I know this isn't the 150R forum but I can't seem to find an answer anywhere about my son's bike. I've searched for hours and posted about this several times and nothing recommended has worked. My son's 07 150R has never idled right since new. When the climate was colder, I had to use a 45 pilot just to get it to idle at all. I have to run the idle high so it doesn't stall in the turns and even then, if you stop and let the bike run for a few minutes with high idle, it will eventually just drop off and die. To crank it, you have to disregard the general 4 stroke cranking method and give it some throttle WHILE cranking it. With the hotter weather I've went back to a 42 pilot and it runs better but does not idle any better. I've cleaned all of the jets and the A/P nozzle a couple of times and none ever appeared to be clogged. There is one thing that seemed a little odd. When I removed the A/P diaphram the first time there was a rough area with residue under where the spring sits, much like rust. I cleaned it the best I could but it didn't seem relevent at the time. Sorry to post in this thread but I wanted to ask someone who knows what the hell they are talking about. You can move the post if you need too.