@oldman Honestly, I am building this RS and I have literally AJSutton exploading parts open wishing they were SVGs, I know this tool will be useful to restorers who want to know how it all fits together.
@d3cme My DTR was a 2002 and when I removed that boost bottle the bike did not accelerate as fast, plus I lost 10mph off the top speed. As soon as I put it back on the bike was fast again. Now having no bottle may not affect Rpm's but it did slow the bike down. However if the CDI is mapped for a boost bottle, then surely the lack of one would affect the bikes performance???
That is a perfectly fine answer for the MOT to fail, nothing wrong there. Although I disagree with a lot of the MOT regulations, this is one I do agree with. But as Ninja said, just put the stock pipe or a legal pipe on for the MOT. They'll pass it and then just switch it back, easy.