I think that sometimes it doesn't matter what a manufacturer will do to improve their bikes and keep them to current (responsible) emissions standards. There will always be riders who want to modify them and for 99% of our riding, usually with no real benefit, at least in the case of the 1250 which by all accounts is bang-on straight from the factory.
It won't stop people with too much time and money on their hands from trying to "tune" a 1250 though
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If I were now to go ahead with any tuning on my 1200 LC, I think that the AF-XIED, from everything shared in this thread, is clearly the simplest and most likely the best option. Whilst I can see the benefits, it still plays on my conscience that in doing so, I'll be removing emissions controls in fuelling to some extent but more than that, I remain sceptical that any form of tuning is needed, at least to my own bike which is great as standard. It could be improved but it's good enough not to
need improving. It could have a little more low/mid drive but imho, it has more than plenty already. If someone could convince me that it would make the bike more long term reliable, then the emissions arguments start to fade by virtue of whole life carbon footprint considerations.
This is one of the biggest cons currently in the car world where we have a plethora of "clean" tiny engined, highly stressed turbo direct injection petrols....with a lifespan likely half that of a well maintained normally aspirated larger displacement if less efficient motor. What has been found with many of these designs is that especially when cold, they dilute the oil with gasoline (Honda kicked off the whole thing with many claims in the Sattes for failing CRV I think it was engines). Result? No recalls, just a note to dealers suggesting oil changes are changed from 12K to 6K intervals, or to 3K intervals for harsh driving environments like short trips.
Ford have had major issues with their direct injection petrol buzz boxes failing prematurely too (as well as transmission issues). It's all been driven by Euro emissions regulations. Result? Higher carbon footprint due to more scrapped engines in short order and increased oil consumption.
Bikes, by and large, do not seem to have suffered the same fate. The 1250 is a prime example of just what is achievable with good engineering know how.