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June 14th, 2019, 11:25 AM   #11
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Seems to me it's 5 clicks left, the timing chain should definitely be tensioned, right? Is there any minor nut or anything in particular that may have come loose behind the left cover?

Last edited by mackan123; June 14th, 2019 at 11:36 AM.
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June 14th, 2019, 05:06 PM   #12
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If the cam chain is O.K. you may want to look at the autodecompression device "spring". As the bike ages the spring can lose tension or become unseated so that there is no tension whatsoever. At low RPM's the decomp will flop around hitting the stop making a sort of metal on metal ting ting ting sound. As RPM's increase the decomp stays seated against the stop and the noise subsides.

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Use a mechanics stethoscope or take a large screwdriver and put the handle part up to your ear to help determine the location of the noise.

Last edited by husabutt; June 14th, 2019 at 05:12 PM.
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June 15th, 2019, 04:45 AM   #13
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Yes, it does sound like its coming from the top of the engine, not the bottom as i first thought. Now, if its the decomp spring making the noise, is it safe to drive with or should i replace it before any driving? What can happen if it fails? Also, do i need to buy new gaskets etc. when replacing the spring?
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June 15th, 2019, 05:29 AM   #14
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grabe the flywheel with your hands and try and shake the crank. then turn the crank into a new position and try again. there are two turns to a cycle so have several goes.

just take the rocker cover off and check but i don't think that that is top end either.

balncer rattling? mains?

not sure

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June 15th, 2019, 08:51 AM   #15
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The decomp spring, is it supposed to be under tension? It was pretty loose indeed, i could jiggle it very easy.
When i shook the crank, i could feel a small "gap" like it was loose, but only every other turn. So one turn it was completely solid, next it was a small play in there.
Hope you can make sense out of this
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June 15th, 2019, 11:37 AM   #16
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one time around there is a compression, the next time there isn't. the compression stops you "bouncing" the crankshaft. if you pull the plug out it may do it all the time.

any hint, no matter how small = mains have gone and that will be the noise.

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June 15th, 2019, 11:49 AM   #17
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So i have to replace the mains? Right, what is mains again?..
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June 15th, 2019, 01:07 PM   #18
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flick back a seal and see if it is a ball or a roller bearing.

if ball you should have 0.2mm of float with a good whallop of the crank.

if roller, you should have 0.5mm of float. left right left 0.5mm.

this is where it goes wrong. that and cheap bearings.

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June 16th, 2019, 12:48 AM   #19
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Which seal is it i should check upon?

Last edited by mackan123; June 16th, 2019 at 07:04 AM.
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June 16th, 2019, 07:46 AM   #20
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Have you checked the magnet? Any silver particles on the oil screen?
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