High valve overlap engines have always been shit balls to get past emissions testing. That's why they sell them with a substandard one, and leave the power commander/reflash up to you... they can get nicked for selling polluting shite (see VW recently), and you can't. The K5 came out during what, the Euro 3 period? Things are quite a bit harsher now.
I had an injected Blackbird - the 99 model which was the first year after carbs. It was generally acknowledged that a properly set up carbed version was 5-7 km/hr faster than mine but setting up carbs spot on and keeping them there took a bit of work. After that, it all got a bit muddy with emission controls and other mods so comparisons weren't valid.
From my understanding there are a fair few Carby SV650s being raced which do the business fine against the EFI models. Someone may put me wrong there as I haven't been to a nationals round in a few years due to work, family, travel etc.
All I know is that I've recently started working on the carbs for my NC30, seems a less exact science compared to my only comparable FI experience, which was assisting with dyno tuning a few cars on a Link ECU's. Seems like getting a bike running properly on carbs takes a lot of fiddling and above all experience, something I really don't have patience for . Doesn't help when there is 4 of the fucking things!
Down the line I hope to race an EFI bike of some description so I am looking forward to seeing how the turning works on a fuel injected bike as opposed to car. I imagine it is the same, add air, add fuel, add advance relative to throttle input = Power.
I had a Kawasaki Fury 125, '08 and a Yamaha VegaForce I 115, '13. Not identical, but close in specification and the Fury had done about 25,000 km. I bought the Yamaha brand new. The Fury returned 49.67 mpg, 17.58 km/l, and the Vega Force I returned 110.18 mpg, 39 km/l.
Not a very scientific report, but I would say the figures show a clear advantage to the FI.
Both sold now pending return to NZ, (and hopefully a real bike again...)
"Statistics are used as a drunk uses lampposts - for support, not illumination."
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