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After market exhaust

  • Thread starter Thread starter Denman2112
  • Start date Start date
D

Denman2112

Guest
Hello everyone,
I have a 1980 gs 550 ,need new exhaust my question is there any aftermarket products out there that dosent require rejetting ? Im getting some conflicting info just thought id ask the experts
 
I put a MAC 4-1 system on my GS550 and did not do any jetting, I think I shimmed the needles.
Paris%20Blues-4_zpshhncdwhw.jpg
 
Last edited:
Denman2112 said:
Thanks for the info,what is shimming the needles ?
Click to expand...
That is to put tiny washers on the jet needles to lift them a tiny amount, so while accelerating the carb pistons reach the narrow part of the needle sooner and run richer. Easier to do than changing to a larger jet size, and not quite as rich.
 
Of course, you need to keep in mind that all bikes are just a little bit different, so what works for one bike might not work for another.

The only way to determine what YOUR bike needs is to do the modifications you want, then do some testing and see what YOUR spark plugs are telling you about what is happening inside YOUR engine. Adjust from there.

.
 
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