So, I purchased my 426 in mid-January knowing that it had a blown top end and would need a complete rebuild. The first thing I did, which has proven to be the most valuable step I could imagine, was to sign up for TT. Well, after 3 months of buying parts, asking for help, rebuilding, tearing down, rebuilding, and so on, I finally heard the beast run today...Too bad it isn't running right. I've used the search function and read hundreds of posts from people with similar problems to mine, I just want to make sure I'm on the right track. The bike started today after 5 or 6 kicks. It would run when I was working the throttle, but wouldn't idle, was misfiring constantly, and wouldn't wind out like I think it should. It would die, I'd start it again. No trouble starting, just running and running smooth. After it cooled off, I tore it back down, rechecked timing and valve clearance. Timing looked good and my center intake valve was .03mm on the tight side. On the way home, I purchased a new shim in order to fix that tomorrow. I also removed the carb, gave it a thorough cleaning and checked the jetting (its mostly stock, except for the needle clip and I'm at 5000'). When I pulled the plug, it was carbon fouled (black and dry) and it was a new plug this morning. Tomorrow I'm planning to fix the valve clearance, put in another new plug (purchased the iridium this time), new air filter, check timing again, make sure the choke and hot start are functioning, put fresh gas in (that I purchased today), and give it another go. Any other suggestions? Am I on the right track? Thanks again for all your help. You guys are the best!!