I have 6 hours on my crf 450 2005. its been 60 degrees and sea level. stock jetting and settings. after 2 seconds of wide open when you back off it pops a little. also holding it wide open for 5 seconds third gear it kinda crackles a little . maybee hitting rev limiter but i can feel that and the crackle sounds like jetting issue. does stall some times also and is real tricky to start. floods real easy. you think pilot jetting is an issue?