{"product_id":"valvulas-escape-admision-piaggio-scooter-125-200-250-300-4t-4v-tnt","title":"Válvulas Escape\/admissão Piaggio scooter 125\/200\/250\/300 4T 4V TNT ","description":"\u003cp\u003e\u003cstrong\u003eVálvulas de admissão e escape TNT\u003c\/strong\u003e para motores \u003cstrong\u003ePiaggio 125 \/ 200 \/ 250 \/ 300 4T\u003c\/strong\u003e, destinadas a reparar a \u003cstrong\u003ecolaça\u003c\/strong\u003e quando as válvulas originais apresentam desgaste, perda de estanquidade ou danos na zona do assento.\u003c\/p\u003e\n\n\u003cp\u003eNum motor 4T, uma válvula que não fecha perfeitamente faz perder \u003cstrong\u003ecompressão e desempenho\u003c\/strong\u003e. Os sintomas costumam surgir pouco a pouco: o motor custa mais a arrancar, perde força, o ralenti deixa de ser estável ou a compressão começa a baixar, embora o cilindro e os segmentos estejam em bom estado.\u003c\/p\u003e\n\n\u003cp\u003eA \u003cstrong\u003eválvula de admissão\u003c\/strong\u003e controla a entrada de ar e combustível na câmara, enquanto a \u003cstrong\u003eválvula de escape\u003c\/strong\u003e trabalha diretamente com os gases quentes da combustão. Esta última suporta uma carga térmica muito superior e é habitual encontrá-la com o assento deteriorado ou até parcialmente queimada quando o motor trabalhou com temperaturas elevadas, afinações incorretas ou muitos quilómetros.\u003c\/p\u003e\n\n\u003cp\u003eMontar válvulas novas permite recuperar a \u003cstrong\u003evedação entre válvula e assento\u003c\/strong\u003e, algo fundamental para voltar a ter uma boa compressão. Se a \u003cstrong\u003ecolaça\u003c\/strong\u003e estiver corretamente reparada, o motor recupera uma combustão mais estável, melhor resposta e o desempenho que estava a perder devido às fugas na câmara.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuando convém verificar ou substituir as válvulas?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eQuando o motor apresenta \u003cstrong\u003ebaixa compressão\u003c\/strong\u003e sem desgaste evidente do cilindro ou dos segmentos.\u003c\/li\u003e\n\u003cli\u003eSe custa a arrancar, especialmente \u003cstrong\u003ea frio\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eQuando o ralenti é instável mesmo com a alimentação corretamente ajustada.\u003c\/li\u003e\n\u003cli\u003eSe existe uma \u003cstrong\u003eperda de potência progressiva\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eQuando uma válvula apresenta o assento \u003cstrong\u003epicado, queimado ou deformado\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eDurante uma \u003cstrong\u003ereconstrução completa da colaça\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eReferências OEM de admissão:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e829785\u003c\/li\u003e\n\u003cli\u003e843363\u003c\/li\u003e\n\u003cli\u003e873009\u003c\/li\u003e\n\u003cli\u003e873114\u003c\/li\u003e\n\u003cli\u003e873839\u003c\/li\u003e\n\u003cli\u003e873840\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eReferências OEM de escape:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e843362\u003c\/li\u003e\n\u003cli\u003e872999\u003c\/li\u003e\n\u003cli\u003e873809\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eConselho de montagem:\u003c\/strong\u003e mudar a válvula sem verificar o resto da \u003cstrong\u003ecolaça\u003c\/strong\u003e não é suficiente. É importante verificar o \u003cstrong\u003eassento, guia, retentor de válvula e folga das tuches\u003c\/strong\u003e. Ao montar válvulas novas, os assentos devem ser verificados e trabalhados corretamente para garantir que toda a superfície fecha de forma uniforme e mantém a compressão.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompatibilidades:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAPRILIA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAtlantic 125 4T LC 2003-2008\u003c\/li\u003e\n\u003cli\u003eAtlantic 125 4T LC 2010-2011\u003c\/li\u003e\n\u003cli\u003eAtlantic 200 4T LC 2003-2005\u003c\/li\u003e\n\u003cli\u003eAtlantic 250 4T LC 2004-2008\u003c\/li\u003e\n\u003cli\u003eAtlantic 300 4T LC 2010-2012\u003c\/li\u003e\n\u003cli\u003eScarabeo 125 4T LC 2003-2006\u003c\/li\u003e\n\u003cli\u003eScarabeo 125 Touring 4T LC 2003-2004\u003c\/li\u003e\n\u003cli\u003eScarabeo 200 4T LC 2003\u003c\/li\u003e\n\u003cli\u003eScarabeo 200 4T LC 2006\u003c\/li\u003e\n\u003cli\u003eScarabeo 250 4T LC 2004-2006\u003c\/li\u003e\n\u003cli\u003eScarabeo 250 Light 4T 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