I`m having some trouble with my bike,05 yz450f. It`s a bit hard to start I have to kick it like 5- 20 times to get it to start when it`s cold, and if it stops when it is hot it`s almost impossible to start again. And it is popping and backfiring like crazy when I shut of the throttle. My main jet is 170, and pilot is 45. Don`t know where the clip is at the needle. The exhaust is a powerbomb header with a leo vinci silencer, twin air filter and hot stage cams. Hope someone can help me with this.. I`m a bit lost..