed advance curves. |
| Adjustable regulator | VR-EXTADJ | fixed-setpoint Bosch VR | EuroMotoElectrics | The AGM undercharge fix — set with a meter at the battery posts. |
| Boyer / Dyna conversions | Micro Digital · Micro-Power · Dyna III | points systems '70–'80 | various | Micro-Power supplies its own coils — a clean dual-plug path. Match coil resistance to the module. |
| Dual-plug coils | Accel 140404 (pair) | two 6 V coils in series | Accel | 0.7 Ω each. |
| Item | Order code | Spec | Source | Notes |
|---|---|---|---|---|
| Motogadget control unit | m.unit blue | 12 in / 10 out, 200 W lamp, 30 A starter | Motogadget | Ground-switched inputs. See the m.unit plate. |
| Bar bus / keyless | m.button · m.lock NFC | Ø12×25 mm · Ø30×14 mm | Motogadget | m.lock reads ~40 mm through non-metal only. Backup capacitor 4002002 for standalone installs. |
| Instruments | motoscope tiny / speedster · mini · pro | Ø49 mm, ~200 mA | Motogadget | Electronic sender sidesteps the speedo W-ratio problem entirely. |
| Signals & mirrors | mo.blaze disc / pin · mo.view | 48 mm inside bar · glassless | Motogadget | Blaze disc is not DOT approved in the US. Budget bar-end space before ordering. |
| Battery — AGM | PC680 (ODS-AGM16L) · PC925 · MBTX30HD · ETX20L · LC-X1228P | 170 CCA (PC680) | Odyssey / MotoBatt / Deka / Panasonic | LC-X1228P is the true OEM-format drop-in. MBTX30HD fits without pulling the subframe. All AGMs suffer the stock-charging undercharge problem. |
| Battery — lithium | NOCO NLP30 class | LiFePO4 + BMS | NOCO / Antigravity | Size for airhead starter draw; pair only with lithium-profile regulation. |
| Front-end conversion | offsets 30 / 45 / 50 / 55 / 60 mm | stem + trees + All Balls taper set | Cognito Moto | 45–60 mm for 18–19″ wheels; 30 mm only for 17″. R nineT kit uses 45 mm with their wheel adapter. |
| Suspension | Ikon · Hagon · YSS shocks · Progressive springs | match rate to stripped weight | various | Café builds are over-sprung on stock rates. |
| Spokes | custom-cut stainless sets | any hub/rim combination | Buchanan's | The wheel-lacing standard. |
| Coatings | C-7600 · C-7700 · C-7800 · C-7900 · C-8200 · C-110 | Glacier series, 1,800 °F air cure | Cerakote | Black, Silver, Gold, Titanium, Forge; C-110 Micro Slick is the dry-film lubricant. |
| Transmission tooling | shim kits + measuring plates | 52 / 48 / 47 / 39 mm | Cycle Works | Oilhead 47/52 mm shims (0.30–0.55, 0.05 steps) substitute for NLA sizes. |