Thanks for replying. The oil does look clean, the coolant looks clean when I'm burping bubbles out of it and no cloudiness, the radiator cap sure feels ok and I just replaced it. I actually don't have a service manual - I swear the first time I looked online I couldn't find one even for sale, though today I found a PDF at least. I'll probably do that next. I didn't have time last weekend to do anything but tomorrow I'm going to do one more round of bubble purging. I have a little hope because it definitely seemed to take a lot longer for the temp light to come on once I replaced the thermostat, so maybe now it's just air in the system? Yeah I'm a little surprised and disappointed that I'm just over 500 miles and I have all these problems.
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2018 Yamaha Zuma YW50FJ all stock (so far)
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