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                                           </font>Le cylindre - piston</td>                                       </tr>                                       <tr>                                          <td bgcolor="#143982" height="top"></td>                                       </tr>                                       <tr>                                          <td bgcolor="#000000" height="top"></td>                                       </tr>                                     </table>                                     <table width="100%" border="0" cellspacing="0" cellpadding="0">                                       <tr>                                          <td bgcolor="#336699"><p>&nbsp; </p>                                           <p>Le cylindre-piston</p>                                           <pre>                           <img src="images/piston.JPG" width="115" height="143"></pre>                                           <p>Le piston va et vient &agrave; l'int&eacute;rieur                                              du cylindre. Les segments du piston                                              doivent avoir une &eacute;tanch&eacute;it&eacute;                                              parfaite avec les parois du cylindre                                              pour obtenir une bonne compression                                              et un minimum de frottements. Les                                              cylindres sont parfois compos&eacute;s                                              de mat&eacute;riaux de qualit&eacute;                                              comme l'aluminium avec rev&ecirc;tement                                              Nikasyl (nickel et carbure de silicium).                                              L'utilisation de ces mat&eacute;riaux                                              permet de r&eacute;duire les frottements.                                              La position et la forme des transfert                                              d&eacute;terminent les performances                                              du moteur. Sur le march&eacute; on                                              trouve donc des cylindre en fonte                                              (moins chers et plus solides) et les                                              cylindres en alu (fragiles mais performants).                                              Les kits 50 sont appel&eacute;s ainsi                                              parce qu'ils correspondent &agrave;                                              la cylindr&eacute;e autoris&eacute;e                                              sur la voie publique d&egrave;s 16                                              ans c'est &agrave; dire 49.9 cm3.                                              La taille du piston &eacute;tant de                                              39-40 mm. LEs kits 75 correspondent                                              &agrave; une cylindr&eacute;e de 75                                              cm3 et ne sont autoris&eacute;s qu'en                                              comp&eacute;tition. Le piston a dans                                              ce cas un diam&egrave;tre d'environ                                              47 mm. Rouler sur la voie publique                                              avec un kit 75 a de graves cons&eacute;quences                                              : </p>                                           <p>1. Comme vous changer les caract&eacute;ristiques                                              de votre machine, celle-ci n'est plus                                              conforme &agrave; la r&eacute;glementation                                              et l'&eacute;ventu&eacute;lle garantie                                              de la machine ne fonctionne pas. <br>                                             2. L'assurance du v&eacute;hicule                                              &eacute;tant subordonn&eacute;e &agrave;                                              la cylindr&eacute;e, en cas d'accident                                              vous n'&ecirc;tes pas assur&eacute;.                                              <br>                                             3. En augmentant la vitesse de votre                                              machine qui n'a pas &eacute;t&eacute;                                              con&ccedil;ue pour rouler comme cela,                                              vous la fragiliser et les risques                                              de casse sont donc beaucoup plus importants.<br>                                           </p>                                           <pre>&nbsp;     </pre>                                           <pre>&nbsp;                 </pre>                                           <p><strong><font size="2"><u><br>                                             <font size="1"> </font></u></font></strong></p>                                           <p>&nbsp;</p></td>                                       </tr>                                       <tr>                                          <td bgcolor="#336699"> <div align="center">                                              <br>                                             <p align="left">&nbsp;</p>                                             <p align="left"><font size="2"> </font>                                              </p>                                             <center>                                             </center>                                           </div></td>                                       </tr>                                     </table></td>                                 </tr>                               </table></td>                           </tr>                         </table>                         <br> </td>                       <td width="20%" valign="top"><br> <table width="95%" border="0" cellspacing="0" cellpadding="0" align="center">                           <tr>                              <td bgcolor="#000000"> <table width="100%" border="0" cellspacing="1" cellpadding="0">                                 <tr>                                    <td valign="top"> <table width="100%" border="0" cellspacing="0" cellpadding="0" bordercolor="#336699">                                       <tr>                                          <td bgcolor="#4B74AC" height="1"></td>                                       </tr>                                       <tr>                                          <td bgcolor="#003399" height="14"> <div align="center">&lt;|                                              Link's |&gt; 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