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1979 gs850 noise

  • Thread starter Thread starter ford_raccoon
  • Start date Start date
F

ford_raccoon

Guest
Ok so here it goes, I got my carbs all straightened out and shes running good but I seem to have a problem. When shes at a hot idle I can hear a knocking sounds but it doesnt do it every revolution. So what could it be? It makes two knocks then stops for one second then two knocks and then stops for a second and it keeps doin that while its at idle. What could it be??
 
Cam Chain?

Cam Chain?

Might be a tight spot in your cam chain, my old 750c made a noise like that it's whole life, I think now, later, affecting it's so-so power availability. Never let me down, tho-broke my heart when my son totalled it:mad:.
 
maybe post a you tube video with sound and it will be clearer as to what you are hearing..
 
Assuming the carbs are in sync, sounds like it may be a classic example of a knock caused by camshaft end float.

It's fairly common on early 850s and 750s, and it's completely harmless.

The fix is rather involved, and again, the noise is harmless, but here is it anyway.:
http://bwringer.com/gs/cam_end_float_mod.pdf
 
Yep, goin' with bwringer on this one. If it goes away by the time you get the engine up to about 1500 rpm, it's likely cam end float.

My wife's bike came with that 'feature' already installed, still runs well over 20,000 miles later. Nothing to worry about.

.
 
i bet it's the clutch basket loose springs quandary that is so common
not the cam end float
 
Mine does the same thing. Rpm's over 1500 and it goes away. I'm dealing with it considering what the fix would be.
 
I have no clue whats wrong with your bike so I'll just sip my beer and agree with bwringer and steve.
 
Hi,

If it is cam end float, I've heard here that installing your half moons backwards might quiet down the engine at idle. Some like installing them backwards anyway just so they don't pop out and make a mess.


Thank you for your indulgence,

BassCliff
 
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