Technical Resources for Electronic Fuel Injection EFI OSSA
I bought my first EFI OSSA in the spring of 2014, partly just to study its fuel injection system. I guess you can say I developed a soft spot in my heart/head for them. They were (still are?) such cool bikes. Really ahead of their time, and I do not want to see them relegated to the dustbin of history. I found it nearly impossible to locate any technical information about them and started keeping a digital notebook of things I had reverse-engineered. That notebook has morphed into this website (which is best viewed on a wide screen for ease of navigation). Building the website (a first for me) has been a positive learning experience. It often forced me to turn cryptic notes into readable prose.
Kevin Cameron is one of my favorite authors and a constant source of inspiration. He wrote the following in his October, 2004 TDC column.
Although a relative neophyte to trials, I have a lifetime's experience with motorsports and, in particular, the tuning of two-stroke engines. I bought the TR280i partly to study its fuel injection system.
O.S.S.A. (Orpheo Sincronic Sociedad Anónima) began operations in 1924 making movie projectors in Spain. By 1949 OSSA was making small motorcycles, reached its pinnacle in the 1960s, and continued operating until 1982. In 2010, the OSSA trademark was resurrected by an investment group, and their groundbreaking EFI trials bike was introduced. Steady improvements were made to the bike until OSSA's untimely demise in 2015.
You will see OSSA and Ossa used interchangeably in the literature. I do not know which is truly correct, but because the company name was an acronym, I prefer to make it all uppercase.
I do not speak Spanish, but Mr. Google tells me the English translation of O.S.S.A. is Orpheo Sincronic Limited Company. Given that the company originally built movie projectors, I am guessing Orpheo Sincronic had something to do with synchronizing pictures and sound.
Fun fact: OSSA’s shamrock emblem supposedly represents the escapement mechanism of a movie projector.
Sign outside the factory in Girona, Spain
Multiple sources indicate that the total worldwide production of all fuel-injected OSSAs was about 1000 units (and that would include the Explorer). It is believable, but I have no hard data to support that number. At some point, I would like to create a Registry of VINs and locations. I have learned a few hard numbers such as 55 bikes were initially transferred when the US importer changed ownership. There were a total of 22 bikes sold in New Zealand.
The first two years of production were limited to the TR280i. In 2013, the TR250i and TR300i were added to the lineup. I think very few 125s were produced.
Embedded Links (lack of)
I have resisted the temptation to provide links to things outside my control. Inevitably, those links will become outdated. Instead, I have tried to provide sufficient information so that you can just conduct a current search for the thing that interests you.
Additionally, there is a very effective search tool built into the website - just use the magnifying glass at the upper right-hand corner.
This website is a work in progress. It will eventually contain the sum of my knowledge about EFI OSSAs. If you have information to contribute, you can reach me by sending a private message to user konrad on Trials Central.
This entire website uses Googles Analytics to quantify and improve visitor engagement.