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View Results: What is the horrible noise?
Cam chain tensioner 2 5.13%
Camshaft rockers / bearings 10 25.64%
Big end 10 25.64%
Gearbox main shaft bearing 3 7.69%
Crankshaft bearings 8 20.51%
Other? 6 15.38%
Voters: 39. You may not vote on this poll

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Old 02-09-2013, 04:02 PM   #16
gunnerbuck
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What year is your bike?
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Old 02-09-2013, 06:38 PM   #17
klxmack
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Ha ha, Hold it up to the phone again! wait, it sound like opportunity knocking.

If motor was quiet, then got loud and you have oil in the motor, then its tear down time.

Taking a pole and getting advise is kinda silly.


Sorry my friend, shit happens.


Cheers
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Old 02-10-2013, 06:49 AM   #18
gunnerbuck
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[quote
Refer to that thread now, so far no end float in either side of crank, clutch seems fine. Counter balance outer case bearing is fine, but without removing there seems to be a lot of play on the inner bearing. Waiting for tools to arrive to remove. I have a sneaking suspicion it is the counter balance and the cam rockers.quote]

There doesn't have to be end float on either end of the crank for the bearing to be bad, the running surface of the races only need to be galled... If you have the head/cylinder off you can spin the crank rapidly around in the case and listen for the grinding noise to indicate a rough bearing...

As for the balancer being shot, I have a sneaking suspicion that you won't get away that easy, but one can only hope...

gunnerbuck screwed with this post 02-10-2013 at 06:55 AM
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Old 02-10-2013, 07:10 AM   #19
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Turning it over by hand with the spark plug out doesnt give me any noise, atm I am suspecting counter balance and possibly cam... just waiting for strap wrench to arrive to get clutch off
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Old 02-10-2013, 07:17 AM   #20
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So, what's the oil look like?
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Old 02-10-2013, 08:43 AM   #21
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Fair amount of pulverised steel on the plug, corrr
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Old 02-10-2013, 12:23 PM   #22
Kawidad
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Quote:
Originally Posted by moto_psycho View Post
Fair amount of pulverised steel on the plug, corrr

Well that ain't good.................
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Old 02-10-2013, 01:38 PM   #23
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my money is on a bad big end .. scored cylinder
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Old 02-10-2013, 09:52 PM   #24
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Originally Posted by moto_psycho View Post
PayPal have locked my account until 5 clears, so hopefully mid week I will have a strap wrench to take the clutch basket off, afterwards I will take the counter shaft out and start her up again, I'll make the same video again we'll see what wee get!
Do you have an air wrench?
To loosen the nut I'd heat it with propane first in case someone used red loctite on it, then put it in gear and have someone stand on the rear brake and knock it loose with the air or a hammer.

Think that should work if the chain is on...or does the basket just spin?

bill
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Old 02-10-2013, 09:54 PM   #25
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If that is the case, am I better off getting just a new bearing, or buying a whole crank assembly?

The noise was definately loudest at the front left of the engine. It actually seemed quite quiet when you got your head right up to the right side.... but we will see....
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Old 02-11-2013, 05:05 AM   #26
ericGSsti
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Not sure how relivent it is to you but I posted I had similar knocking noise to your bike in mine. Thought it was clutch related as it sounded noisiest there. Dropped the oil and found metal on the sump same as yourself, no obvious sign of wear anywhere. He pulled the starter cover and the ring gear on the motor had shredded. So for me easy fix. Replace gear and ring bearing on the starter.
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Old 02-11-2013, 07:50 AM   #27
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Was the bike still starting fine on the button?
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Old 02-11-2013, 08:40 AM   #28
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Also, has anyone ridden their 640 long term without a balance shaft? Generally I don't care about vibrations, and just imagine... 0.0001 extra hp at the rear wheel!
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Old 02-11-2013, 09:19 AM   #29
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Yes started first time every time.
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Old 02-11-2013, 09:44 AM   #30
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SOUNDS ok to me.
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