Hi Puff, thank you for your lengthy reply. The new battery is much more powerful than the standard fitment, I assumed those interested in the post would be aware of the standard battery specifications. I enjoyed reading your thoughts on air filtration, I'm sure many people share your worries, however I find it an excellent arrangement, that has improved mpg and performance. Also the carbs are performing more smoothly, when I bought the bike 3 years ago the carbs were pretty awful,with sliders constantly sticking and performance on motorways almost unrideable. Since the modifications it's a smooth ride throughout. The previous owner is amazed as it turns out that was the main reason the bike was sold so cheap (£800). Thank goodness it's a free country where I live and I can make my own choices on this