2-50cc Scooter/Moped Carb Theory And Common Carb Problems




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Did this video help you?

POLO tv: I'm having problems with mine too but it's not this. If yall have time please check out the video I just posted on my channel about my scooter not running right and see if yall know what's wrong with it. THANKS!

Taylor Ray: hi, I got my son a moped, 50cc jet sym - I'm clueless with all things mechanical - when he revs it after stopping it's still going? any ideas please

gonjastar: what should I do with the vaccum inlet on the carb that goes to intake manifoldif the auto petrooster was replaced with a manual petrooster?

MrLonlywolf25: im trying to find out whats wrong with my gy6 4stroke moped when runing it idles ok but when i give it throdle it revs up and down 

Christoffer Pritchett: You need to let it warm up for say 5 mins to make sure the autochoke/enricher is warmed up. At that point, with the suspicion of an unclogged carburetor and jets, you would want to adjust your fuel mixture screw. Too far either way will make it bog. Find the center position. You do want it to run on the rich side as it keeps the engine cooler. Quick throttle turns while adjusting the screw will help you find the engines happy place. It will be where the engine's idle is at the highest and turning the throttle does not exhibit any bogging or choking. You may need to do a few test runs under load to make sure you have it perfect. This should all be done with a cleaned carb! With small engines atmospheric or elevation changes greatly affect your carburetors performance. I would retune the fuel/air mixture every 6 months as far as seasons are concerned. Remember to reset the idle screw after tuning the mixture screw :) Always use the highest octane gas that is offered!!!

Lebmob: Hi DIO, hope you can help, I have a 50 cc 2 stroke moped, will only start if I pour fuel into carb, will run for about 2 or 3 minutes + if I keep the rev reasonably high! will die as soon as I let the throttle go! it has an auto choke! any suggestions..?? Cheers

Angel Sun: I have a 205cc briggs and Stratton OHV system with a belt drive, (1 belt) from the motor to the rear tire. When I start the engine all is fine it starts right up, but when I give it throttle to start moving i drives very slow like 3 -5mph and it makes a squeeling sound I have to push the bike along by kicking the ground like skatebording to get momentum when i do it gets going better but incresed throttle makes squeeling sounds and the bike never gets past like 10-15 mph it loses power. so I end up turning it of and pushing it back home, do you have any ideas as to what is wrong this has been hindering my progress for 6 months now

Henry Tripp: Really don't need the life story or a blow by blow of your drinking.

William Walters: I am having a problem like this. Basically it almost never starts and when it does it is fine. If I don't hold the throttle open it seems to make a grinding noise like it isn't getting enough cranking amps. I have taken it to a scooter person and I told them it doesn't seem to want to start and I wanted them to look over it and fix the issue. Also I wanted them to see if they can give it a little more speed and ability to go up hills without slowing down. Well they did that and it worked fine for awhile but eventually stopped wanting to start after a few attempts. I really think it may be the auto choke do you think this may be the issue as well?

Goran Milanovski: I have an issue with my 80cc 4tact scooter, when im driving it it feels like im changing gears, it doesent just go like you gave a full trotile and go right? well its not it acelerates and for a second it stops and then again acelerates its like a pause between start , middle and full gas , can you help me with this one?

nathan hofschulte: 8000hp? holy crap 

abel berenguer: Hi Dios tks again four you all videos you been post, I have a Chinnes scooter Sym Fiddle version 1 from 1999 my question is- is ok to use same pipe size from the petcoke " vacuum pump" four the vacuum and petrol tank you have a great Christmas and Happy new year four you and you family best regards: BERENGUER

sam240se: your time for making this video is well appreciated. by the way i felt you were talking to me cause my name is sam too. thanks for your help.

trevgoodchild: Cool video man, thanks for sharing.

mrfayetteville91: 8000hp Hemi? I dont get it

DIOSpeedDemon: @THe808KiNGX Sounds like you need a new drive belt and check your whole drive belt system for a start.

crazydriverboy: When i rev my speedfight 2(50cc) it takes about 3 seconds for it to start moving and it takes a while to but when it does reach 10mph the acceleration speeds up by alot, i was thinking the clutch springs were too hard and that they made the clutch engage at high RPM's but wouldnt that increase the acceleration a bit quicker than when i reach 10 mph? the scooter is restricted btw, please help!!

Kelly Burton: how do i fit fuel pipes on a piaggio zip 50 2t with a 19mm jog carburettor please regards kelly

keyskennels: and i also have a 50cc chinese scooter. the motoer is brand new, but thw starter pinion wont catch the drive face. it just spins. please help me out

xNOSKOP3: I have a piaggio Zip 2 Stroke and i had a problem where i had to hold the throttle to keep it from cutting out and also wont go past 30mph i used to get 55 my spark plug was dry and a mechanic said it should be wet from petrol but im unsure if this is the problem or what the problem is im unsure why it wont go past 30 i know i need new performance rollers but im sure that isnt stopping the performance as it was fine before any suggestions ?

londonTown1989: these videos are amazing they help so much and i bet u have saved ppl so much money thanks for sharing all these videos

DIOSpeedDemon: A racing variator will give you about 5 mph more speed and can be bought at Vtcycles. check my home page for their website, thanks.

NucIearChrist: i have a chinese 49cc scooter. 4 storke

Robin Bigun: @DIOSpeedDemon I have the same problem! I will clean the jet! thanks

hammerhead042: What I'm going to check tomorrow is the cvt drive belt because I noticed that some bolts were not all the way tight so I'm lead to believe it has been tampered with before. If the belt or clutch is not the case does anyone have any suggestions on what may cause that engine to scream out of control and see no movement in the tire?

DIOSpeedDemon: I cant hear anything on this video, sorry.

dammstr1991: as soon as i pour gas into my gas tank the gas starts pouring rite out what can be the problem?

DIOSpeedDemon: @Sabbador Look around the head for any oil or gas leaks. This will show a bad head gasket. It is imperative to change the head gasket after every tear down. Go to a motorcycle shop, order a new gasket or three, for spares, and change that used head gasket for starters. Get a new spark plug while you are at it. SOunds like a blown head gasket to me. RH

delamsam2: my 70cc scooter engine cuts out when i twist the throttle more then half way any idea what the problem could be ? thanks

Insanecoment: I need help! I have a Yamaha BWS Scooter, and when starts it and starts drivin it leaks a lott of gass! I noticed this to day... I saw a stripe of gass from where i was drivin... Pleas help!

gelgoorx: my honda 50 elite sr starts up great but i cant seem to get past 33 flat road and 35 downhill plus the take off is slower than when i first got it help :(

DIOSpeedDemon: a Maine turns on carburettor four the air screw ? How many turns the air screw must go in? No more than 2- 2 and 1/2. Any more and you will have to change your idle jet to the next largest size. THanks for the kind words. RH DSD

Sabbador: @Sabbador (continueing my other comment) What do you think could be wrong? Hope you can help. The carb should be working fine, but maybe it's the menbrane again? It also as significant start problems. When kick starting i need to kick 15 - 30 times lol. It's only a few years old and has run 13.000 KM.

mechaniczman64: TO: jalesj03 you might not have enough gas in your tank make sure your choke iworking right when it starts to die unchoke it

jon phillips: what does mopped mean?

angel archilla: I have a Yamaha 50cc and I can hit top speed it will go up to 10mph the u can hear it fail on me but if u keep on it u here a pop of air from the exhaust side

DIOSpeedDemon: First you need to bring it to my house and let me Check It Out.. Seriously, I have many videos on the subjects you ask. Thank you. RH

abel berenguer: You need to cleane your carburetor

mattsteam12: Hi. My 50cc 4 stroke is fine when its going along but when i stop it just cuts out. Also if you blip the throttle then let go it still revs even though i dont have my hand on the throttle. Do you know why? Cheers

Insanecoment: That have happand to me before... I dont know why but sudently it stopped

abel berenguer: Hi Mr. Dio tks 4 your great videos I like to see all your videos because is amazing, just a question I have a Sym Fiddle version 1 from 1999 is two stroke engine whit 75cc naraku cylinder, my question is - a Maine turns on carburettor four the air screw tank you very much BERENGUER

Brad Batchelor: i have a vento zip. im loosing power going uphill and on semi grade hills when the speed reaches 30 mph it takes off and cruzes fine . its just with the lower end speeds. its a 2 stroke. it used to do fine . any help would b great. thanks

DIOSpeedDemon: Sounds like a clogged main jet, which is very common from a bike that has sit for a long time. Clean the jet and replace, then fire up. RH DSD

Bunks Medina: can you help me sir? i have idle problems too... my scooter wont stop... it wont go idle at all.... the wheel just keeps on running.. what seems to be the problem?

Lewis Roper: i have a problem with my Aprilia SR50 R Factory. when i pull off it's really slow and then picks up. i thought i could be the throttle cable but now i think it's either the drive belt or the clutch. any ideas

Robert Kincaid: I have a Honda XR50R and after a crash, where it slid sideways across the backyard, it started leaking oil at first, then straight gas from the air filter box directly behind the carb. Any ideas what's wrong with it? And how to fix?

THe808KiNGX: really need ur help i got a sym dd50 every time i start it and take it for a ride while bulling back the throttle it goes faster and faster then bugs out and starts to have lower acceleration can u help find whats wrong?

Matthew Poole: I have a 50cc V.I.P moped and i can crank it up but it will run for about 2 min and then cut off. by itself and then when i try to drive it i fully throttle it then it slows down and cuts off i cant even get 20 feet. wht the HECK is going on with it?

Mark Davis: My vento 150cc gy6 motor will not stay on. It run for 2 sec. then stop. Could this be the carb jets?

meech78: A Hemi has 8 thousand horse power? (3:27)
Rating:
2-50cc Scooter/Moped Carb Theory and Common Carb Problems 4.7 out of 5

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2-50cc Scooter/Moped Carb Theory and Common Carb Problems