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FJR Motorcycle Forums
Technical & Mechanical Problems
Best location to ty-wrap cam chain on crank?
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<blockquote data-quote="Fred W" data-source="post: 1416619" data-attributes="member: 3828"><p>Ty-wrapping the chain to itself or jamming the socket behind the chain guide like I showed in my linked to post will only work for removing and replacing the CCT. You need to get enough chain slack to pull the cam(s) out for a valve adjustment.</p><p></p><p>For valve adjusts, with everything lined up at TDC, I just ty-wrap the chain to the top of each of the cam sprockets. That fixes their position in relation to each other so the only one you have to worry about changing is at the crank.</p><p></p><p>Most likely when you pull the cams up youll introduce slack on the front side of the chain where there should be none, and the chain will jump one tooth on the crank. The trick is, when putting everything back together, to turn the crankshaft backwards a few degrees (CCW) while fitting the chain at the crank sprocket, and gather most of the slack in the rear chain run. Tension the chain temporarily (use the socket trick) and turn the crank back CW to the timing mark. Everything should be back in time.</p><p></p><p>Its OK to turn the crankshaft backwards by itself, but you never want to turn it backwards very much when the chain is hooked up to the cams as youll put a lot of chain pressure on the CCT.</p><p></p><p>After everything looks good you reinstall the CCT, cut the ty-wraps on the cam sprockets and rotate the crank around a couple of turns by hand to recheck timing marks.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1416619, member: 3828"] Ty-wrapping the chain to itself or jamming the socket behind the chain guide like I showed in my linked to post will only work for removing and replacing the CCT. You need to get enough chain slack to pull the cam(s) out for a valve adjustment. For valve adjusts, with everything lined up at TDC, I just ty-wrap the chain to the top of each of the cam sprockets. That fixes their position in relation to each other so the only one you have to worry about changing is at the crank. Most likely when you pull the cams up youll introduce slack on the front side of the chain where there should be none, and the chain will jump one tooth on the crank. The trick is, when putting everything back together, to turn the crankshaft backwards a few degrees (CCW) while fitting the chain at the crank sprocket, and gather most of the slack in the rear chain run. Tension the chain temporarily (use the socket trick) and turn the crank back CW to the timing mark. Everything should be back in time. Its OK to turn the crankshaft backwards by itself, but you never want to turn it backwards very much when the chain is hooked up to the cams as youll put a lot of chain pressure on the CCT. After everything looks good you reinstall the CCT, cut the ty-wraps on the cam sprockets and rotate the crank around a couple of turns by hand to recheck timing marks. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Best location to ty-wrap cam chain on crank?
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