I installed a YZ450F exhaust cam today. I also had the carb off to slightly clean. Anyways, it started after a little bit trying to get fuel in the carb. Once started I jetted up and down the block with no problems. Felt pretty nice. Nice 3rd and 4th gear wheelies. Anyways after I shut it down I restarted using electric start and it backfireed once. Then started. It seems to be able to repeat this. I have to give it pretty heavy throttle to start it. If I kick it, it starts on the first time, everytime. So my thoughts are I either missed everything by a tooth. (TOC was suspicious when I removed it anyways). Or the YZ must have a bigger Starter jet. I'm still stock on starter jet (book says 65, yamaha says 60). To anyone who has ever had their cams out, I'm assuming to be off, it would be way of at the timing mark??? Mine was closer to the small dash (to the right of)before the horizontal (I). Would it even run a tooth off? Suggestions? I'm taking it out tomorrow for testing.