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FJR Motorcycle Forums
Technical & Mechanical Problems
Changed CCT but now won't start --HELP
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<blockquote data-quote="HaulinAshe" data-source="post: 757731" data-attributes="member: 1875"><p><strong>*** PLEASE EVERYONE! READ THIS WARNING! ***</strong></p><p></p><p>I've seen this condition personally several times. That's why NOW I insist on tie-wrapping the cam chain on both sides of the crank sprocket BEFORE changing the CCT. If nothing moves while you have the old CCT out, everything goes fine. But if the Intake-side chain guide moves (as his obviously did) the resulting slack collects at the crank gear and a timing change results as soon as anything is bumped or rotated.</p><p></p><p>I know exactly the CCT bolt problem he's describing. It's caused when the Intake side guide backs away (after the old CCT is removed) and allows the chain to go slack. When the new CCT is installed, the chain/guide can't return to position and allow enough room for the fully-retracted new CCT to properly seat in the hole. If he went ahead and tightened the CCT bolts without lifting the slack chain and returning the guide to position, it may have damaged the chain.</p><p></p><p>That condition is caused by slack in the cam chain that has accumulated at the crank sprocket. You all are correct in saying that enough slack cannot be accumulated to allow the chain to jump time. BUT... if that slack is allowed to accumulate at the crank sprocket and then anything is moved, it will jump time one tooth at the crank sprocket.</p><p></p><p>The resulting timing change leaves the cams in time with each other and one tooth off-time from the crank. It does not (typically) damage anything. The engine is nearly impossible to start. It may start WOT but will not idle. Re-timing requires both cams be removed to create enough chain slack.</p></blockquote><p></p>
[QUOTE="HaulinAshe, post: 757731, member: 1875"] [B]*** PLEASE EVERYONE! READ THIS WARNING! ***[/B] I've seen this condition personally several times. That's why NOW I insist on tie-wrapping the cam chain on both sides of the crank sprocket BEFORE changing the CCT. If nothing moves while you have the old CCT out, everything goes fine. But if the Intake-side chain guide moves (as his obviously did) the resulting slack collects at the crank gear and a timing change results as soon as anything is bumped or rotated. I know exactly the CCT bolt problem he's describing. It's caused when the Intake side guide backs away (after the old CCT is removed) and allows the chain to go slack. When the new CCT is installed, the chain/guide can't return to position and allow enough room for the fully-retracted new CCT to properly seat in the hole. If he went ahead and tightened the CCT bolts without lifting the slack chain and returning the guide to position, it may have damaged the chain. That condition is caused by slack in the cam chain that has accumulated at the crank sprocket. You all are correct in saying that enough slack cannot be accumulated to allow the chain to jump time. BUT... if that slack is allowed to accumulate at the crank sprocket and then anything is moved, it will jump time one tooth at the crank sprocket. The resulting timing change leaves the cams in time with each other and one tooth off-time from the crank. It does not (typically) damage anything. The engine is nearly impossible to start. It may start WOT but will not idle. Re-timing requires both cams be removed to create enough chain slack. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Changed CCT but now won't start --HELP
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