Noise on Deceleration

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KEVUSVTR
Posts: 4
Joined: Tue Aug 19, 2003 7:35 pm
Location: California, USA

Noise on Deceleration

Post by KEVUSVTR »

Just throwing this out there to see if anyone may have an idea as to what the problem may be.

I have an 02 SuperHawk (Firestorm) here in California. About 20 thousand miles on it. I just had the valves adjusted and the cams and cam chain tensioners checked...everything mechanically is great.

However, while in neutral and in gear, as the RPMs drop between the 2,000 down to 1,500 RPM range, I hear a loud ticking noise that sounds like its coming from the rear cylinder or under the airbox.

As I said, I just had the valves adjusted, and everything else checked out, and the noise will not go away.

Any ideas are greatly appreciated. feel free to post suggestions and thoughts here or email me @ kran550@hotmail.com

Thanks...
Gotta be a Twin!
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Bink
Posts: 306
Joined: Mon Jun 21, 2004 4:13 pm
Location: Dublin, Ireland

Post by Bink »

If I were you I'd let the mechanic have an other listen to the CCT's.
Just because the have just been checked does not mean they won't fail in the next few miles!
A tell tale sign is to Rev the engine in neutral when stationary and listen when it revs down - If there is a rattle (more then usual) it could well be the CCT.

Get them checked - better safe then :( !
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RQ
Posts: 623
Joined: Wed Jul 09, 2003 10:31 pm
Location: Limerick , Ireland

Post by RQ »

Get a pencil or a wooden rod, put it up against the CCT, and the other end in your ear. That'll soon tell you whether its the CCT or not!!
RQ.
The Stig of 2 wheels as well as 4 !
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KEVUSVTR
Posts: 4
Joined: Tue Aug 19, 2003 7:35 pm
Location: California, USA

Post by KEVUSVTR »

Thanks fellas. The CCT's were checked when the valve job was done and there was no sign of any problem with the cam chain, or the tensioners.

Funny part is...the noise isn't there all the time. Which I'm starting to think...to hell with it! Ride it!

We'll see what happens.
Gotta be a Twin!
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Bink
Posts: 306
Joined: Mon Jun 21, 2004 4:13 pm
Location: Dublin, Ireland

Post by Bink »

Kev,

We all like taking risks - that's probably why we ride bikes 8)
But I did the same and ended up spending €850,- for engine repairs.
My bike had a full 16k mls service and the rear CCT went at 17.5K mls...
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Bink
Posts: 306
Joined: Mon Jun 21, 2004 4:13 pm
Location: Dublin, Ireland

Post by Bink »

By the way .... that's $1045 in your money :evil:
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Max
Posts: 878
Joined: Fri Mar 12, 2004 10:12 am
Location: Pembrokeshire

Post by Max »

I had a rattly noise, Tensioners checked seemed OK..........
Replaced Tensioners with manual ones noise now gone............

Max
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bluesman
Posts: 526
Joined: Sun Jul 25, 2004 3:53 pm

life full of surprises

Post by bluesman »

Max wrote:I had a rattly noise, Tensioners checked seemed OK..........
Replaced Tensioners with manual ones noise now gone............

Max
I am off manual CCT idea...
One of my friends called me about month back - he felt his Kawasaki VN750 CCTs were actually gone (springs weakened), but just "not yet" - poor thing rattled like rattlesnake etc.

Asked me to check if I'll find parts for him. I tried. In mean time he tried manual CCT, because I (poor idiot) gave him link I found in relation to VTR.
Several weeks after I got email from him - his bike had valves and pistons brief meeting.
B..dy manual CCT unsettled all system so much chain got longer, loose and jumped on sproket :?
He said - he tried to listen to them manual CCTs work before/during each ride, and it seemed to him pretty bad - CCTs were not following amplitude of camchain on deceleration, and you only can it get running really smooth in specific rpm range, when chain "settles".
I know - he's got an old bike (1985) but it is grey import and does not have too much mileage.
Being a mechanical engineer, I do not think manual CCTs are good idea if they have no springs or other loader in them at all - ones he had has no spring, just like long threaded pin to adjust. The meant for racing application, it's no good in daily use and it is far from smart engineering - no R&D at all.
What would be really brilliant - CCT with manual adjustement AND short-movement automatic loader, so that movement of "head" is very small, and backed by spring, and if spring brakes - "head" does not retract TOO much, not enough to make chain jump.
So - unless somebody makes half-automatic tensioners - I am going to stick with what I have.
Again, all above - IMHO, and I am sure there is people happily living with manual CCTs, just as well as some owners happily living with stock CCTs.

One thing I am not sure - I do not think that CCT spring on Storm's breakes because of something wrong with spring or idea, I think it is because camchains too long and loaded for those two long cylinders , and because of that it chain very big amplitude on deceleration/acceleration - both chains driven of same crankshaft, but driving two independent-camshafts cylinders, so smallest de-sync means huge "unsettling" effect on camchains by system feedback.
So, best thing to avoid issue would be to achive best sync between cylinders.

Oops, I got carried away again :) sorry - I like to work with bikes more than ride :)
4 wheels moving body, 2 wheels moving soul
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