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Montesa 4Rt Reduced Engine Braking

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On the 2014 4rt there is a part listed on the parts book described as "orifice # 190" ,item 18,on the left crankcase drawing.This appears to be the only visable difference with pre 2014 engine crankcases.the part is priced at approx 50 euros.Is this part of the 2014 engine braking system?If so can it be addapted to earlier engines?

I've yet to find anyone who has noticed any difference in the engine braking on the 14 bikes? there's no doubt though that the new bikes rev more freely and seem to pull better/stronger than previous models.

I've yet to find anyone who has noticed any difference in the engine braking on the 14 bikes? there's no doubt though that the new bikes rev more freely and seem to pull better/stronger than previous models.

The same goes for my 2015 4RT

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