Exhaust gasket for Honda CT90, also known as the "Trail 90."
Tick, tick, tick... What's that sound coming from the cylinder head? It's likely an exhaust leak, especially since the exhaust pipe is frequently removed and reattached. The exhaust gasket sits between the cylinder head's exhaust port and the exhaust pipe of your Trail 90. Over time, the gasket can become compressed and coated with carbon, making it easy to overlook. Replacing it with a fresh one should fix the issue.
Closely examine the exhaust port. If you can't see any aluminum, the old gasket is still in place. Use a small screwdriver to scrape off the carbon buildup until you reach the gasket, then carefully pry it out.
