With reference to the TTR and TTRE, I have both. The internal gearing and final drive ratios are different. The ignition is different, this is because one has a battery-one does not. The mystery wire on the TTR alters the ignition to affect noise and emissions regs, disconnecting it does make a small difference. The TTR does feel a little more powerful on the "seat of the pants dyno", this is probably also due to reduced weight, suspension travel and gearing. I run mine and the wife's (3x TTRE, 1x TTR). with airbox snorkel removed and Arrow paris dakar stainless pipe.
They are not powerful beasts, the only time I have ever managed to wheelie mine was by accident off road. That said, they will haul you and your luggage anywhere you want to go. I have run mine at approx 4500m with no no noticable difference in pulling power. with standard carb and jetting you should get good mpg too.
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