If you get a 15 the suspension is much better and the guage cluster is badass
As far as durability. The swingarm to the frame is the weak point, if the rear of the bike were to get bound in a rut or a rock I would suspect you could early tweak the frame to a un rideable state. The tolerance I between the swingarm and the bike is small, and a hard jerk one side or the other you can make the swingarm rub on the frame....
Let me repeat to make it very clear this is NOT ever going to happen if you drop the bike or crash under 25 mph in which case the bike is my least worry crashing over 25 mph I'd be more worried about myself being ok
I have dropped the bike probably 10 times in a single trail riding experience well most here would consider it more bush wacking....
As far as the bike itself
There has been huge discussion about washing your bikes here; I have not commented strictly on the fact that some member bashed others.
More so with the s and sr. But the fx is the most popular bike, and despite the "demographic thread" zero has sold more fx's than all other models combined
I'll just leave this here.
I have rode these bike if the pooring rain; they can work fine if you remove the batteries and dry them off
When I wash them I remove batteries hang them up and pressure wash them
I avoid the octopus "where the battery's lay in the frame" and the controller below, you can spray the fins of the controller from underneath but svoid getting tons of water ontop, if you do soak the whole bike dry it off with some compressed air or even a leaf blower will help to get the larger droplets out of the odd areas
Now some bikes from the factory got more or less dielectric grease; if your battery connections look like they need some add some
The whole maintenance free is nice; but let's all be real individuals. We don't live in a dream world where nothing ever needs maintenance. Yes they need less than a gas bike, but that doesn't mean they are free of it. IMO if I did not know zero from the beginning almost 10 years ago now getting parts and help would be a whole different issue like I see on here a lot. If you buy a 15 brand new you are going to get a nice warrantee that should more than cover the bike and any issues that it may have; of I were buying a 15fx I wouldn't be worried about having issues with it. Most people have issues with the S bikes and the problem is they have battery issues and that can be a huge hindrance because to remove the batter you must lift the bike over the battery, basically removing a motor from a car
Ok onto your next questions; hot rodding or playing with the electronics. If your going to buy a new fx; see if they will sell you a mmx; it is the fx but with the street motor. Much better bike won't run into the "lag" that the smaller motor has
With the bigger motor you cannot overheat the fx then; with stock motor at 80mph plus the motor will throw the thermal light and you will have to slow to 70 ish to maintain speed and the motor will cool to safe operating range
Having ridden a fx and mmx back to back for a long time, the best comparison is the pure acceleration over the stock fx; yes before I explain how much faster let it be known that the bigger motor uses more power all the time so technically range should go down, but I hve yet to be able to tell a difference in the real world.
So back to the acceleration and settings you can't exaclty just add more power through the settings, you can change the "sensitivity" of the throttle and it can give to "more" quicker.
The fx will wheelie from 32-50 before you notice a little less power
The mmx will wheelie from 20-70.
The fx won't really power wheelie at 50. The mmx can