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knocking noise from primary

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Old 04-24-2014, 04:49 PM
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Default knocking noise from primary

recently I've notice a whine while in first gear up to 2500rpm, but it goes away when I hit second or the bike is loud enough I don't hear it anymore. when I pulled in after a 5 mile ride, I hear a knocking noise when in neutral and the primary cover is hot. just rolled 3k on it. am I just hearing things
 
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Old 04-24-2014, 04:56 PM
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You're drive belt maybe dry. Put a little poly lube on it. The notches will sometimes clunk when they get dry
 
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Old 04-24-2014, 07:13 PM
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that would explain the whinning noise but not the neutral knocking.
 
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Old 04-24-2014, 08:26 PM
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primary is normally hot. maybe your primary chain is getting ready to rachet to next notch? new bike it keeps it up I'd have it checked out and report back so the rest of us know.
 
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Old 04-24-2014, 09:01 PM
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Mine has the first gear whine also
 
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Old 04-24-2014, 09:07 PM
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Originally Posted by Sam2010
primary is normally hot. maybe your primary chain is getting ready to rachet to next notch? new bike it keeps it up I'd have it checked out and report back so the rest of us know.
That was my guess also... Chain is getting loose to the point the adjuster needs to rachet up one notch.

I read in another thread that you can get it to adjust by driving in 1st gear and accelerate quickly to about 4000 RPM, then let off the throttle quickly and let the RPMs drop back down to almost idle 1000-1500 then accelerate quickly again to 4000 RPM and back down. Repeat this 4 to 5 times to get the adjuster to ratchet to the next notch.

I have done this before and it seems to work. I experienced the primary knock or chain slap when I had about 1200 miles on mine. It's been good now.
 
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Old 04-24-2014, 10:09 PM
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Originally Posted by jstrenn
That was my guess also... Chain is getting loose to the point the adjuster needs to rachet up one notch.

I read in another thread that you can get it to adjust by driving in 1st gear and accelerate quickly to about 4000 RPM, then let off the throttle quickly and let the RPMs drop back down to almost idle 1000-1500 then accelerate quickly again to 4000 RPM and back down. Repeat this 4 to 5 times to get the adjuster to ratchet to the next notch.

I have done this before and it seems to work. I experienced the primary knock or chain slap when I had about 1200 miles on mine. It's been good now.
that should work to get it to the next notch. You are basically creating slack in it on decel I believe. great post there jstrenn
 
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Old 04-25-2014, 08:59 AM
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thanks guys. i'll give it a try this afternoon and report back. I was unaware that it had an auto chain adjust.
 
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Old 04-25-2014, 12:20 PM
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it's gone!!yeah. I ran it up to 4k and down to 1800 3 times and it went away. phew!!
 
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Old 04-25-2014, 04:14 PM
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Originally Posted by skybox ed
it's gone!!yeah. I ran it up to 4k and down to 1800 3 times and it went away. phew!!
Good to hear!! Always good to find an easy fix.
 


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