I'm an intermediate trail rider. I'm sure the new model 450 has plenty of power, but can I ride it slow easily? Half my time I just want to cruise easy trails or jeep roads. The other half will be more spirited riding. I plan to ride with my kids when they are bigger so that means a lot of putting around. Will I need to install a fan to avoid overheating? Is the EFI too jerky at low rpms? I've been considering the 250 but I am 6'4 and about 260lbs all geared up so Im worried it will not have enough power. I prefer to lug rather than scream a bike.