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Yz450f 2015 intermittent issue help needed

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Here are the symptoms

motor shuts-off ramdomly on Landings then reignites 

motor weak on bottom end but normal at peak

motor sound like muffler packing is burnt at bottom, ok on top

i cleaned the pickup coil to spark plug electrical connections and changes the plug for good measure 

It worked ok in the beginning but at 35 min it start to get worst until it shuts of on Landings and then  re-ignites

other symptoms re-appeared 

needless to say i am scared of running it again until i Know what it is

can someone Help me with diagnostic?

I ordered a new set of wires to the pickup coil since the connection is not tigth

 

Tks in advance 

 

 

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Was listening to a podcast from the guy the other day https://www.keeferinctesting.com/ and mentions during this cast that one issue with these bikes is having plug wires come loose. Might want to give that a check, the easy stuff first......

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Yes absolutely correct,250 have been reported with this issue and the fix is  a braket bolting to the head cover,holding down the spark plug cap.on the 450 ,this is less of a problem however i checked the cap each time to make sure it was properly engaged and it was ok.the only time i had an issue with the cap is from pressure washer.if you stay too long too close between the tank and the frame on the rigth hand side,it may partially dîs engage.

 

i would like to know if the coil before the plus can fail? If yes how to Check it? 

 

Thanks for tour help 

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