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Trying to tune lei motto carburettor on 110cc quad it has 2 screws on carbbie, one is fuel & one is ai as far as I know. Seems to keep fueling plug having to constantly clean plug & play with mixture screws to keep running. Can you help with this problem ?

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The larger screw is the throttle stop and the smaller screw is tickover mixture control. Unscrew the throttle stop and it ticks over slower, unscrew the smaller screw and the mixture has more air on tickover.
Perhaps the float valve is not set up correctly and is letting too high a level of fuel in?
Hope that helps.

Posted on Jan 02, 2011

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I just bought a mud blaster 110cc quad for my son, why does it start then 2 min later stop even with feathering the throttle?


#1 sounds like a fuel delivery system issue. Make sure the fuel tank flows freely to the carb. (remove the fuel line from the carb--from the gas tank and turn on the petcock--gas should flow freely) The needle and seat may need to be cleaned or replaced, this controls the flow of gas into the float bowl of the carb.(remove the drain screw from the bottom of the carb (with everything properly assembled- petcock on)..gas should continually flow through the bottom of the carb --10-15 seconds of continual gas flow will make sure its flowing properly! Both of these sound like a solution to your problem.

Jun 22, 2014 | ATVs

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How to adjust carb settings


Hi Charlie.<br />Operations to be performed depends on how much tuning is needed.<br />Carb setting regulates the ratio between air and fuel in the mixture aspired into the cylinders.Optimal air/fuel ratio is usually around 14(air) to 1(fuel). I illustrated the complete job with cleanup and jet replacement and adjustment. In some situation you do not need to perform complete tuning, which involves taking apart the carburetor. In that case perform basic regulation setup using the two adjustment screws at one side of the carb. Adjustment simple procedure starts from part 2/Adjustment. A good approach is first doing adjustment using idle and thickener screws. Then do the whole tune up if the simple adjustment does not work.<br />The complete tuning is based on carburettor cleanup, regulation of main jet and idle jet and needle setup.<br /><br />Part 1 : Complete tuning and cleanup:<br />1. Take apart the carburettor,<br />2. Undo the float chamber(6 in diag) held by screws (26 in diag).<br />3. Clean bowl with with carb cleaner (put a lot of it in the bow, wait a bit and dispose it-finish the job with a cloth if needed) . Clean floats (nr.4) and other parts using carb cleaner and cloth.<br />4. Use a flat screwdriver to remove the main jet screw (placed in the chamber, held by big golden screw, goes between the floats). Spray the main jet. You must be able to see through it.<br />5. Use the carb cleaner to clean the accelerating pump and all the other parts inside the part. Needle and small parts must be cleaned. Clean the idle jet, which is the smaller golden screws. If you have a compressor blow into the jets (you can blow them even without compressor, but follow H&S).<br />6. If possible replace main and idle jets. Sometimes you may like to replace the jet with a bigger one to get a richer mixture.<br />7. Adjust the needle if needed. A lower needle settings means a richer mixture.<br />8. Remove idle adjustment screw (7) and main adjustment screw(31), clean them screw them back in without tightening and perform part 2. Leave the screws about one and half turn from all way in.<br /><br />Part 2: Tuning and minor cleanup - Here you mainly operate on idle and air (thickener) adjustment screws (8 and 12 in diag)- Start from here, if this does not work, do part one:<br /><br />1) If the engine runs start from idle adjustment: screw or unscrew the idle regulator to adjust the idle speed, the screw is placed to one side of the carburetor and has a spring (part 12).<br />Keep idle least slightly higher than the minimum needed. Example, if the engine stays on slightly below 1000 rpm, set idle to a bit higher with engine revving above 1000 rpm.<br /><br />2) The thickener, placed near that of the minimum screw regulates the air flow. Tighten the screw and unscrew 2 turns from all the way in. Do regulation from this position. <br /><br />Here carburetor diagram and part list. The diagram is taken from service manual. The manual for Lifan 150 (does not include carb setting) has been uploaded here:<br /><br />http://www.mediafire.com/?o3r8x2ujrdbfb6o

on Oct 29, 2011 | 2008 Lifan Delta 250 V Twin

1 Answer

Hey I have a quad with wot I think is a bike engine it has a pz30 carburettor the wen I turn the fuel on it just runs straight out the bottom hose?? Any ideas???


there should be a screw at the bottom of the fuel bowel make sure its in and a rubber washer or some kind of washer is on the stop bolt

Jun 11, 2014 | Motorcycles

1 Answer

Why my car back fires in the motto when accelarating otherwise ok at low peed?


Could be many things...how long since a tune-up? May be bad gasoline...use gas tank fuel injector cleaner (2) bottles STP...could be a clogged catalytic converter...free check at your nearby muffler shop...could be a vacumn leak inspect all rubber lines and connections...most costly could be fuel pressure regulator valve...any fuel leaks? Hope this helps.

Jun 04, 2014 | 1998 Toyota Corolla

1 Answer

Managemylife com


1.You have to remove the air filter *** cover.
2.Remove air filter.
3.Remove 2 screws, to remove the rest of air filter ***.
4.Remove the 2 fuel lines with a long nose plier.(Take a photo of
the position of fuel lines or mark fuel lines for reassembly)
5.Unhook the throttle cable.
Now to fix the Carburettor
1.Remove the 4 screws on primer bulp side of the carburettor.
2.Open the carburettor and clean with paint brush and clean fuel.
3.Replace diaframe kit(available from your nearest dealer) and reassemble the trimmer.

Dec 30, 2013 | Craftsman WeedWacker Gas Trimmer 29cc...

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Air fuel mixture screw adjustment of spaco 17d carburettor


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Jul 01, 2013 | Cars & Trucks

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I have a 2007 Saturn ION, been wonderful so far, I have a little over 90,000 mi on it, now my "check engine" light appears then disappears, I'm getting the p0300 error, something about it misfiring, It...


misfire can be elect or fuel related---possibilities are fuel filter/fuel pump--coil going bad --plug wire going or damaged --plug going-cap cracked aged --check plugs if need replacing give car tune up and change fuel filter w/90,000 its due

Apr 14, 2010 | 2007 Saturn ION-2 Quad Coupe

1 Answer

How and where do you adjust the synch on 1986 gsxr


I can help with this.
On the earliest models they had slide type carburettors. This is to say that the slides were actuated by the throttle cable acting on a linkage that physically lifts the slides in the carburettors. This type of carburettor has its balance(syncronization) adjusters under the caps on top of the carburettors.(the cap isn't round & has 3 screws in it)
Number three carburettor is fixed & dosn't get adjusted.

You'll have to put the bike next to a bench & attatch a long piece of fuel hose from the tank to the fuel hose on the carburettors.You can join the two pipes together using a short piece of hose that snuggly fits on the outside or inside of the two hoses. You can also join them with a suitable shirt piece of metal pipe,or what is called here in Australia a P3 barb.These are available from tool suppliers that supply air compressor hoses & fittings.
(I made a remote tank from an old lawnmower petrol tank,a long piece of hose & mounted it on a tall stand.Under it I have a tray with all my different adaptors in it.)

You adjust number 2 cylinder to the same vacume reading as number 3 cylinder first.
Now adjust number 1 cylinder to the same vacume reading as number 2 cylinder.
Next adjust number 4 cylinder to the same vacume reading as number 3 cylinder.
Recheck that they are all the same & your done.
The adjusters are of the screw & locknut(8mm)type.
You can struggle with an 8 mm ring spanner & a flat bladed screwdriver,buy an adjusting tool(genuine, or non-genuine from a bike shop) or make one.

To make one you weld a bar onto the side(at the top)of an 8mm extended quarter inch drive socket.Then find a long small screwdriver that will fit down the hole.

After you make each adjustment,stop the engine & open the throttle wide open & release a couple of times.(This seats the slide).After diong this re-start the engine & re-check your adjustment.
I place a fan blowing on the engine to help control the engine temperature as the adjustment can be a bit of a fiddle.

I prefer to use mercuary type vacume guages as they dont go out of calibration.

If you are using dial type guages check that they are all reading the same by checking them all one by one on the same cylinder.
Some Suzukis' have a pipe (covered with a black rubber stopper) at the top of each carburettor(at the front) & others have an allen screw on the cylinder in front of the carburettor manifold rubber.
If yours has the allen screw you will also need adaptors that screw into the hole once the allen screw is removed.

If you bike has diaphram type carburettors on it(you'll be able to recognise this by the top caps of the carburettors being black & roundish in shape & held in place by 4 screws), the adjusting screws are between each carburettor & are the spring loaded type.
The adjusters are located in-between each pair of carburettors visable from the top.
These are easier to adjust as there is no lock nut to struggle with & all you need to turn the adjusting screws is a long (flat or phillips)screwdriver.
Again, balance the center two first,then the left pair then the right pair.

This procedure is applicable to all in line 4 cylinder motorcycles (even most fuel injected ones.

Regards Andrew Porrelli

Nov 26, 2009 | 1986 Suzuki GSX-R 750 G

2 Answers

2003 yamaha roadstar leak fuel sometimes after I shut it off I think the floats are sticking any solutions. Rick


Yes Rick, try a couple of tricks I know.First,open the carburettor drain screw located at the base of the carburettor,this lets fuel flow out of the carburettor drain located next to/under it.(To acces this drain screw look between the engine cylinders from the LEFT of the bike)While the fuel is draining out,tap the fuel bowl.Next re-tighten the carby drain screw and see how that goes.I would suspect your bike has a vacumatic fuel tap that has 3 positions on it.1 marked on, 1 marked res, 1 marked pri.If the fuel leaks occur when in the on or res position this means part of your problem is a leaking diaphram in the fuel tap.Replace this & when engine isn't running,no fuel can flow to the carby when it's in the on or reserve positions.After ensuring the tap is ok, and trying the first trick,if it still leaks,well then you'll have to pull off the carby and give the needle and seat a clean.
Hope this healps Regards Andy Porrelli

Nov 23, 2009 | 2003 Yamaha Road Star Silverado

2 Answers

I need to tune the carb on the Suzuki LT50 quad


start the mixture screw at around 1& 3/4 turns
the petcock will need a service!
aswell as flush the fuel tank & a new fuel filter!
as rust scale would be building up in the tank & going through the fuel system!!
Cheers Rob

Aug 16, 2009 | 1972 Suzuki T 350

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