Phil Hawksley's BM Bikes

'The Ultimate BMW Information Site'

   Contact Me

Find Information, Specifications and Images of Your Favourite BMW Motorcycle

Custom Search

About This Site
BMW Press Packs
BMW Model Spec
Engine/Chassis Nos
BMW Photos
Colour Schemes
Annual Colours
BMW Paint Codes
BMW Pin Stripes
BMW Colour Charts
BMW Price Guides
BMW Recall Notices
Mechanical Photos
The Black Museum
BMW Distributors
Clubs Worldwide
BMW Links
Your Help Required
Cookies & Copyright


BMW Motorcycle Engine & Chassis Numbers





For convenience, the Engine and Chassis numbers have been split into various sections. For ease of use, I've kept most engine capacities on one page, however this does mean that

Some pages will be slow to load

I figure a slow page is preferable to lots of little ones so please be patient as the results will be worthwhile.

These pages are now available in PDF format    

R Series to 1969 R Series 450s R Series 500s R Series 600s R Series 650s R Series 650s P2 R Series 750s R Series 800s R Series 800s P2 R Series 900s R Series 1,000s R Series 1000s P2 K75 Series K100 Series K1100 Series K1200 Series F Series Carb F Series Injected R850 Series R1100 Series R1150 Series R1200 Series BMW G Series

Up until the introduction of the Mono-Shock models, engine and chassis numbers were matched, however, the introduction of the K Series machines heralded the demise of this simple means of identification and currently the engine and frame numbers bear no relation to each other over the whole model range. One advantage of the change is that with the later models, it is now possible to tell the year of manufacture of the engine.

As I understand it - no guarantees here!!! A years model production begins after the workers return from the main summer works shut down in the previous year - I believe production starts around the beginning of September for the next years model production.

All Monoshock R Series engine numbers will look something like this: 08/87/0128 - the first two digits refer to the week of production, the second pair indicate 1987 as the production year and the final four digits represent the number in that weeks production.

A K Series engine number will look something like this: 104EA 1799 2032 - the first two digits refer to the engine capacity (1000cc); the third digit shows the number of cylinders; EA is some reference to a Federal Emission Code; sixth & seventh digits are the production week number (week 17); eighth & ninth digits are the year of manufacture (1999); the final four digits are the production number on that weeks production.

Unleaded Fuel

R80 (UK) unleaded from chassis number 6440512 (1985)

R80RT (UK) unleaded from chassis number 6470498 (1985)

R80G/S (UK) unleaded from chassis number 6283306 (1985)

All unleaded head have a blue paint spot near the bottom head nut.

I have no information regarding the exact time that the other R Series machines were changed to unleaded. ALL twin shock machines were designed for leaded fuel and MOST monoshock machines are built for unleaded fuel.

Early K Series machines were designed for leaded fuel - this was changed sometime early in 1985 from the Chassis Numbers listed below.

K100 (UK) unleaded fuel from chassis number 0 007 291

K100RS (UK) unleaded fuel from chassis number 0 081 107

K100RT (UK) unleaded fuel from chassis number 0 024 999

I have no information on the relevant chassis numbers for US models - if anyone has this information, please let me know so it can be included here.

All information I currently have has now been transcribed - there is still much more to come as and when I can get the information although this may not yet be available for current models. If you have information that is not included, please let me have a copy to share with all



Member of BM Riders Club, The BMW Club, BMF, BMWMOA, The Airheads and The Poverty Riders

Check out my other sites at: &