A fellow PCer on the PC800 Facebook group dissected the exhaust system from a Honda Pacific Coast and was kind enough to share the photos with me. Unfortunately I don’t remember who gave me the photos. If it was you, please let me know and I will give you credit! Thanks to Jesper Milling for these photos! And thanks to Dolf for figuring out who they came from originally!
This is the muffler. One of the baffles in here causes the tweeting noise that 1989 PC800s are especially plagued with. A weld can crack and fail which makes it tweet or whistle under the right conditions.
Here’s the resonator cavity and how it attaches to the pipes coming from the engine and the muffler.
Another view of the resonator cut open.
The pipes are specific lengths to balance the engine’s twin cylinders.
A view of the dissection with the top half put back on.
One last view of the cutaway in the muffler. This is what makes our bikes wonderfully quiet.
Aha! Mine has the tweeting noise!
Is there a solution? Or is a case of… Replace muffler?
Hi Dolf,
Some people find the tweating pleasant 🙂 Otherwise, you can cut the muffler open and fix the broken weld or replace the muffler with one off of a newer model year. It would be ideal if you could hear the replacement muffler before you bought it to verify there is no tweet.
Cheers,
Douglas in Monterey
Jesper Milling gave you the pictures… I just found the post in the Honda Pacfic Coast PC800 group on facebook…
Aha! Let me go back and fix that… Okay, Done!