Hello, I’m new to this forum and to the xs650. I recently purchased a stockish 77. I have a fair amount of work ahead of me to get it road worthy but hopefully nothing major. As of now it looks like alot of wear items. For example swing arm bushing, neck bearings, fork seals and other odds and ends. I found it on FB. I’m looking forward to resurrecting her. I have searched the forum and the internet looking to find a particular muffler I saw on YouTube. I have found the same looking muffler but listening to the sound bites they aren’t even close to the one I’m after. I was able to contact to builder of the xs with these mufflers. He told me he made the mufflers but wouldn’t tell me how he made them. I’m hoping someone on here will know what these are or how to recreate that sound. Anyway, thank you for having me and thanks in advance for any help.
This is something I dont know much about
But it sounds as if it is what they call a re phased engine
more of Those
The build there is of exceptional quality ( The first the Japanese bike ) not anyone that can do it
and lot of effort and money put in
It does not have stock carburetors as far as I can see
If you ask me the throttle response is not perfect but close it is perhaps cold there
Mufflers is difficult to get right ..Not sure if those are bought of the shelf
But back in the day people had straight pipes
Trying a google translate --- there was a saying that rhymes in Swedish
" Straight pipes so that the Torque dies "
Exhausts pipes even in the 60 ies and 70 ies was a result of trial and error
Inside the pipe there is a pressure wave that turns back at the open end reflects and goes back
It affects the pressure inside the combustion chamber
Stock has some sound damping inside muffler that affects the pressure inside the pipe
If as some did put on straight pipes with " Wrong " length and internal pressure
the bike would run poorly. It would run with less power Making more noise.
If I recall right it was even more sensitive with 2 stroke engines
I remember reading that some put in a disc on a axle inside the pipe towards the end turn it locking the axle
and getting the pressure up Inside Test ride and adjust .. .not sure what it is called in English Choke ???
Harleys in those days there was no dyno for testing
So all in all
That can be a re phased engine
Not stock carburetors
With on the dyno fine tuned exhausts
With unknown internals
It Looks as a Japanese bike worth noting is the better compression on the first bike
The second not smoking
The Jap is kicking two times before starting ( It can be coincidence ) that is what vintage Harley owners do ..and there in the background sits an Harley Showelhead Motor
Again this is nothing I have been into just heard of it and read --- I go for stock --but worn stock --since that was what many did in the beginning Only thing they could afford " Chrome wont get you home "
If I am wrong please tell that here