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Rejetting for straight pipes?

  • Thread starter Thread starter bohisboh
  • Start date Start date
bohisboh said:
By best I mean optimally rideable including freeway speeds. And I wouldn't mind a little more 'oomph' and some noise, while not being obnoxious.
Click to expand...

Optimally rideable really is a jetting issue more than the pipe, but some pipes can be extremely hard to tune for. It sounds like you want an aftermarket exhaust system in that case. It will still require rejetting, but shouldn't be goofy like your straight pipes likely are. Do you have some pics of the bike showing the exhaust system so we can maybe see what we are dealing with?


Mark
 
Yes I found an older one. Apparently I can only have one file per post? No idea I'm on my phone.
20160518_145824.jpg
 
mmattockx said:
...the engine is small at 650cc and just doesn't have the displacement to sound very big and deep.
Mark
Click to expand...

An old Brit 650 twin with open pipes sounds pretty mean. Although the one I'm recalling may have been modified, at first I thought it was a Harley.
 
bohisboh said:
What specific system did you get, if you don't mind me asking?
Click to expand...


Kerker full 4-1 header with megaphone muffler was on the bike when I bought it. The original exhaust is rusted out. I've really come to appreciate the sound of the Kerker. I don't think it is sold anymore. (for '79 GS550)
 
bohisboh said:
Yes I found an older one. Apparently I can only have one file per post? No idea I'm on my phone.
View attachment 45653
Click to expand...

Ouch. That looks like someone cut the stock pipes and then just tack welded on the extra pipe. In that case your easiest first try may be the Harley take off mufflers if they fit the head pipes where they were cut. That would get you closer to being right with the stock jetting. No matter what you do you are going to have to open the carbs up and see what you have and adjust to suit the exhaust you end up with.


Rob S. said:
An old Brit 650 twin with open pipes sounds pretty mean. Although the one I'm recalling may have been modified, at first I thought it was a Harley.
Click to expand...

Yeah, but that has 325cc cylinders whereas OP's 650 has 162.5cc cylinders. Not nearly as much oomph from the smaller cylinders.


Mark
 
mmattockx said:
Yeah, but that has 325cc cylinders whereas OP's 650 has 162.5cc cylinders. Not nearly as much oomph from the smaller cylinders.
Click to expand...
Actually, they are 168.25cc, but who's counting?

AND, ... since two of them come together, they are pushing 336.5cc through each of the mufflers, which is pretty darn close to the 325cc that you quoted.

.
 
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