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GS550 bogging, still running a bit lean

  • Thread starter Thread starter cp___32
  • Start date Start date
I had questioned the Dyna-S a while ago and actually sent it back to them for testing. They sent it back saying they ran it through it's paces (hard) and it worked no problem. So unless something happened between 4 years ago and now after sitting I'm really not sure.

What I need is conclusive proof of one type of malfunction. I still am not sure if it's a carb issue causing the bogging which is causing me to lose spark or if it's a spark issue causing the bike to run rough in that range. I'll keep digging to see what I can come up with. About the only thing I can think now is maybe the battery is hurting at that range for some reason.
Any ideas, please keep em' coming.
 
Hmm. I think you need to set up a mobile lab to debug this further :)

I'm a noob, and just throwing up some ideas here, possibly outlandish:

- Miniaturized Voltmeters are unbelievably cheap on ebay. Like 2 bucks delivered, and they're essentially just a three-digit display with two wires poking out. You could temporarily duct-tape one to your dash, and then be sure what your voltage is at these rpms.
- Maybe get an cheap USB scope with some storage and at least four inputs. Wind some wire around each high tension cable. Plotting afterwards would give a clear picture about ignition pulses, I'd say much clearer than watching a strobe.
- ...also, with the scope one could check out various other stuff, though I can't think of anything else right now. What else would be useful the have measure on these engines? :indecisiveness:

That's for the electrical part, can't think of anything for the rest...maybe stick an O₂ sensor into the exhausts, and record readings, correlate with rpms read from the scope...hrm
 
I picked up a scope and checked the carb behaviour. Unfortunately the scope doesn't have sound but you can see the vacuum cylinder flutter and back flow of fuel into the camera lens. That coincides with the bogging.

I had sealed the diaphragms with a little dialectic grease when I put the caps on the carbs. They were in good shape and had no rips or holes.
Since I don't have a properly running GS I have nothing to compare to but I was hoping this video might shed some light on a diagnosis.

I couldn't get the scope to bend around enough to see the leftmost cylinder so the video shows the other three starting from the right.

Any thoughts would be appreciated.

http://youtu.be/a5OqSU8gYz0
 
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