Guys after 5 years of ‘cold start’ and all the problems that go with it, WOT, fuse #4, out, being trucked twice, and push or jump started got a new battery fitted during a thorough check out by Yamaha (electrical, plugs, starter motor, and fuel delivery system ... no problem found and Yamaha only charged for parts). Bought a battery tester (Ancell BA101), a decent ammeter, and set about the new battery. Could go on for a long while, but the battery (fully charged and new) struggled at temps lower than 4oC (down to -8oC) … like it failed to start and flooded or the starter motor labored and engine caught. When it failed to start, took battery out left in house overnight (no charging), replaced next day (bike temperature -8oC, battery temperature 24oC), F4 out/replace to burn off fuel, and got strong starts every time (even tried after being left at 240C for 90 mins after a no start at -5oC (battery gained 10oC +) and that worked) . Got a lot of data, but bottom line is the BS BTZ 14S battery (new and fully charged) doesn’t have what it takes to guarantee starting my S10 at low temps (though my tester at 0oC says this battery was delivering 270 amps at a cranking voltage of 9.38V), or that my bike requires more CCAs than that stated by Yamaha (my tester says it needs 290 amps + for a good start). What’s more this situation is going to deteriorate with battery age, and my spider senses say this is the root cause of the ‘cold’ start problem. EarthX 36C on order … can’t wait.