Stephan Morris

I have had my 1979 XS1100F for over 40 years now. It is the same as your 1978 XS1100E except for cosmetics. I have rebuilt quite a few XS1100 engines I can probably answer any questions you have about these bikes so please do get in touch.

Yes 1U5 is an XS250 1978 for Europe. Many XS250-specific parts will have 1U5 as the model code part of the part number except UK-specific items such as the headlight.

Hello Ronnie 3H3 is the code for a 1979 model Yamaha XS1100SF for the USA. Some of the characterising features are silver engine, chrome pipes, high bars, round headlight and stepped seat. So yours is probably a US model imported to the UK. BW Stephan

Nine years later, but yes I have one of these bikes. Have you still got yours? BW Stephan