Replacement with JMP plates helped, I used them in the Triumph Rocket III as to the quality I can only say after a longer use so far everything is ok and from the appearance and external treatment looks good probably I would know more if I measured it with a micrometer screw and for example hardness but I did not do this only after putting it on I measured the valve clearances again and checked that they met my initial assumptions . After replacement the motorcycle again runs quietly and ignites without any problem on the shot greetings
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Reliable opinion
JMP - Motorcycle valve plates - adjustable to the most popular motorcycles