When I start my engines, everything seems fine. When I pull out on the track, I get a sensation the chassis is banging on the ground, but it’s not. Then after a lap, the banging is gone. I’m pretty sure this is the engine. Is this normal or a symptom of a used engine on it’s way to failure?
Don’t over think it. Service your clutch, eg: remove, disassemble, clean/lub, check for damage..reinstall. It could be clutch chatter. Make sure the chain is properly adjusted. If it’s too loose, it might be jumping teeth. 206’s have no HP, so I suspect you’ll find the problem pretty easily.