Need carb help on CB350G

m511y

m511y

Less is more
I was syncing my carbs and all was good, but when going on a test ride I noticed my right carb was sputtering whenever I would first turn the throttle. The Left carb was fine. When starting from a stop, the right carb would sputter and then eventually fire just fine. This leaves me to believe it is a pilot issue and that the main jet and needle is fine.

At first I figured it must be a vacuum leak so I sprayed all over the carb and intake boot with starting fluid. No idle surges. Then I thought maybe the pilot screw was clogged so I removed it while giving it just a little gas, and I could hear the pilot sucking in air.

I checked the plugs and they looked lean, so I though maybe there was a fuel line clog. I checked the line and it is flowing just fine. (now I smell like gas :-[)

If I slowly roll on the throttle it acts close to normal, but if I crack the throttle back, the right cylinder dies.

What am I missing??? Figured I would ask before breaking the carb down. I hate opening up my carbs. Jetting them was a pain in the ass.
 
Anyone Thoughts? I guess I'll just be cracking opent he carb after work to see what I can see. Another thought would be that maybe the float valve is stuck. Would that cause it to flutter when first applying the throttle? Is it possible this could be a battery issue? I know when the batteries on these bikes go bat they can act funny. What’s a good way to check if I need to replace it or not?
 
djelliott said:
Check your timing and points gap too.
Click to expand...

I just replaced the points and did a full tune up including timing before I went on the test ride where I noticed the issue.
 
Now I don't think it is carb related at all. I hooked up a timing light to the right cylinder plug and when I lifted the throttle on the right carb, the light stopped blinking meaning the plug wasn't firing. Now it is back to the drawing board to diagnose the electrical issue. Points (They are brand new)? Coil? Battery? Condenser? Who knows.
 
Take off the plug boots and cut the wires back like a 1/4 inch. Might not be making a solid connection.
 
Could just be a bad plug (I've had them fail straight out of the packet before....).

Swap the plugs over and see if the problem goes to the other cylinder. If it does, it's the plug. If not, then it's somewhere else in that side of the ignition system.
 
hillsy said:
Could just be a bad plug (I've had them fail straight out of the packet before....).

Swap the plugs over and see if the problem goes to the other cylinder. If it does, it's the plug. If not, then it's somewhere else in that side of the ignition system.
Click to expand...

I'll swap plugs and see if that changes. If that doesn't work I'll trim back 1/4 of the wires.

If neither of these work, how do I go about testing the coils, battery, and any other possible cause.

It only happens to the right plug when the throttle is blipped. If I open it slow the issue isn't there.
 
Im having the same exact issue the OP has, i already tried switching the coil and nothing, big rich game a sugestion, that maybe theres an overly rich mixture and thats why it isnt firing, loosing the spark plug cap increase the resistance and gives a bigger charge
 
actually that was me, medium rich. big rich is one of the other thirty guys here named rich
 
no problem. big rich knows the GS bikes really well and I'm an insufferable asshole. hope that helps.
 
It's too late to start the bike and start messing with the throttle. I'll give it another crack after work tomorrow. First up are swapping the plugs and trimming wires 1/4 an inch. As of right now I'm going over the Clymers electrical section to see what I can see. I'll keep everyone posted. See you in 24 hours.
 
I cut a 1/4 off the cables and swapped out the plug on that side and there was little to no change. Once again,
if I slowly pull up the throttle on the side of the right carb it works fine. If I blip it real quick, it sputters because of lack of spark. It isn't the carb, timing, points, battery is fully charged, plugs, or wires. I guess my next step is to start trouble shooting the coils.
 
That is not symptomatic of coil failure - sounds like carb sync or timing.
 
I figured out what the issue was and I feel like an idiot. I can't believe I didn't notice this sooner, but over time my fuel lines had kinked and became brittle. I replaced them and all of the sluggish symptoms went away. The bike rides great now. I really wish I noticed this sooner and I wouldn’t have wasted a riding season trying to sort such a simple problem out.
 
That's cool man. At least you found it and now have more wisdom because of it for the next time the issue ever comes up. You may end up helping someone else in the future with this knowledge.
 
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