My bike jerks at 6 to 7000 rpm when i drive it

If your standing still in park it wont rev past 3000 rpm as its got a limiter on it And only revs past 3000 rpm in drive on the move.

I would say you just need to bring the revs up on it a bit try pulling away at about 3000 rpm

Check the air inlet tube for small hairline crack TOP AND BOTTOM.

A loss motor mount can crack the air inlet tube.

This will allow more or less air into the intake at different rpm range.

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your bike had electrical problems in magnet coil

so i drove my bike sputtering to school and notice that there werent problems with the fuel system cause i heard the engine drowning in the fuel cause the ignition system couldnt explode it by a to weak spark from the spark plugs, so i only had to change the spark plugs and everything was good as normal

sorry if my story writings look a bit weird, cause i dont speak or write english where i live

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It sounds like the primary drive chain is loose. The way I adjust mine is to take off the upper left inspection cover, start the bike and slowly tighten the adjuster until it starts to wine, then back off until it stops. Rev it slowly and listen for a wine. No wine good to go.