HELP!! rattle then engine stopped wth?!?! : Yamaha R6 : R6 Forum

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Old 08-25-2013, 04:48 PM   #1
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HELP!! rattle then engine stopped wth?!?!

Hi

I've had my 2000 stock r6 with only a micron upgrade (silencer). was running great for the past few years i've had it. only done 20000 kph recently changed the oil and stuff, bike was running a bit rich but never thinned the oil that much. i regularly kept a eye on things. but the bike did have a slight rattle (seemed like it came from the top somewhere) when i pressed the clutch the rattle would go away so might have been a worn clutch bearing?? not other nasty noises. the bike would pick up great but i thin it lacked a bit of power on higher revs ie: above 7/8.
I was returning from work the other day and parked up at traffic and put the bike in neutral, and all of a sudden omg i hear like something coming off or getting loose in the engine and the bike engine suddenly stops???!! i dont know what happened never happened before. so i roll the machine off road and try firing but nothing. so i put it in 1st gear and still nothing i then put it in second and nothing but when i bumped it back and forth trying to free the engine (panicked and wanted it freed somhow) then i tried to fire it over and the engine fired ( in 2nd gear and clutch in ) but it was like a continuous spin and no attempt to fire??!!. I put it back in to neutral and try and fire but nothing try it in 1st gear and nothing, so i put it back into second and its a continuous starter motor noise trying to fire the engine but the noise of the engine is liek something is loose and rattly.
Please help. I've opened the chain cover on the left and the chain is loose but not broken.

could my camshaft gear snap?
would it be something to do with my clutch or gearbox. and how could my timing go and chain get loose suddenly.
this forums great with all the experience can anyone shed some light pls
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Old 08-25-2013, 06:23 PM   #2
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Re: HELP!! rattle then engine stopped wth?!?!

sounds like your cam chain tensioner failed.. timing may have jumped. The fact your cam chain is lose is a tell-tale sign the cct failed. Timing jumped a little, wont' run. Jumped a lot, the valves are all bent as the pistons hit them.
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Old 08-26-2013, 04:42 PM   #3
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Re: HELP!! rattle then engine stopped wth?!?!

hi melk man thx.
well got my bike back from the garage cause they checked it and were charging too much to continue. anyways i took off the rad, the airbox and fuel tank so i could get to the cam cover. I took off the cam cover and the camshafts, chain are ok. & your right its jumped timing. about 80degrees. Now when i try and turn it over it gets stuck. like goes and stops.
you are right about the tensioner the chain was loose and only one cam spins (inlet cam) and the chain jumps over the exhaust cam. and the engine stops. like its hitting a brick wall.
I'm thiniking 1 of the pistons is hitting the valves and the engine cant go further, will i be right in assuming that??!
would the engine still spin if the timing was off?? or would i need to take the thing apart to check the valves.
i've taken the tensioner bolt off (10mm) and got to the tensioner screw, i've adjusted it and tensioned the chain but when tried to fire it the thing would go loose??!! does it need a replacement? & what is a CCT can it be replaced.
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Old 08-26-2013, 05:32 PM   #4
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Re: HELP!! rattle then engine stopped wth?!?!

yes that's what's happening. the piston is hitting the valves.

if the timing is off 1 tooth it will turn over. I never tried it 2 teeth off.

cct=cam chain tensioner.

you will need to put the timing back in right before you can test the compression of the engine to see if you did in fact bend some valves. that is if the motor will turn over by hand with it in time.
you can pull the tensioner out to inspect it. there is also a pretty expensive guide in there as well. you should replace them both if you have to do one.

anyway, here's a link to the factory service manual. everything you need to know is in it.
http://www.r6messagenet.com/forums/r...ir-manual.html
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Old 08-30-2013, 05:07 PM   #5
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Re: HELP!! rattle then engine stopped wth?!?!

right, i tried setting the timing but my exhaust side camshaft wont budge?? even with the chain off.
can anyone tell me why my exhaust cam has got stuck?
the inlet cam turns but exhaust cam is stuck solid. & would i need to grind my valve ports and stuff or could i just pop in some new valves and leave it to settle in when riding?
my bottom end of the machine should still be ok right?
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Old 08-30-2013, 05:39 PM   #6
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Re: HELP!! rattle then engine stopped wth?!?!

First, the tensioner is now garbage and needs to be replaced. That is the least of your worries. I don't think there is anything you can do now but pull the head and inspect the damage.

It's not clear weather you have been turning the engine by hand or with the starter, but a sudden stop and freezing is very bad news. Yes, it can still turn when the timing is off a little bit, but when the chain is freely skipping over teeth it will be likely to end up with pistons colliding with valves. At this point you may even have valves that are permanently open because they got bent or some other significant damage like that. You won't know how bad it is until you look inside.
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Old 08-31-2013, 06:44 PM   #7
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Re: HELP!! rattle then engine stopped wth?!?!

right. i've got the cams off and OMG 4 Exhaust gaskets (cylinder 1 + 2 ) are kind ov stuck. The valve followers have lifted off!!??!
How would that have happened???
I've tried pushing them down but they wont budge, i guess that would explain why the engine would come to a sudden halt!
cause the exhaust cam wouldn't go any further. But i dont get how the valve followers (kinda lids on the valves) could lift up?? all the other valve followers look ok. would it be ok just to replace those 4 valves....
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Old 08-31-2013, 06:45 PM   #8
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Re: HELP!! rattle then engine stopped wth?!?!

right. i've got the cams off and OMG 4 Exhaust valves (cylinder 1 + 2 ) are kind ov stuck
and not
right. i've got the cams off and OMG 4 Exhaust gaskets (cylinder 1 + 2 ) are kind ov stuck
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Old 08-31-2013, 07:36 PM   #9
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Re: HELP!! rattle then engine stopped wth?!?!

Those valves are bent. They have hit the piston and can't close all the way. This leaves the shim buckets (Followers, as you called them) with a lot of clearance to just bounce around. See attached:
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File Type: jpg Bent valve.jpg (27.8 KB, 43 views)
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Old 09-03-2013, 06:46 AM   #10
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Re: HELP!! rattle then engine stopped wth?!?!

Pull the head is next step.post some pics
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