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post #1 of 10 (permalink) Old 03-22-2016, 11:37 PM Thread Starter
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Hi,
On occasion when I start my F3 675 while hot (normally after has been sitting for 5-10 minutes after been ridden) it will make a chattering noise when started for 30 seconds to a minute. It also doesn't want to rev at all when this happens (this was how I noticed it the first time). Is this something to be concerned about and what is causing it (is it the cam chain tensioner?)?

After the initial start noise with this it revs and sounds fine.
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post #2 of 10 (permalink) Old 03-22-2016, 11:52 PM
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Not the cam chain tensioner.

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post #3 of 10 (permalink) Old 03-22-2016, 11:53 PM Thread Starter
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Not the cam chain tensioner.
Any idea what it is? It doesn't always happen.

Last edited by F3-Matt; 03-23-2016 at 12:10 AM.
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post #4 of 10 (permalink) Old 03-23-2016, 08:09 AM
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Can you get a better idea of where its coming from?
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post #5 of 10 (permalink) Old 03-28-2016, 04:58 PM Thread Starter
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Can you get a better idea of where its coming from?
It sounds like its coming from the left side of engine, hard to pinpoint
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post #6 of 10 (permalink) Old 03-28-2016, 07:20 PM
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Wink ?

Matt,

Ask the sprag clutch victims....




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post #7 of 10 (permalink) Old 03-28-2016, 08:22 PM Thread Starter
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Matt,

Ask the sprag clutch victims....



Wouldn't think it is sprag clutch as my bike has never not started first time. This noise is when the bike is running for the first 30 seconds to a minute then sounds normal.

it didn't do it at all this weekend at all with cooler weather though.
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post #8 of 10 (permalink) Old 05-16-2016, 05:11 AM
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sometimes get the same whan coldstarting and i 2 belive its the spraq cause it stops after a while!

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post #9 of 10 (permalink) Old 05-16-2016, 10:40 AM
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Does the noise go when you pull in the clutch (in neutral)?

Kag

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post #10 of 10 (permalink) Old 05-23-2016, 01:25 PM
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Remember : there are no bearings on the cams shafts,sometimes they are also hollow and drilled for oiling cams just before to apply a force on the valves>>>it takes a long time to pressurize all these parts .

Ideally oil pump must run before engine fires or put a second pump closer to the cam shafts (ideally !!!)
The older ducati desmo were bearing fitted , now they follow this cheap construction , but there the stresses are lower (no springs to compress), cams running by hands (rubber belts) ,

If you are confortable with your bike, you are not fast enough ! John Kocinski
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