Children's ATVs, like models for adult drivers, are used in busy conditions. Therefore, it is not uncommon for breakdowns to occur. If a children's ATV does not start, there may be several reasons. You can contact a car service or try to solve the problem yourself. To find the reason why the children's ATV does not start, diagnostics are carried out. If the problem is minor, it is quite possible to fix it yourself. Reliable, durable ATVs for children are sold in our Dvako motorcycle salon dvako.com.ua/kvadrocikly/detskie. We sell motorcycles from well-known manufacturers at low prices.
Common causes of malfunction
If a children's gasoline ATV does not start or starts and stalls, this may be due to improper operation of the four-wheeler. Frequent breakdowns in this case are:
- breakdown in the fuel supply system;
- the switch has failed;
- starter is broken;
- the battery does not hold a charge;
- problems in the ignition system.
To find out why a children's gasoline ATV does not start, equipment with a battery needs to start by checking the level of gasoline, oil, and refrigerant. If it is an electric ATV, you need to check the battery performance. If problems appear immediately after changing the engine oil or other fluids, they need to be drained and the system flushed. Perhaps the composition was of poor quality or unsuitable.
Engine idles rough
- Valve clearance is too large or too small: Set the valve clearance correctly according to your motorcycle manual.
- Incorrect setting of the mixture ignition timing: adjust.
- Spark plug sockets or wires are not touching the spark plugs properly: Pull/unscrew the ignition wires, cut them piece by piece, and reinstall/screw them in again.
- Malfunctioning ignition module: You will find if you try how the equipment talks to a properly working module from another motorcycle of the same type; Make sure the ground is properly connected.
- Unsynchronized carburetors: Adjust the carburetors using a vacuum gauge.
- Incorrect idle speed adjustment: adjust.
Starter failure
One of the reasons why a children's ATV will not start may be a broken starter. Perhaps only some of its elements have failed or the electrical contacts have been broken. You need to check the following:
- Contact status. If there are traces of oxidation, you need to clean them and properly connect them to the starter.
- Relay check. If water has entered the assembly through microcracks, there may also be traces of rust. The unit needs to be cleaned or a new component installed.
If the starter works normally, you need to look for a breakdown in other systems.
Engine doesn't work, exhaust gases are blue
- Too high an oil level leads to oil entering the combustion chamber, the crankcase ventilation system transfers drops of oil into the air filter container, from where it is sucked back into the engine: check the oil level with a dipstick or eyelet, clean the air filter.
- Worn cylinders and/or pistons, worn or broken piston rings: measure compression ratio; if it is too low, remove the pistons and piston rings and check the installation dimensions, replace, repair the engine.
- Worn guides or valve stems: disassemble the cylinder heads, check the installation dimensions of the valves and guides; replace them if necessary. Install new valve stem seals.
Spark plug
If your 49cc 2t kids ATV won't start, the problem may be with the spark plug. You need to remove this component of the ignition system and inspect it. If there is visible damage, the spark plug needs to be replaced. Sometimes there are no external signs of failure, but the part still turns out to be faulty. To check its operation, you need to perform a few simple steps:
- The candle is first cleaned of dirt.
- Surfaces are wiped dry.
- After cleaning, you need to inspect the spark plug again.
The standard ignition system component is brownish in color. If it has black carbon deposits or, conversely, is almost white, this indicates that the air-to-gasoline ratio is incorrectly adjusted. It is necessary to correctly configure the fuel mixture supply system.
You need to check if there is a spark at the spark plug. It needs to be placed in the cap and touched to the metal part. There should be no paint or varnish on the surface. If the spark plug is working properly, a blue spark appears. Otherwise, the component must be replaced.
If you cannot find the cause of the breakdown, you need to contact a service center or service station. Our technicians will conduct a comprehensive diagnostic and quickly find the faulty unit.
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The engine does not work and overheats
- The mixture is too lean due to clogged carburetor nozzles: drain all gasoline from the tank, disassemble the carburetor and clean it, refill with fresh gasoline.
- The mixture is too lean due to incorrectly adjusted carburetors or injectors: adjust the carburetors.
- Carburetor traps left air: Carburetor is not installed correctly/tightened, intake manifolds are cracked or porous.
- Pinched, jammed or kinked fuel line: check its condition along its entire length.
- Oil level too low: add oil as needed.
- Oil pump malfunction or oil circuit clogged: Stop the engine immediately and contact a workshop.
What needs to be done to improve the situation? There is a screw at the bottom of the carburetor that screws in horizontally (the guide can serve as a return pipe with a fitting next to it). This screw must be unscrewed to allow the old gasoline to drain out. The liquid will be cloudy and yellowish. Once it turns into clean gas, the fuel must be drained. To do this, just tighten the screw.
Now you can try to run the quad: most likely there will be no problems. Therefore, before leaving the ATV in the garage for any period of time, you need to drain the gasoline remaining in the carburetor. Upon return, it is filled with fresh fuel, so you can continue driving the ATV with peace of mind.
Source
Fuel system
Poor engine starting may be due to a dirty fuel filter. As you know, there are two such elements in a car. This is a coarse and fine filter. As a rule, the last element is clogged. This happens at a mileage of about 60-90 thousand kilometers. The filter itself is a corrugated paper element with micropores. They are the ones that hold dirty particles. Over the years, these pores become clogged and the pump is no longer able to pump gasoline through the filter. What is the solution to the problem? The solution is obvious - replacing the fuel filter with a new one. This is the only way to guarantee quick and trouble-free engine starting in any conditions.
Among the less common causes of poor starting, experts highlight contamination of injectors (applies to diesel engines) and injectors. In this case, replacement will be expensive, so many owners prefer ultrasonic cleaning of these elements. But this is done only at specialized service stations.
Morning imbalance or difficulty starting the Renault Logan engine in the morning: possible reasons
Not only crankshaft position and coolant temperature sensors are at risk. A jammed idle speed control also affects the way the engine starts: the power plant does not start without lightly pressing the gas pedal. Appears both cold and hot. It is treated by replacing the IAC with a known good unit.
Insufficient pressure in the fuel rail
Sometimes Renault Logan has difficulty starting in the morning due to a malfunction of the fuel pressure regulator. Relevant for both versions 1.4 and modifications 1.6. Diagnostic measures will help verify this fact, the essence of which is to measure the pressure in the ramp.
How to check
From the equipment you will need a special pressure gauge with fittings, a small piece of wire (7-10 cm) and a puller for influencing the pipeline tip clamp. The diagnostic technique consists of several points:
- Relieve pressure in the fuel system (turn off the power to the fuel pump by removing the block and start the engine).
- Disconnect the fuel line from the rail.
- Connect the pressure gauge.
- Remove relay K5 (Logan phase 1) or Er3 (Logan phase 2) - located under the hood.
- Bridging the power contacts of the platform under the relay with a piece of wire.
- Turn on the ignition (return the fuel pump power supply block to its place).
- Record the readings on the pressure gauge.
- Turn off the ignition.
- Observe the change in the position of the arrow of the pressure fixation device.
- Remove the pressure gauge and a piece of wire, restore the original state of the gasoline supply circuit and the power supply to the gasoline pump.
A pressure of 3.5 atmospheres when the fuel pump is turned on indicates the serviceability of the check valve. If lower, replacement is inevitable. When the power is turned off, the needle may deviate towards lower readings by no more than 0.7 atmospheres.
What to change for
Starting from model year 2007, the fuel pressure regulator is integrated into the fuel pump module. There is no need to change the assembled equipment, as recommended by the official dealer - the check valve is completely interchangeable with a VAZ part of identical purpose, containing the numbers 380 in the marking (intended for Lada with a 1.6 16V engine). The issue of interchangeability is not as important as the choice of brake fluid for Renault Logan that meets the factory requirements.
The difference between the “renowned” original and the VAZ product is in the calibration of the limit pressure that determines the operation of the drain valve. The standard version opens when it reaches just over 3.5 atmospheres, the VAZ version - at 3.8 atmospheres. There is nothing critical about this.
You can also supply an original part, if it were not for the price issue. The original for Logan will cost 2,200 rubles, and the RDT, say, for Priora costs about 400 rubles.
What else
The peculiarity of the main causes is that they are identified by simple diagnostics. Subsequent defects are difficult to identify due to their ambiguous symptoms. For example, it is not easy to calculate the incorrect operation of the control program of the electronic engine control unit or determine the lack of air at the inlet.
When Renault Logan has trouble starting hot or cold, there is every reason to assume that:
- The injectors are clogged.
- The throttle valve is dirty.
- The “crooked” firmware is installed.
With a reduced working cross section of the injectors, the engine starts successfully on the second or third attempt. Related symptoms help identify the fact: poor throttle response and increased fuel consumption. A critical state of the throttle assembly will result in a sharp release of gas, resulting in instability of the idle speed or even stopping the engine.
