I would never have believed this unless i saw it with my own eyes.
Recently i purchased a new Hot Grips kit (heated grips) for the ST13. A much needed accessory as i am in Tassie - they could potentially be used 10 months of the year (if your 'soft'). Anyway I put them on for 6 months ago i reckon. All is good. Until recently, i went on a big ride and we stopped afterwards for a chat... I parked the 'girl' in the sun. it was a reasonably warm day - probably 30deg at most. Went home that evening , and a couple of days later noticed something perculiar.... The controller for the hotgrips looked like it had melted... (see image). It was bizzare?! How could this have happened, I haddent even had them on for a month or more? I was 'bamboozled'.
Anyway i took the bike back to the place i bought the hotgrips from and got a replacement controller (Honda Aust). I showed the sales guy. He had the explanation, but said I prob wouldnt believe him. Apparetly ST13's are prone to this, The windscreen magnifies heat and melts plastic if hot sun directs light to the affected area/s, he has seen some plastic on the standard dash begin to warp/melt. He also said that was why the police (when they used ST13's) put in tinted visors to stop this happening.
So there you go - watch where you park the ST13 when in the Sun and the screen up!