This bike has given me so many headaches. first of all new cns carbs dont work. mine never worked, i spent hours and hours trying to get it to work. ive done everything but bore out the jets. sorry but this stuff needs to work right out the box. got an nt and life got better. Also i replaced the throttle it came with(plastic junk broke so fast. the muffler kept falling off(threads where stripped). I tryed to re thread the bolts but it ended up making things worse. now i have a big hole that have messed up threading and the heliocoil wont work. looks like my only option is to get a new cylinder head. I am trying JB right now. I doubt it will work but im out of options. i dont think i can make the hole bigger safely. any suggestions.???