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<blockquote data-quote="SRAD97750" data-source="post: 209031" data-attributes="member: 425">Once you see it, it's very easy to understand. Mechanically, there is nothing complicated about it. The actual theory behind 2T engines is VERY complicated, though.I happen to be starting a complete top and bottom end on a 98 CR125 and the cylinder is on the kitchen table.NOTE: YOUR EXHAUST VALVE IS VERY DIFFERENT FROM THE HONDA.Here you can see them in the closed position, just kinda hanging in the way of the exhaust port, making it shorter. These slide outboard into slots exposing the rest of the exhaust port.[ATTACH=full]29973[/ATTACH]Closed[ATTACH=full]29974[/ATTACH]Open[ATTACH=full]29975[/ATTACH]Here is the linkage on the RH side, linked to the LH side so they work in unison.[ATTACH=full]29976[/ATTACH]There is a rod that comes out of the clutch cover from the governor, which is driven from the crank. The rod moves either up or down, commanding the valves at the proper RPM.[ATTACH=full]29977[/ATTACH]-BIG DAN<img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif"&nbsp; class="smilie" loading="lazy" alt=":thumb:" title="Thumb&nbsp; &nbsp; :thumb:" data-shortname=":thumb:" /></blockquote>

[QUOTE="SRAD97750, post: 209031, member: 425"] Once you see it, it's very easy to understand. Mechanically, there is nothing complicated about it. The actual theory behind 2T engines is VERY complicated, though. I happen to be starting a complete top and bottom end on a 98 CR125 and the cylinder is on the kitchen table. NOTE: YOUR EXHAUST VALVE IS VERY DIFFERENT FROM THE HONDA. Here you can see them in the closed position, just kinda hanging in the way of the exhaust port, making it shorter. These slide outboard into slots exposing the rest of the exhaust port. [ATTACH=full]29973[/ATTACH] Closed [ATTACH=full]29974[/ATTACH] Open [ATTACH=full]29975[/ATTACH] Here is the linkage on the RH side, linked to the LH side so they work in unison. [ATTACH=full]29976[/ATTACH] There is a rod that comes out of the clutch cover from the governor, which is driven from the crank. The rod moves either up or down, commanding the valves at the proper RPM. [ATTACH=full]29977[/ATTACH] -BIG DAN:thumb: [/QUOTE]

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