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THE DISASTER!

Tonight I could not resist, was missing too little! I took the engine in my room, I covered my desk with paper and I opened the coconut! The silicone seal makes it quite difficult to separate the casing, but here is the barbatrucco: There are two threaded holes made on purpose to drive a stripper. A little bit of tension, and a martellatina ZAC! Nothing separates the housing problem, there is only a small plug with a hollow ring not to be missed, the rest is easy.
Just look at the exchange and here is the disaster! The third and fifth were completely in cows. The corruption that have been called pitting. It 'a phenomenon of fatigue which is manifested on the surface and is derived from the cyclic contact between bodies, in this case between the gear teeth. This contact results in a distribution "terrestrial" in efforts to find a most a few tenths below the surface of contact. There he began to develop a crack that propagates slowly to the surface. When the crack surfaces, a small piece of material falls out, leaving a crater. Ironically a few months is that I am doing the thesis on this. Will take advantage to make some metallographic analysis laboratory at the Polytechnic, to see to understand what happened. In all likelihood si tratta di un difetto di fabbricazione, visto che molti TTR sul forum hanno già avuto questo stesso problema (proprio alla terza e alla quinta). Escluderei un errore di progettazione, visto che da 20 anni lo stesso cambio funziona benissimo sugli XT e sui TT vecchi. Potrebbe essere colpa della lavorazione, del materiale o del trattamento termico. Un profilo di micro-durezza e un'occhiata al SEM (microscopio elettronico) dovrebbero chiarire la situazione.
Ora rimango in dubbio su cosa fare: domani vado in Yamaha a chiedere i prezzi dei ricambi originali. Sul catalogo di KEDO in germania le ruote dentate costano una 50ina di euro l'una, e l'ordine da KEDO lo devo fare comunque, per le guarnizioni. Mi è stato anche offerto un motore completo di XT EUR 150, to withdraw from Bologna. I've got another change of TTR, bought a few months ago but that he is corrupt (though less than mine), I could recall one or two wheels, but I do not like the idea of \u200b\u200bcoupling a wheel with a new one.

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