Scooter Carburetor Adjustment




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abel berenguer: Tks four you great video, I have a scooter two stroke 50cc sym fiddle from 1999 the moment the petrol not came out from the tank to carburettor I by a new fuel vacuum pump because I thing is the problem, anyway I fit the new vacuum pump and still not came petrol out what you recommend to check first tank you best regards: Vinnie Berenguer

Lost N Musik: Very Helpful Video. I am just getting me feet wet on a new Roketa 250 54B liquid cooled that wouldn't start right out of the crate. Battery was charged, fluids checked and fuel added to the tank. There was zero Vacuum to the fuel pump. After watching this and 1 other video about the source of the needed vacuum to run the pump, (intake manifold port) I suspect to find the vac. hose to runs everything vacuum related probably was never connected to the port on the intake manifold. Great job with the video by the way and thanks for the valuable information. With any luck, the loose dogs will be chasing me down a country road before long..... 

Wooshvooshboosh: I have a 49cc Zhongneng scooter that was given to me by a friend, it runs at a max speed of 30-35, He told me I could replace or modify the carburetor to bring it up to a ~55 mph max speed. I cannot find the model of the scooter, so I believe its a knock-off, but it has the exact same carburetor as the scooter in this video. It actually looks quite similar in terms of air filter and engine to yours as well. What do you suggest I replace the carburetor jets or entire carburetor with?

John Lefkowski: I have a gmi-106 i don't know what the name for it is, i just got it off a website for scooter parts. but i have replaced the starter relay and the ignition coil. and whenever i try to start it, it just clicks. whenever i press the starter it clicks. what would recommend to try and fix it

willythewave: Your video and advice is helpfull anyways. Thank you for replying. :)

rathi bond: About 2 1/2. I would check the jet size and valves also. Thanks

LieutKusa: Hi Rathi Bond, I don't know if it's correct asking you this, but i'm hoping you might have some idea as I am at a loss of where else to look. I am not seeing solutions on my specific problem. Reason I say that is because I have a 49cc Jonway scooter and have been trying to follow based off this.I already cleaned out the carburetor pin and reattached it. However, gas is leaking out but not from the carb. It's come out of the air filter. Either it's on wrong but I put back how it came off...

Dana Weston: i ride a 50cc taotao with a bigbore kit on it to 80cc. i know its something between the piston valves and the carburetor. im just a slow learner with this stuff

rathi bond: First check the valve adj. Then check the jets in the carb and make sure all the hoses are connected and there are no cracks in them. Make sure the air box is connected to the carb correctly. I got videos on how to do all this stuff. Let me after you have done all this if it still has a problem. Does it start good? Will it idle? How many KM does the bike have on it?

Michael Malachowski: Thanks for your help, I replaced the gear oil today (of course it was black) and then after a few tries the engine started, but only for a few seconds. I was able to start it again and got it running for over 30 seconds. However the carb kept flooding, so I took it apart again, last time I was unable to unscrew the float but this time I forced it and found that the floater needle valve was covered in old gasoline that kept it from moving with the floats, but...... while working in my driveway, I

Michael Malachowski: plug is getting wet. I feel air coming out of the exhaust when I crank it. The battery is pretty bad, but I've been using a battery charger with 60 amp crank assist and the starter motor cranks the engine, the battery is trickle charging right now, I'll try it again when its fully charged (Assuming its not damaged). I checked the petrooster and its connected properly and not clogged. I tried this test with about a half a liter of fuel in the tank, but the fuel meter shows the tank is empty. However

Michael Malachowski: I was unable to clean the pilot jet, the wire just wouldnt go through so I assumed the hole was just too small, but I couldnt see light through it. Also, after revving the engine for a few minutes to keep it running, After it dies I can see some kind of fumes coming from it, is this normal? the cylinder head cover is warm but not too hot to touch... I'll let you know if the new parts do anything when they get here.

LieutKusa: I believe you were right it was an air leak. I had it readjusted and nothing leaks now. But now the scooter turns on but it only stays on for about 10-15 seconds. So I have no idea why it is not staying on! Have to say it kinda sucks...

Michael Malachowski: I adjusted the valves and it still wont start, I did however notice that when I manually moved the piston by turning the fan, if I stopped and held it in a certain position, I heard a hissing sound for a few seconds. Could this be pressure forming and a damaged gasket leaking?

Michael Malachowski: I ordered the carb rebuild kit. I made my own clip for the floater needle valve and it looks like it functions fine, and the carb stopped flooding, but I can only start the engine if I spray some starter fluid in, and it only keeps running if I keep revving the throttle. If I leave the throttle in any position it dies in a few seconds. I adjusted the the air/fuel ratio to every position and none works. When I cleaned the carb, the main jet was blocked but I could stick in wire to clean it, but

willythewave: What jet sizes do you recomend with the 100cc kit installed?

rathi bond: Sorry man I have not messed with the 100cc kit.

Michael Malachowski: I recently got a motorcycle like this used and its been sitting in my garage untouched for a year and I just got around to fixing it. I can get it to crank but it wont start. The spark plug works. Should there be a hose attached to that tiny tube sticking out of the metal end of the carb drain hose? or is that for air? Also, I do not have a hose attached to the small outlet on the big exhaust tube, where should that attach to?

rathi bond: How many kM has it been since the valve ADJ? I would check that again. On the taotaos It is very common to get a air leak in between the "air box" and the carburetor. I always assemble the cab and air box together before I put them on the bike so I know that it has a good seal. I would start with that and let me know if it does not fix it. GL

Fabian Quintero: Hi ! My scooter has a problem ! It starts all good but when i give it gas (throttle) it doesn't move with me on it but when i put it on the two stands and give it gas the wheel turns .... Any idea on what it is ?

rathi bond: Ya it really sounds like you need to replace the pilot jet. Were are the fumes coming from? I would say the only place that fumes should come from would be the exhaust pipe. Also be sure to have the fan cover and air flow guide over the head. This is how the engine cools itself. Is just a few plastic covers that guide air. Ill bet that a new pilot jet and carb rebuild kil will get it going. good luck.

Michael Malachowski: Sorry, this is the first engine I've ever worked on. Yesterday I drained all the old gas, followed your instructions and cleaned out the carb (it was filled with brown residue), I cleaned the main jet but I couldnt get the pilot jet out. What I mistook for the exhaust is the air intake. The big black tube has a smaller tube coming off of it but it doesnt go anywhere. I found a hose in my garage and it fits in that hole but I dont know where to connect it. The carb is getting fuel and the spark

Tobie Arundell: Hi, my SYM JET 4 50CC IS NOT GOING FASTER THAN ABOUT 10MPH, Do you know why this could be?

Sumrack9: buy*

yamaha386: What is the air/fuel mixture set at??

Michael Malachowski: So far, I know fuels getting to the carb, Im getting spark, I have a correct spark gap, I have a brand new battery, I adjusted the valves (they were originally screwed all the way down), the fuel petrooster is clear, and the intake manifold is not cracked and is clear. When I put my finger on the spark plug hole, I feel some compression, but I have no idea if its enough, I'll get a compression tester tomorrow. If it is indeed a damaged gasket, do you know a good website to buy a new one?

ronald ferreira: 1 its a junk 2 you need to drill the restricter where the muffler comes out of the engine at the bottom under the moped. its tiny enough a pencil wont go through. 3 use no more then an ounce seafome in a full tank or youll ruin the moped. one ounce is not one can this will clean the exaust from the mufler

Michael Malachowski: Turns out it was the pilot jet, the thing was clogged and it took a drill to get it open. I dont know what the original hole was, but its a 35 now! With the pilot jet open it idles great and I got to ride it around a little. The only thing is if I accelerate too fast the engine bogs down, I assume this is normal for a tiny 50cc chinese scooter? Also, the engine rpms are highest at about 90% throttle, they go down when I do 100% throttle, could this be a problem? is it the restrictor kicking in?

Yvette Victorino: vaccum hose set up

rathi bond: Ya the boging at full thotle I would check my valves if you have not done that and maybe mess around with the size of my main jet. And ya I would check for a restitor washer inbetween the variator belt plates. You will need to remove the belt cover and use a impact rench of some sort to get to it. There are some speshalty tools you can use aswell if you dont have a impact gun. Good luck man

rathi bond: Ok so we know that you are getting fuel and spark. If your sure that your jets are clean ( you can see sunlight though them) I would check your valves. I have a vid on that. Also if you havce a compreshion test guage I would check that. Proper timing, compreshion, fuel, spark, it should start. As far as the small hose on the air intake that usaly hooks to the top right corner of the valve cover. You can see it in my value adj vid. But I dont think that is the problem. GL Keep me posted

bellevernon15012: I just bought a new carb formy 1984 Honda spree and it works fine but I need to fine tune the thing . I got the idel fine but that oil adjusting screw I know nothing about how t tune it. any tips

rathi bond: So when you say "does not stay on" does it just die out? Do you need to hold the throdle and keep the rpms up? If so this is a air fuel mixture. usaly to ritch. I would start buy checking the jets. If its a 49cc you are going to want a pilot jet around 32-34. Sorry it took me so long to respond, had busy few days. Let me know how this goes.

Sumrack9: and a million years later, you have successfully adjusted your carburetor, congratulations! Why bother that thing.. I only screw ONE!! thing out on my yamaha, while everything (carburetor, hoses, clamps ...) remains on the scooter, to get to the main jet. ONE THING! Not the whole freaking system

rathi bond: I alway use "scrapydogscooter". They should have what you need. I think you checked the jets also right. You should have a 70-80 main jet and a 32 is pilot jet.

Thomas Baduria: Thank u brother very informative . Here in indy no help at all .

Michael Malachowski: I took out the fuel measuring float and moved it by hand and the fuel gauge worked correctly, should I fill up the tank more or is half a liter enough, I dont want to fill it up and then waste time draining it if it doesn't work. Thank you so much for your help, if all else fails I will take it to a mechanic friend of mine and see if he can fix it...

rathi bond: Ya new carbs are cheep. you can also get a carb rebuild kit for about $10. Also sounds like your a biit lean on the start. May want to order a few pilot jets aswell. Maybe try a 32 and a 35. I found that a 32 seems to be really nice for 45cc. I also have tried 40 but thats to rich.

LieutKusa: No problem I keep an eye out for your answer! Thank you so much this is bar FAR the most helpful anyone has ever been. And yep I have to hold the throttle to keep the rpms up. I will do some digging on even how to go about this pilot jet thing. =)

rathi bond: Ok, For the carborator drain if your not getting fuel all over the floor then its fine. Some carbs will have right next to the drain a small little piece of aluminum right next to it but it is not part of the drain (it just looks like it). Also there is a carburator overflow but if your not getting fuel on the floor when you crank it does not tell us anything. not sure what you mean buy exhaust tube. The carb will atatch to the intake manifold and the air intake box.

rathi bond: Is that a 2 stroke? I no almost nothing about 2 stroke bikes. Manly just mess it the china bikes? Not sure what a "Oil adjusting screw is"?

rathi bond: ran out of room on that last post. Im going to guess you are talking about the hose that connects to the intake manifold and that goes to the petrooster (fuel valve). With out this hooked up you will not get any fuel in the carb. hopes this helps and thanks for walching. feel free to ask any more questions.

rathi bond: The pilot jet is inside the carb. Just watch this video and It will show you how to remove and check your jet. Also may want to check your cam adjustments. I have a video on that also. You can see the jets in this video at 4:20. Let me know after you check this stuff. Also check your air mixture screw ( mentioned in the video).

Michael Malachowski: lost the little clip that held the floater to the valve....... I will look for it when the sun is out, but I think I will just buy a new carburetor, considering the current one is going to fall apart soon anyway.

rathi bond: About how much gas are you getting? If it is jetted wrong you could get a small amount of gas coming out of the oil filter. Also if you have a air leak some were in between the air filter and the carb you could get some gas coming out of the air filter area? Does the bike start and run? If not then you may have the gas line hooked up to the wrong spot.

Jake Spencer: Great video helped me alot

Dana Weston: over time they need to be maintained, understood... as the system "loosens" up over time. what things exactly need to be done. I get the piston valves must be adjusted using the feeler gauge, but do i just screw the jets in the carb to a certain point to "adjust" the carburetor, or is it a complete replacement of the jets. i do realize i could need bigger jets to allow more fuel through the system, but what makes this seizure in the rate of the idle, what exactly do i do to fix this?

Dummy Box: my carburetor was flooding 150cc. it was the main jet gasket. it was cracked.

Michael Malachowski: Or is it the main jet being too small? Thanks for all of your help, I would have probably just sent it to a mechanic if it wasnt for your help!

Diego Mendoza: por favor traduscanlo al español!1
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