Ok for those that will want to rip me, its not my first rodeo. I have had over 50 bikes raced offroad motocross but mainly road racing. I just sold my ktm 300 exc i now regret! Purchased a used 450 that is in my opinion a pos. I am an idiot as didnt ride it trusted it would be a bad ass 450. I hope wrong due to $$ just spent. Issues: It will start sometimes. Idles ok for a bit then stumbles finally dies. If ride it. Soon as rip it a little then off throttle fast it wants to die. Once hot its crap shoot if will even re start. Its not hard to kick i have had bikes that required a man to start. Like Husky 610, old beasers to hd's. And Currently my son has ktm 530 and when batt weak it requires a real kick. So its not that and i know proceedure for the 450. Filter clean, seller did new topend 20 hours ago. Plug looks sooty. "rich" if carb i would lean it out. I am at a loss as i dont have access to a diagnostic tool here in Mexico. As well as parts are a bitch to find. Hoping someone has similar issue and it was somthing simple. I must admit short powerband all the hit seems to be in e bottom from the little i have rode it. Also clutch grabby and not very adjustable, have not pulled apart to see if basket is grooved out from the plates and that is issue? Any thoughs appreciated! Thanks!