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Old 05-06-2018, 09:16 AM   #1
marmono
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finding compression stroke

I have an 04 cbr600rr, adjusted valves yesterday and timing got fubar. reset and lined everything back up. Before I went to sleep last night it occurred to me that I didnt bother to check that I was TDC on COMPRESSION stroke. No problem I thought, Ill just remove the spark plug, stick my chopstick down the hole on cylinder 1 and watch it fall/rise....I got my chopstick down the hole and turn the crankshaft and it doesnt rise/fall at all....what am I missing here? isnt the piston supposed to move as I turn the crank?
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Old 05-06-2018, 10:13 AM   #2
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Before the valve adjustment, did the engine sound like rocks in a washing machine?

Yes?
A valve adjustment may not have been enough maintenance.

No?
That may not be the crank you are turning.

Post a pic of the "crank".
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Old 05-06-2018, 10:30 AM   #3
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bike was fine before adjustment other than bike has 30k miles and after checking I had 5 valves out of spec, normally its easy peazy just mark my positions on the chain and put it back exactly how it was...not an option this time because I lost TDC. Ill post a pic of what I got:


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Old 05-06-2018, 10:32 AM   #4
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you've done this before?
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Old 05-06-2018, 10:35 AM   #5
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adjusted valves yes, lost TDC and timing during the process NO
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Old 05-06-2018, 11:08 AM   #6
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If you're pretty certain you are out of time, do NOT turn the engine over.
Remove the cams.
Set the crankshaft position on the rotor as described by the manual.
Install the cams with the marks on the sprockets as directed by the service manual.
After you reinstall the cam chain tensioner slowly turn the engine over by hand a couple of times and then recheck that your timing marks line up at the crank and cams.
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Old 05-06-2018, 11:22 AM   #7
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thank you for the response, I am far from trying to turn the engine over, all my electric is disconnected etc. I am confident that I am lined up, BUT am I lined up on the correct stroke? thats what I dont know how to tell other than sticking a chopstick atop the piston and watching it rise to its highest point.

my plan is

1.take out sparkplug from cylinder 1
2.insert chopstick into the hole
3. turn until chopstick reaches its highest point and hash mark TI is lined up
4. install cams to where hash marks are aligned
5. done.

does that seem reasonable?
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Old 05-06-2018, 07:54 PM   #8
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I am not sure about your CBR, but my Kawasaki has a small bolt that holds the timing plate onto the crankshaft. But it should NOT be used to turn the crankshaft. Instead a 17 mm hex headed device that surrounds that bolt should be used. If the small bolt is used, then it may be stripping out and not turning the engine over; hence the chopstick won't move up and down.

Read again what Patrick said. He is right on track. Beware that turning the engine over, even when using hand wrenchs - can bend valves if things are out of time.

If you aligned your marks on the chain with marks that you made on the cam sprockets - AND you didn't let the chain skip a notch where it engages the crankshaft - then you may be OK. I hope so. But if you are not absolutely sure of what you are doing, then do not turn the engine over. Even bolting the cam caps back down - if the cams are out of time - can do damage. Get another person to check everything out, and then proceed with extreme caution. Good luck.
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Old 05-06-2018, 08:53 PM   #9
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thank you for the response. I found that I wasnt getting the chopstick in the hole but it was on the lip. once I shined a flashlight down the hole I could guide it down, and I was able to see it move to the pistons top position. At that point I aligned the hash marks and verified cams were indeed outward facing on cylinder 1. I turned the engine over and it seemed to be running properly. I didnt run it long, as it was getting late so I guess time will tell. I DID NOT know that simply turning by hand could damage valves but thinking about it, that obviously makes sense, thank you for the information.
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