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Troubleshooting > Failures par brand > FOSTI > FOSTI F51 > My FOSTI F51 50 motorcycle does not start

My FOSTI F50 51 box FOSTI cc motorcycle won't start

The reason your FOSTI 51 50 won't start could be a dead battery, damaged spark plugs, dust clogging the carburetor or air or even poor quality fuel. In any case, proper maintenance of your motorcycle allows you to minimize the chances of this actually happening.

ma  derbi don't start - battery

Checking the battery of your FOSTI F51 50

To check, examine the level of the horn or lights, if you have less than force in sound and lighting than usual is that the Battery is involved.

Check the condition of the connectors and the battery. Inspect the condition and tightness of the cables at the starter motor and the battery.

A problem starting your FOSTI F51 may be related to fouling or corrosion of the terminals. Clean the terminals with a wire brush and check the various contactors and fuses.

Check the charge level of your battery using the intensity of your headlight. A headlight that does not turn on is synonymous with a dead battery. It is then necessary to recharge it with a sacred clothe specific charger.

Checking the spark plug of your FOSTI F51 50

Si the spark plug of your mécaboîte FOSTI F51 50 is damaged, your motorcycle will not start. In this case, you must replace it. Before fitting a new one, remove the one currently on your machine to choose the correct reference (the model is always written on it, regardless of the spark plug brand). Clean the connectors during the change. It's a simple operation to perform

Find the codification of the different candles as well as Equivalences according to brands directly on our site.

Go for a candle NGK ou Champion in order to obtain the best possible performance.

ma  derbi do not start - candle
ma  derbi does not start - carbu

Checking the carburettor of your FOSTI F51 50

There may be dirt in your carburetor, this is a fairly common occurrence that prevents your machine from starting.

You can also get closer to a two-wheeler professional which can pass your carburetor through an ultrasonic machine in order to clean it perfectly.

If the fuel of your FOSTI F51 is too dirty or damaged it is best to replace it completely. Discover our entire range of carburetors for box.

Checking the gasoline of your FOSTI F51 50

Un bad fuel or the fact that water may have entered the tank may possibly prevent the motorcycle from starting.

Checking if the gasoline is mixed with water is a simple task, you just need to remove a small amount from the deposit and see if there are any small ones. bubbles, indicating that the water has indeed reached the fuel.

In this case it is recommended to drain your FOSTI F51 and put in new gasoline. You can follow our tutorials in order to carry out the emptying of your 50 motorcycle.

ma  derbi do not start - gasoline
ma  derbi do not start - air filter

Checking the air filter of your FOSTI 51 50

The fact that the air filter of your FOSTI 51 50 is dirty may be another reason why your motorcycle does not start.

The function of this part is to ensure that only clean air enters the engine. If it receives dust, sand or other elements, it could disturb the start-up.

On a FOSTI F51 removing the air cleaner is fairly simple (as on most canned 50ccs), just remove a fairing. Then run the filter through a blower or under water (wait for it to dry) then reinstall it. If it is cracked, replace your air filter.

You can follow our detailed guide "PAN RESOLUTIONNES" if your FOSTI F51 50 still does not start.

To avoid unpleasant surprises, regularly check the condition of your battery and the spark plug as well as the cleanliness of the air filter. The failure of one of these three points can, combined with the cold, complicate or even make it impossible to start the motorcycle. Also remember to use a more fluid oil in winter, itar it thickens under the effect of the cold.


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