I have a Yamaha Blaster. The standard jet setting is #230, 2nd groove and 1.5 turns out. The manaul says that setting works for temps over 32 and for temps between 5 and 41. What does it have the same setting for 2 temp ranges? I ride in about 20 degree weather. Is the standard setting ok for this temp? Also, what are the chances that you can actually damage your engine if the setting is wrong and your engine is running too lean? What are signs that it's running lean?