Hi, I have an 08 125 PRO and an 04 125 PRO and both can be difficult to start. I say can be because sometimes they start ok but most of the time they don't and from cold they eventually gurgle (not fire) into life without choke and the throttle wide open. I've checked all the usual stuff, carb, aircleaner, plug. It's not just cold starting that's problem, if you leave the bike for about 10 mins and especially on a cold windy day when the engine cools down quickly, it can be very difficult to start and the only way to get them going is to bump start in 4th gear. It's really strange that both bikes should have the same symptoms and they both started playing up at the same time which was September last year. I'm using Yamalube semi-synthetic, 75ml to 5L of fuel. Both bikes seem to run fine whey they are going, it's just the starting that's the problem. Anyone any ideas?