I have a 2006 yamaha raptor 700r that's been giving me a weird problem. On heavy acceleration, it makes a loud "click" noise, it keeps clicking every second or so (the heavier the acceleration the faster the clicks) until I ease off of the throttle. It will do this on hills, straight aways, whatever, anytime acceleration is above about 75% throttle.When i accelerate little by little until my throttle is at 100% i do not hear the click only when wgen my rpm is low and i try to accelerate almost having my throttle at 75 %. The sound appears to be coming from the front 1/2 of the bike. I can't tell if the sound is coming from the head/valve area, or coming out of the CVT breather tube not sure i just had a new piston,ring,cilinder,clean valves .. other words an overhaul and timing belt .. bike runs good but im kinda worried on that noise .. pleade help guys