My 250cc dirt bike sparks on and off, dont no why it does not spark constantly?

helo, i have a 250cc dirt bike which has spark from time to time, for example i check for spark by placing the spark plug on the engine and pressing the electric start button to see if theres any spark and after a few times there is spark then after a afew times there isnt any spark which is driving me crazy i dont no why it does not spark constantly does any one have any ideas, it will be greatly appreciated

cheers

YOU put less fuel in the tank? If no
Open and clean the silencer.
Clean the sponge(muffler)

cuz its fake and dogie Report It

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