About two years ago, I expressed an interest in buying an XT660R. I didn't in the end. However, now I am having a shuffle around with my bikes meaning I want a supermoto as my second bike. I've considered a Husqvarna 701, but the nearest dealer to me in southwest Portugal is over 200 miles away. And, given that Husqvarna are now owned by KTM, and modern KTMs are, let's say, less than 100 per cent reliable, and even if they weren't, a KTM mechanic once told me that the their supermoto engines were only good for 50,000 miles, I'm coming to the conclusion that an XT660X would be the perfect choice. There's a dealer in Portimao, just down the road, and I like the 660.

Am I correct in thinking that it has a larger flywheel than a KTM690, therefore pulls better really lowdown the rev range?

To the point now, what are the best mods to do to the bike to boost torque and power, whilst not sacrificing any lowdown performance?