I'm at a complete loss! I have a 4mil serval with 35pwk air strikers and R2 pipes. It's been running like a raped ape and all the sudden it's cutting out on the top end. Pretty much in a drag race condition, it pulls awesome off the line and about 150-200ft out hitting right around 3rd gear it starts breaking up and cutting out. Thought it might have been lean but the plug are showing that it's rich. Timing is at +4 and shows good on the plugs. Compression is 175lbs in both cylinders. Put a new coil, wires and caps on it and same thing is happening. I was thinking cdi but everything I know about them is either there good or there not. No inbetween. Like I said I'm at a loss. It's feels great down low. Also jetting is at 158- 50 and about 500ft above sea level. Please let me know what you think it is and thank you in advance.