Right carb too rich

[mat]

I have been fighting a weird problem with my Banshee for the past few weeks. It hasn't been running right, it just won't clean out and run good.

I checked compression and it was fine. I performed a leak down test, results were good. I haven't touched the jetting since it was 70

[Timmy301]

When you cleaned the carbs did you take out the pilot and look through it? I had the same problem, I was pissed. I took the carbs apart again and sure enough it was that freakin pilot!!

[fixitrod]

Maybe your jets aren't drilled accuratley. A clogged circuit could cause you trouble too. Maybe something went through the carb and ruined the circuit. Maybe there is an air leak in the choke plunger.

[mat]

When you cleaned the carbs did you take out the pilot and look through it? I had the same problem, I was pissed. I took the carbs apart again and sure enough it was that freakin pilot!!

312203[/snapback]

 

 

I didn't look through it. I assumed that since it idled that the pilot was OK. I'll double check this tomorrow.

[mat]

I checked the pilot jet and it had a little bit of crud in it. I cleaned it out and now it idles better. But this didn't affect my major problem at all. I dropped 4 jet sizes on the troublesome carb and it made no difference. I know that my silencers need repacking, so I put my stock ones back on to make sure that this wasn't causing any problems. This resulted in no change, except that it is quieter now. I have adjusted my needle and it makes no difference. I plugged the ports where the choke tube would go. I don't think that my float is sticking or that my needle is leaking because the carb doesn't leak any gas. The only thing that I can think of, that I haven't tried yet, is new gas. The gas that is in the tank isn't but a couple of months old, but I am out of other options.

Does anybody have any other ideas?

[ssanddemon]

Please tell me you have replaced the needle and seat. If so, check to see if the floats both weigh the same. Easiest way to do this is by making a balance beam with a piece of fine wire about 6-8" long. If it really is running too rich, a heavy (leaking, full of gas) float or a defective needle and seat are about the only causes other than wrong jetting. Plugged jets make it run lean . I have chased a very similar problem this week, turned out (I think) to be a topend problem. See 'Banshee Cylinder Not Firing' on this board for the sordid tale.

[Cotton eyed Joe]

Please tell me you have replaced the needle and seat. If so, check to see if the floats both weigh the same. Easiest way to do this is by making a balance beam with a piece of fine wire about 6-8" long. If it really is running too rich, a heavy (leaking, full of gas) float or a defective needle and seat are about the only causes other than wrong jetting. Plugged jets make it run lean . I have chased a very similar problem this week, turned out (I think) to be a topend problem. See 'Banshee Cylinder Not Firing' on this board for the sordid tale.

314711[/snapback]

I agree. Check your needle valve and seat. Mine has given me trouble before, and its something the size of a speck of dust that will do it. It will either leak or stick open. Also, if its worn or cracked etc...

[SuperChris]

Did you look to see that the choke hose was connected?

[mat]

I spent some more time trying to figure this out last night. I am now totally convinced that there is something wrong with the right carb. I just can't figure it out. I have now begun the search for another set of carbs. Here is what I did last night, and the results.

 

Cleaned right carb again. Removed needle and seat. Inspected seat seal, seat, and needle. Everything looked good, so I cleaned them again and reinstalled the carb, making sure that the choke tube was installed properly.

Results: It ran the same. Idled OK, but right side cut out when I would throttle it up and smoked really bad. Not a single drop of gas flowed out of the overflow tube and it idled OK, so I am relatively certain that the float/needle/seat isn't the problem. But, I continued to investigate this possibility.

 

Removed both carbs and switched floats, needles, and seats. Basically swapping the guts between the two carbs. So now the left carb has the needle, seat, and floats from the right carb. I figured that if the problem was with any of these components the problem would switch to the left cylinder.

Results: It ran exacly the same as before. The right side continued to be the problem. So this eliminates the floats, needle, and seat as my problem.

 

Next, I swapped carbs again. I did not open them up again. I just put the right carb on the left cylinder and the left carb on the right cylinder. I put caps over the choke tube holes.

Results: Now the left cylinder was acting up. It immediately fouled a plug. So I replaced the plug and started it back up. Again, it idled OK, but when I got on the throttle, the left side would cut out and smoke like a chimney. Since the problem switched cylinders when I switched carbs, I feel that this eliminates any possible problems with the top end.

 

Anybody got a cheap set of stock carbs?

[SuperChris]

If you'd like, I can send you my spare right carb to try out.

[applpro]

I spent some more time trying to figure this out last night.  I am now totally convinced that there is something wrong with the right carb.  I just can't figure it out.  I have now begun the search for another set of carbs.  Here is what I did last night, and the results.

 

Cleaned right carb again.  Removed needle and seat.  Inspected seat seal, seat, and needle.  Everything looked good, so I cleaned them again and reinstalled the carb, making sure that the choke tube was installed properly. 

Results:  It ran the same.  Idled OK, but right side cut out when I would throttle it up and smoked really bad.  Not a single drop of gas flowed out of the overflow tube and it idled OK, so I am relatively certain that the float/needle/seat isn't the problem.  But, I continued to investigate this possibility.

 

Removed both carbs and switched floats, needles, and seats.  Basically swapping the guts between the two carbs.  So now the left carb has the needle, seat, and floats from the right carb.  I figured that if the problem was with any of these components the problem would switch to the left cylinder.

Results:  It ran exacly the same as before.  The right side continued to be the problem.  So this eliminates the floats, needle, and seat as my problem.

 

Next, I swapped carbs again.  I did not open them up again.  I just put the right carb on the left cylinder and the left carb on the right cylinder.  I put caps over the choke tube holes.

Results:  Now the left cylinder was acting up.  It immediately fouled a plug.  So I replaced the plug and started it back up.  Again, it idled OK, but when I got on the throttle, the left side would cut out and smoke like a chimney.  Since the problem switched cylinders when I switched carbs, I feel that this eliminates any possible problems with the top end. 

 

Anybody got a cheap set of stock carbs?

316199[/snapback]

 

You can get stock carbs off E-bay cheap. They are for sale all the time

[mat]

First of all, SuperChris, thanks for the offer, that was very generous. But I was able to buy a set of stock carbs from an HQ member for a good price.

 

Secondly I wanted to follow up with the solution to my problem.

 

I took the right carb that I bought, cleaned it up and installed the jets from my old carb. I used the needle and slide from the purchased carb and installed it on my Banshee. Problem was solved. It once again ran like a raped ape!

What is the problem with my old carb? That I don't know. I swaped out the guts and it still caused problems. The only thing that I can think of is that there is a hairline crack in the casting or some type of damage to the area where the needle drops in above the main jet. At this point in time, I don't care. I'm going riding. As soon as the rain stops, anyway.

[SuperChris]

No problem, I've been there. Glad to hear you are riding again. Next 170 bucks you have laying around, look up KX100 carbs from World of Powersports. You'll love that.