KymcoForum.com
Scooters - 50cc => Super 9 => Topic started by: stljimmy on June 06, 2012, 01:26:50 AM
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kymco super 9 running badly (http://www.youtube.com/watch?v=lbJD2vTTnfE#)
What do you think? It is WOT and rolling backwards. I recently changed the plug. Is it too lean?
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Everything looks brand new. What else was done to it? There are too many variables to answer from the Vid.
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It is an 08 with 659km. It has the technigas pipe with the rollers that were supplied with it, open air filter. I filed the main jet to around 93mm or so according to a digital caliper gauge. It also has the boss drive mode. I also put a fuel shutoff valve on it.
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..forget the rollers right now...you gotta get your jetting right first, and THEY AINT RIGHT!!!
..FIRST, GET THE REAR TIRE OFF THE FLOOR...and on the center stand...
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Take the open air filter off and put the stock box back on. Once you get it tuned with the stock box go from there.
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..you see how black that pipe has already burned...
..sure sign that your jetting is too lean, and firing very hot...
..put in a 37-38 pj, and at least a 115-120 main jet...
..i have the same setup as you, pipe and filter, with the exception of my oem carb...
..my 04 carb has a bigger diameter slider and carb intake than yours, and i'm running a 38pj anda a 125 main...
..your scoot is running waaay lean, and i'd advise you not to fire it until you increase jets....
peace
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..you see how black that pipe has already burned...
Wow... You should see the Scorp. Shiny metallic black. Back to the drawing board...
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It also looks like your clutch needs to engage closer to the powerband so that the clutch engages after all that low power/low RPM stuff. Try that CDI, and get your jetting sorted and I'm sure it'll be much better.
Thanks for posting the video!
~Josh
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Wow... You should see the Scorp. Shiny
..reason i said that, was i bought two of those pipes, one for nina and one for christine, the 02 ppl that tried to kill me...
...we set up the ppl first, and it was tending rich...pipe burned a nice cool brown, and still is..
..i was tending waay lean at my first attempts on the s9, and very quicky burned the pipe black, to the piont that it burned all the finish off 5 inches down from exhaust manifold...
..that was when i put the oem pipe back on, and started over with just air filter first...
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The pipe on my people is f'in blue up to the expansion chamber
Kinda looks cool
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...dang...maybe i mis-spoke....
..maybe the ppl wass too-too rich, i'm learning, as this is my first pipe-tuning event...
:o
..my s9 pipe finish burnoff has stopped, tho...since i got my jets right...
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Yeah mine stopped when I got the jetting right
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Thanks for all the help, ordering some jets from Josh
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I bored the main jet out just a few thousands it is in the 95-97mm range. It ran great last year with the jet how it was in the 93-94 range. Another thing when I turn the fuel shutoff valve off it will run for a few minutes at idle before it dies. It will also run good a giving it gas only when the valve is shut off before it dies. Here are some pics of the plug I just pulled this plug has been in it for this year when it has ran badly
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Your flooding it. That is why it runs better before it dies.
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I think you are on the right track zombie. I wonder if somehow I changed the float height pulling off the bowl? Does anybody know what the float height should be set at?
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I have been setting floats to inverted level for ever as a base line guide. You have to keep the spring loaded pin in mind... That has to be extended during adjustment. You may have an issue with your auto choke. If it's not connected, or malfunctioning that would do it. The tip should move at least 4mm when the key is on so I would check that too
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ok, so the jet I took out was around a 102. It was mid 90s before I went up to 102ish. I've been from that all the way down to 86. It almost seems like it is something besides the carb. To try to solve the issue I first put in an aftermarket CDI, which I thought helped. It would run alright for a couple of minutes then struggle to get up a hill from a dead stop. Then I started playing with the jets and still no improvement. Next I put the red 30% clutch springs because I thought the problem was the motor wasn't making any power in the low rpm and bogged it to a rich condition. (It runs worse the longer it is running). This really didnt help either. Today it would barely start and I went from the 86 to the 94 main. Changed the plug also and I got the compression tester loan a tool from autozone. I did a compression test and it was 135psi. I hooked up the air compressor at 5 or 6psi and did a pressure test (spark plug hole)sprayed a lot of soapy water around the base, head and intake gasket (made sure it was BDC). I made a plug for the exhaust and it leaked a little, but no where else and no bubbling. No air came out of the carb and it wasnt plugged up or anything....I just left it on. My dilema now is take it to a shop and have them do a proper vacuum and pressure test and check the scooter out or should I gamble on an aftermarket carb? Is it likely to blow a base/head/intake gasket with 6xx km?
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Gaskets rarely fail. It could be your stator. They will often fail as they get hotter, and run fine for a short while cold. A new carb never hurts either. ;)
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The spark did look weak to me today when I held the plug against the block, it defineatly has spark though.
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Try doing a resistance check on the stator. Test it cold first then ride/run it till it fails, and re test.
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So I took it to Carver's scooter shop in St. Louis. They did a compression test and came up with 90psi and I got 135psi. They also did a leak down and there was no leaks. A few other tests for spark and fuel and their conclusion is the top end. Josh from the scooter garage helped me over the phone(very generous with his time). I just pulled the head and jug and took some pics. It looks in decent shape to me but I am going to at least put a new set of rings on and hone it while it is off. How does it look to you guys? Just rings, piston and rings?
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...woww...they look decent to me...
..rings and a lil honing, i'd say...and clean the top of the piston...
..might even polish it smooth as you can..
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You can still see the cross hatching... Is the top ring stuck? What is the ring end gap? What is the piston clearance?
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After a top end, cdi, jetting, etc it finally runs right ;D The new carb did the trick. I wonder what went wrong with the other carb? There is still a little fine tuning to do on the Mallossi 19mm, but I am going to hold off til winter and enjoy the scoot the rest of the summer. I almost gave up on it, but thanks to everybodys help on here I stuck with it and got it going. Thanks to all for the input :)
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Cool beans...
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What was the "other" carb? Stock?
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What was the "other" carb? Stock?
It was a stock carb with a different main jet. I got the jetting dialed in and it ran good for a few months until the end of last summer when it started runnning badly, then this year it just got progressively worse to the point where it would only start with starting fluid. I cleaned it about 5 times, bought a jet kit, adjusted the float, washered the needle all this year after the problem. Maybe a leaking gasket or a bad seal somewhere?
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I see
IMO I hate the stock carbs. I mean, I know Keihin carbs aren't bad carbs. I'd just have trouble starting all the time and it was nearly impossible to find jets for it. I'd have trouble starting mine if it sat for a week. Now I never have trouble.
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I know Keihin carbs aren't bad carbs. I'd just have trouble starting all the time and it was nearly impossible to find jets for it.
..cant adjust the needle without some redneck mods either...
:-\
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I know Keihin carbs aren't bad carbs. I'd just have trouble starting all the time and it was nearly impossible to find jets for it.
..cant adjust the needle without some redneck mods either...
:-\
Yep!
Don't get me started on that stupid auto choke :D. I think if you can't operate a manual choke then you have no business on 2 wheels. Just sayin.
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Dude you gotta get ahold of me on tuesday, Ill help you get this together. Bobs a good guy but sounds like he did you wrong. That cylinder looks fine. Im out of here for the holiday but ill be back tuesday.
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I agree Bobby is a good guy. I put the new carb on and it ran great til it got in the upper 90s. With the stock carb on there was nothing that I didnt try to get it to run right. They said it had good fuel flow, spark, but low on compression. I wish they would have swapped the carb with the other S9 that was in the shop. I really dont think they intentionally misjudged it to get me to drop $400 on a BBK, it was just a really tricky carb problem that was only solved by a different carb. I probably wont go back though unless I bubble wrap it, because when I brought it in it was mint and when it came out the paint on both sides was minorly scratched. I didnt notice til I got home and I didnt mention it when I had to go back to get missing parts because Im sure it was an honest mistake. I am not being sarcastic, I just think they are too busy to really take the time needed to solve a tricky problem like this scooter had. I appreciate the offer for help but the jet kit is on the way and it should be back to normal again. Its ran great for a couple of weeks now just on a really hot day it will bog pretty bad.
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Hot humid days mean less O2 in the air. You are most likely running rich. ONE jet size down or a hotter plug should get it. Plugs are easier than jets, and do just as much.