Weird Noise, CCT or Slide Chatter?
Thread Starter
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Squid
Joined: Apr 2017
Posts: 33
Weird Noise, CCT or Slide Chatter?
Hi SH forums,
For a while now my chicken has been making a rattling sound at low RPMs (less than 3k) while taking off, crusing, decelerating, and sometimes while idling. It only occurs after the engine has warmed up.
I heard that this bike can have significant carb slide chatter, but I am not familiar with how that sounds. I want to replace the CCTs, but I don't want to drop the cash if they're not broken.
Here is a video with the sound. It is prominent as the revs are falling.
Do I need to be worried about this sound?
Thanks,
Nathan
For a while now my chicken has been making a rattling sound at low RPMs (less than 3k) while taking off, crusing, decelerating, and sometimes while idling. It only occurs after the engine has warmed up.
I heard that this bike can have significant carb slide chatter, but I am not familiar with how that sounds. I want to replace the CCTs, but I don't want to drop the cash if they're not broken.
Here is a video with the sound. It is prominent as the revs are falling.
Do I need to be worried about this sound?
Thanks,
Nathan
Senior Member
SuperBike
Joined: Mar 2012
Posts: 1,544
From: New South Wales Australia
Be done with it and fit Manual Cam Chain Tensioners !
One less thing to worry about and you can get on with enjoying the bike.
There is a good "Tutorial" on another VTR site. VTR.org is the one. Look in the workshop knowledge base.
5 mm is the correct tension of the chain when you fit the Mccts .
Good luck, it's not hard to do, just follow the instructions.
Cheers and welcome !
One less thing to worry about and you can get on with enjoying the bike.
There is a good "Tutorial" on another VTR site. VTR.org is the one. Look in the workshop knowledge base.
5 mm is the correct tension of the chain when you fit the Mccts .
Good luck, it's not hard to do, just follow the instructions.
Cheers and welcome !
Moderator
MotoGP
Joined: Jul 2007
Posts: 5,214
From: Gettysburg, Pa
If I were in your shoes, I'd do cct's and check valve clearances at the same time, and I wouldn't ride it till complete. To me, that doesn't sound like carbies.
Do you know the last time valves were checked, what's the mileage now?
Do you know the last time valves were checked, what's the mileage now?
Thread Starter
Member
Squid
Joined: Apr 2017
Posts: 33
I checked the CCTs and did the valves today. The springs in both the ccts still held tension. They were pretty hard to unwind.
Rattle is still there however. Local mechanic says only thing he can think of at this point is rod knock. Any thoughts?
Rattle is still there however. Local mechanic says only thing he can think of at this point is rod knock. Any thoughts?
Senior Member
SuperBike
Joined: Sep 2010
Posts: 1,987
From: Bisbee, AZ
The tension of the CCT springs is not an indicator of anything more than it's a spring. The springs just fail, without warning of any type.
Thread Starter
Member
Squid
Joined: Apr 2017
Posts: 33
Senior Member
SuperBike
Joined: Sep 2010
Posts: 1,987
From: Bisbee, AZ
Send a used oil sample to Blackstone Labs for analysis. The report will give you a pretty good indicator of the internal health of the engine. This will rule out a lot of expensive dead ends.
Oh, and it is perfectly clear that your CCTs have not failed, yet.
Oh, and it is perfectly clear that your CCTs have not failed, yet.
Senior Member
SuperBike
Joined: Jul 2011
Posts: 1,458
From: South of Live Free or Die & North of Family Guy
Thread Starter
Member
Squid
Joined: Apr 2017
Posts: 33
And yep I keep hearing mixed reviews about the auto CCTs. Most people I talk to in person say keep the auto ones, but the forums seem pretty dead set on the manual ones. I think for now I'll do the stopper mod.
Lastly, I have access to my brother's VTR (he got one because he liked mine). Will check to see if that one has the same kind of rattle. His has Jardine pipes though, so it might be tougher to hear.
Thread Starter
Member
Squid
Joined: Apr 2017
Posts: 33
Junior Member
Squid
Joined: Feb 2018
Posts: 9
Use a large screwdriver, place the blade all over the engine while running and place your ear against the handle of the screwdriver. You'll hear a lot of scary noises, but one will stand out. This will help you pinpoint the problem, especially since you have access to another bike to compare it to.
Thread Starter
Member
Squid
Joined: Apr 2017
Posts: 33
I tried the screwdriver trick and I didn't like it so much, so I got an actual stethoscope. Each time I try to diagnose the sound, it isn't present unfortunately. I think when the oil gets too warm it stops making the sound, which is kind of strange.
So far I've heard clattering from the rear CCT, but I need to refine my methods before I draw any solid conclusions. Will keep trying over the next few days.
So far I've heard clattering from the rear CCT, but I need to refine my methods before I draw any solid conclusions. Will keep trying over the next few days.
Junior Member
Squid
Joined: Feb 2018
Posts: 9
That is a bit strange, from my V-twin experience the front is usually the one that gets punished, unless the carb is way lean. You may be onto something that will make many of us scratch our heads. Try rolling the throttle slowly and identify at what rpm the noise is present. If the chain is under tension at all time, it normally won't make noise, and if its not an exhaust leak, than it probably is a valve issue, hopefully not. How is the temp on both cylinders? Compare the two to see if there is a difference, which is either caused by friction or lean fuel mixture.
Thread Starter
Member
Squid
Joined: Apr 2017
Posts: 33
Had more time to check the noise today. Here, s what i found.
-Noise occurs when engine is partially warmed up
-Stronger from the rear cylinder
-Clanking heard with stethoscope over rear cam chain area.
-Front cam chain has much less noticeable noise
I am going to replace the rear cam chain tensioner. If the noise goes away, I'll replace the front as well to be safe.
-Noise occurs when engine is partially warmed up
-Stronger from the rear cylinder
-Clanking heard with stethoscope over rear cam chain area.
-Front cam chain has much less noticeable noise
I am going to replace the rear cam chain tensioner. If the noise goes away, I'll replace the front as well to be safe.
Senior Member
SuperBike
Joined: Sep 2010
Posts: 1,987
From: Bisbee, AZ
Had more time to check the noise today. Here, s what i found.
-Noise occurs when engine is partially warmed up
-Stronger from the rear cylinder
-Clanking heard with stethoscope over rear cam chain area.
-Front cam chain has much less noticeable noise
I am going to replace the rear cam chain tensioner. If the noise goes away, I'll replace the front as well to be safe.
-Noise occurs when engine is partially warmed up
-Stronger from the rear cylinder
-Clanking heard with stethoscope over rear cam chain area.
-Front cam chain has much less noticeable noise
I am going to replace the rear cam chain tensioner. If the noise goes away, I'll replace the front as well to be safe.
$.02
Moderator
MotoGP
Joined: Jul 2007
Posts: 5,214
From: Gettysburg, Pa
Just a suggestion: Pull the valve covers before any thing else. This will give you a crystal clear view of what is going on with the cam chain. Also, at the absolute minimum, replace the auto CCTs with new ones. Or, as this would be a good opportunity to do the stopper mod, if you're not going to do manual CCTs.
$.02
$.02
Or wait till something breaks, then you know what to fix.
Thread Starter
Member
Squid
Joined: Apr 2017
Posts: 33
Going to change the oil today. If it comes out ok (not glittery), I'll finally cave in to manual ccts.
APE ccts seem hard to come by. Where would be a good place to pick up a set? Could i go with off brand ones instead? On ebay they seem to be about half the price.
APE ccts seem hard to come by. Where would be a good place to pick up a set? Could i go with off brand ones instead? On ebay they seem to be about half the price.
Senior Member
Back Marker
Joined: Nov 2012
Posts: 211
From: Henderson, NV
Krieger cam chain tensioners
Senior Member
Superstock
Joined: Sep 2013
Posts: 460
From: Costa Mesa, CA
I had a set of Kiegers and a set of off brand Ebay specials. With the exception of the quality of the anodizing and lack of gaskets, I couldn't find a quality or dimensional difference. I installed the off brand ones in my SH 20+k miles ago with no problem, so far. I did however use the VTR1000.org write up on adjusting them.
Senior Member
SuperBike
Joined: Sep 2008
Posts: 1,707
From: Essex, UK
Senior Member
Back Marker
Joined: Jun 2005
Posts: 126
From: Paris
Senior Member
Back Marker
Joined: Jan 2017
Posts: 214
CHANGE THE CCTs...... this **** about them being ok is total *****, dont believe people, every dead vtr in the world died because of??? ccts....they give little of no warning, the first thing you will know about them is the front pot shitting itself all over the road
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