April 23rd, 2018, 04:55 PM | #1 |
ninjette.org member
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Cam Chain - Is this one bad?
I did this whole write up about the work I've done on my bike but it's saying that moderator approval is necessary so I must have done it incorrectly. That was a few days ago, so I'm posting again. Can someone familiar with this issue look at my video and tell me if this cam chain is stretched and needs replacing? And does anyone know of a ninjette thread that shows a replacement?
https://www.youtube.com/watch?v=K2ljecz4euc |
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April 23rd, 2018, 05:25 PM | #2 |
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If your tensioner is not tensioning in the video, the chain will look goofy as the valves make the cam difficult to turn (chain driving cam), and then try to jump ahead (cam driving chain), alternating. I'd adjust the tensioner correctly and then rotate the engine and watch the chain.
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April 23rd, 2018, 08:25 PM | #3 |
ninjette.org member
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Krieger manual tensioner has been installed as per Mark Krieger. In the video you can see the chain as it turn with no tension and with tension applied. There is a tight spot in the engine rotation. Everything I've read indicates the chain is done and needs replacing.
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April 23rd, 2018, 08:35 PM | #4 |
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OK, I understood you to say the tensioner was applying zero tension, which is why I said what I did.
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April 23rd, 2018, 08:42 PM | #5 |
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In the video I turn it both with/and without so that the viewer can see the play in the chain
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April 24th, 2018, 05:04 AM | #6 |
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Are your spark plugs removed? If not, when you say "tight spot" it may just be that a cylinder is under compression.
Can chains are typically not found to be bad in this manner. Instead, you must measure the distance between the links as described in the service manual. DO you have one? |
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April 24th, 2018, 10:23 AM | #7 |
ninjette.org member
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Spark plugs are out. So the tight, loose, tight condition wouldn't indicate a stretched chain? The condition exists whether or not the tensioner is applied.
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April 24th, 2018, 03:57 PM | #8 |
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re: moderator approval, I don't see anything in the queue to approve? It's not triggering on anything you did wrong, it just is a little stricter for new users who put many pics/links into their threads, as it's a good indicator of spam. It shouldn't lose your work though, just hit submit and I'll approve each of them as soon as I see them pop up in the queue. The filter gets much more lax after a few dozen posts.
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April 24th, 2018, 04:15 PM | #9 |
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I would except, like an idiot, I didn't save a copy. Which is unfortunate because I spent about an hour on it. Thanks for looking for me though.
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April 24th, 2018, 05:13 PM | #10 | |
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Quote:
I'd guess that the chain is ok, and the tight, loose, tight is the cams opening the valves. get your tension set right and turn while watching the cams opening the valves.
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April 24th, 2018, 07:50 PM | #11 |
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I'm not following what you're saying here:The Krieger manual tensioner says turn it in finger tight until it can't be turned further. Mark said to do the same thing with a wrench till it hit resistance. I did this but the rattle remained. When I turn the engine over it turns easily until it hits the "tight" spot. You can see this in the video. It happens regardless of whether there is tension or it's backed out.
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April 24th, 2018, 08:07 PM | #12 |
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Yes it's the same regardless of chain-tension because resistance comes from cam-lobes pushing on valve-springs; which doesn't change. There are two variables you need to examine:
1. tensioner-health vs. 2. cam-chain wear You need to isolate each one independently to figure out what your problem is. Chain-wear is easy, measure distance between links and calculate stretch %. Once that's been eliminated OR implicated as out-of-spec, THEN you can go on to more difficult troubleshooting of tensioner. |
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April 24th, 2018, 10:55 PM | #13 |
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Ok. So this is a brand new Krieger Manual Chain Tensioner. I installed it as per the instructions and the advice of Mark Krieger. If it's not in spec then it needs to be replace, but let's assume my chain is within spec. What more can I do to the tensioner that I'm not doing or haven't already done? Probably a better question to ask is "Based on what you're saying if this tightness in the revolution of the engine is caused by the cam lobes on the valve springs and not a worn cam chain, is this a problem, and if so what is the remedy?"
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April 25th, 2018, 06:18 AM | #14 |
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Maybe send the video (link) to Mark Krieger and see what advice he offers.
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April 25th, 2018, 06:24 AM | #15 |
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Pull the valve cover and watch the cams as you rotate the crank.
I'm thinking you will see when the lobes are contacting the rockers and opening the valves it will get harder to rotate the engine - then easier as they close. I don't think you have a damaged cam chain. |
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April 25th, 2018, 07:49 AM | #16 | |
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Quote:
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April 25th, 2018, 10:09 AM | #17 | ||
ninjette.org member
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Quote:
Quote:
Measured it. Yup it's in spec. Now what? |
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April 25th, 2018, 10:26 AM | #18 |
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What happens if you put the OEM tensioner in? IF your chain is within spec, it is not the chain causing the issue. These chains are bathed in oil so they will not "wear" like the drive chain.
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April 25th, 2018, 01:20 PM | #19 | ||
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Quote:
Quote:
1. valve-clearance done and all within spec? 2. measure rod-bearing clearances 3. compression check? 4. piston to cylinder clearances 5. clutch-roller play? 6. starter ring-gear loose? it has brass sleeve bearing that can wear out. 7. |
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April 26th, 2018, 06:45 PM | #20 | |
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Quote:
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