rejetted carbs and pods with stock exhaust?

[Guest]

I picked up a 82 GS650GL a few weeks back, and the PO had rejetted the carbs, added some pods, and put a 4 into 1 header on it. It runs really good, lots of power, no flat spots, etc. However, the header has a very distinct harmonic buzz right around 45 mph.. it is a bit annoying. I bought the bike for my wife, and she took it out for the first time today (it's been really chilly) she found it annoying too, but said she'd try to live with it.

My question is: Will it still run good (with reduced power of course) with stock exhaust? I have an 81 GS650G with a good stock exhaust that I was thinking of swapping.

Thoughts? How bad would the stock GS run with the header on it (I'm not going to keep it - planning on putting it on craigslist in abt a month)?

Cheers,
Mike

[Big T]

The Gs and the GLs often have different exhaust hangers due to the different frames - check the parts fiche from Alpha Sports for the parts numbers on each

The G will need some rejetting for the header

I'd recommend finding out why the header is buzzing and fix that, it's the easiest solution
Most likely the back hanger or the baffle

[mhobryan]

Thanks for the advice, and am going to leave as is. The harmonic buzz sounds more like exhaust, than metal on metal flapping/buzzing, but will check it out.

[BassCliff]

Hi,

Have the carbs been vacuum balanced? Are the valves properly adjusted? These help ensure a smooth running engine with much less vibration. Yes, check the hardware to be sure the exhaust is securely hung. Check for exhaust leaks.


Thank you for your indulgence,

BassCliff

[mhobryan]

s

Hi,

Have the carbs been vacuum balanced? Are the valves properly adjusted? These help ensure a smooth running engine with much less vibration. Yes, check the hardware to be sure the exhaust is securely hung. Check for exhaust leaks.


Thank you for your indulgence,

BassCliff

Thanks for the tip, and yes, I've read the top 10 newbie mistakes. . Engine runs surprisingly smooth... I expected it to run like dog manure when I first saw it with the pods and headers, but it has proven otherwise. It has an annoying harmonic exhaust buzz at a specific RPM ... reminds me of my dads old malibu with headers and dual exhaust that he had when i was in high school...cruising at 65 mph on the freeway it had an annoying exhaust note.... so you either sped up or slowed down to get rid of it. Suspect it os just the nature of the header.

BTW - I just bought the bike for my wife .... and have already ordered the valve cover gasket so I can do the valves.

Cheers,
Mike