1. engine oil.. oil filter.. spark plug... just regular stuff like that same as any other bike.
2. coolant, just flush and change once a year.
3. front fork can tune the soften or harden with flat head screw driver just easy to play around .. nothing will go wrong.
* i have not tried to play around with rear suspension.
4. TDM can tune CO ratio (fuel mixture rich or lean) and TPS (throttle position sensor) by dashboard.
read through the manual for diagnosis section.
or try to look for yellow TDM at LC food court ..