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Old 11-01-18, 01:57 PM   #32
Dave-the-rave
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Join Date: May 2012
Location: London
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Default Re: 2005 SV650s Valve Clearance Question

Theoretically if you put the rear cams back exactly where they were regardless of timing marks, it would be fine.
Personally I'd do it the correct way so as to avoid expensive mistakes.

Hold the cam chain in your hand at the top, keeping enough pressure on it that it stays on the bottom sprocket as the crank/sprocket turns. Basically you're using your hand as a top sprocket.

The reason behind it all has to do with firing sequence of the cylinders and V twins are all a bit odd in that regard. Also it's important to take out and install camshafts when they arn't pressing down on the valves. ie valves are fully closed. Using the correct timing marks makes visualisation easy. It means the valves are fully closed, and it also allows chain slack to be on the side of the tensioner, so that tensioner can take up the slack. Using the F for front and back is a bit counter intuitive but that's how it is. Some engines are odd. My XV750 crank shaft runs backwards.

When you have got it all timed and bolted down turn the engine slowly by hand a few times and stop if you feel any metalic resistance. If all is well and front and back timing marks are lining up when they should then re check the valve gaps and write them down. That's when the F and R marks are used.
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