considering that there is no catalyst and it's carburetted, then yes. That is a fairly subjective question and my response is as well seeing as I can't smell it from here
How does it run, is there black smoke? How do the plugs look? When was the last valve adjustment? All things to consider. If you're not sure, ask and I would believe there would be a fellow experienced cogger near you to sniff your........exhaust and you can sniff his, you know, like dogs like to get together and say "GLAND to know ya!"
hahahahahaahhahahahha