I'll bet you're wondering how those two are connected. Actually, they aren't. I have a 1971 Yamaha xs1-b, almost pure stock, and I have two questions for all of the Yamaha wizards out there. First question. Somewhere on this site I read that the oil level should be maintained half way between the two marks on the dipstick. Why not just fill it all the way up to the full mark? Second question.My turn signals only work up to about 3500 RPM. At that point they start flashing really fast, and then at about 4000 RPM, they just shut off. Neither of these things make a darn bit of sense to me. Thanks for any help you can offer.