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Running on three cylinders..carb related?

  • Thread starter Thread starter capnjim
  • Start date Start date
capnjim said:
I'm done...the bike is a 2500$ piece of junk. I spent all day re-building and cleaning the carbs and still only 2 or three cylinders.
What a collosal waste of time and money this stupid thing has been.
Click to expand...

hang on capn. $2500? omg. you're gonna need to sit back, relax and figure this one out. that's way too much to take a loss on.

first - it ran ok when you bought it so we know the basics are there. ya just need to narrow it down. have you looked through basscliff's site? http://members.dslextreme.com/users/bikecliff/

learn about reading the plugs. i can't tell you how much that helps. also, checking compression can tell you alot like whether or not you need valve adjustments or more serious engine work. also check out bob barr's o-ring kit. http://www.cycleorings.com/ (i also soaked each carb for at least 24 hours)

i've returned several old gs's to the road so i know you can do it. good luck.
 
Eli69 said:
you have to look into all of those things and maybe more. sometimes it's hard to rule out any one symptom. here's a list of things that i've had happen that caused running on less than four cylinders:

- gunk from gas tank stopped up a carb.
- bad plug.
- bad spark. (bad wire, wet wire, bad coil, bad points or ignitor problem)
- intake air leaks.
- carb flooding out.
- combination of above and other unknowns.

a complete carb dip and cleaning will at least lower the percentage of bad carb possibilities. i use inline filters on all my bikes too.

read your plugs, check compression, check spark.
Click to expand...
Capnjim,reread this good advice -you must be methodical and rule things out one by one. carbs need thorough cleaning. 34 yearold petcocks are tempting fate
 
The carbs are spotless. I changed the O-rings even though the old ones were nice and supple. I can at least rule out the carbs.
I'll dig into the spark once I get my wind back.
I think it has to be something faulty in the ignition. It was literally one day running perfect, the next day running like crap. Something failed overnight.
 
When you say the carbs are spotless, are you just referring to the parts you can see or did you properly dip them for about 24 hours each to get rid of the junk in the passages you CANNOT see?

I say this because it's very easy to forget about them. I had to tear mine back down after letting them sit all winter after not properly winterizing them; bowl area looked fantastic but I know there was gunk inside the passages.

I know you have put a lot of time and money into this thing and it's frustrating. Trust me I sympathize as I've been there. Your best bet though is to just start over from scratch as though you just got this bike. Go at each of the recommended maintenance items AGAIN and help yourself rule out anything you might have missed. It will probably be something really simple but you won't know for sure without doing that.

Most of the maintenance recommendations don't cost a lot of money especially if you are just reviewing them. You don't need new orings but get some carb dip do them properly. Inspect all your wiring and ensure you have the right voltages where you need them.
 
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The carbs are spotless. I stripped them right down and cleaned every passageway. I didn't dip them as they were pretty much perfect when I took them apart. I mean, they look like new inside and I still sprayed the crap out of them. There was no gunk, residue, or even a tiny speck of dirt. Plus, when I put them back on, the bike was running exactly the same as before I took them apart.
I'm 100% sure the carbs are good.
I'll be moving on to the ignition next. I think the ignition is the only thing that can work perfectly one day, and not the next.
Anyways..I'm sorry to have started two threads on this bike. I think this one is done. I have to think the carbs are good or I am gonna go crazy!!
 
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