Kacr - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

 1Likes
  • 1 Post By pdwestman
 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 06-10-2019, 11:04 PM Thread Starter
1st Gear
 
TechNeck's Avatar
 
Join Date: May 2018
Location: Edmonton AB
Posts: 53
Kacr

So mine is loud.... at all RPM, I can hear it over dunlop 10/90 tires at highway speed

Its not the valves, they were redone... and rechecked, its 100% the KACR ticking away. hot or cold, low or high rpm

I don't seem to have power loss, it can reach 130 kph (pretty wound out at that point)

It opens up with little effort with a my fingers, Is this thing going to explode if just let it bang away? WTF is it hitting anyways?

"Life is a series of small victories; connected by strings of catastrophe"
TechNeck is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 06-11-2019, 10:43 AM
OverDrive
 
Join Date: Nov 2009
Location: Lander, Wyoming
Posts: 5,454
At engine speeds of 800rpm & above, the KACR pin is retracted and does NOT touch anything.

If you don't see any rotational marks in the front, back or top of the valve cover and the forward lip of the gasket surface of the head, then the KACR flyweights are Not contacting anything and therefore not responsible for the noise that you are hearing.

May I suggest that your valve tappet clearance is possibly too loose? I've never found a metric feeler set in .025mm, only .050mm increments. So I suggest that one should use feelers marked in one thousands increments only for best accuracy.

Tappet clearances should NOT exceed .010inches on exhausts & .008inches on intakes. This is with SNUG fitment of thickest feeler, because we also need to lift the camshaft with the feeler to take up the bearing slack, especially on the RH end of the cams. Cam bearing clearance can be Plasti-Gauged to confirm not worn beyond normal, specs are .00079 - .0024 inches / .020 - .062 mm. Maximum camshaft bearing clearance is a very sloppy .0059inches / .15mm.

Or simply try one size thicker shim on both the RH intake & RH exhaust valves than what you currently have in the engine.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting

Last edited by pdwestman; 06-11-2019 at 10:46 AM.
pdwestman is offline  
post #3 of 7 Old 06-11-2019, 09:12 PM Thread Starter
1st Gear
 
TechNeck's Avatar
 
Join Date: May 2018
Location: Edmonton AB
Posts: 53
I have a metric feeler set (canada)

ive triple checked it now, valve shims are good, short of running the engine with the cover off to diagnose WTF the KACR is hitting , i'm not realy sure what to do.

If it's hitting the cam cover is it a big deal? that doesn't seem like a fixable problem anyways.

this vides is pretty good for hearing it


"Life is a series of small victories; connected by strings of catastrophe"

Last edited by TechNeck; 06-11-2019 at 09:28 PM.
TechNeck is offline  
 
post #4 of 7 Old 06-12-2019, 03:04 PM
OverDrive
 
Join Date: Nov 2009
Location: Lander, Wyoming
Posts: 5,454
Sounds normal with max valve clearance + to my ears.

If you could not see any evidence of KACR contact with the cover or the head, it is NOT the KACR making the noise.

Slow your idle speed down until the KACR does make noise, then you will know what it sounds like.

Maybe replace your exhaust header gasket.

But I'll still suggest TOO Loose of tappet clearances.

I record tappet clearances as such,
< .009" / .009" / > .009"

I'll gladly take a < .010" on an exhaust tappet or a < .008" on an intake tappet. But one is better off changing to > .008" on an exhaust tappet than accepting a .010" or worse a > .010" and having a finicky customer whimper about 'tick, tick, ticking'.
DPelletier likes this.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
pdwestman is offline  
post #5 of 7 Old 06-12-2019, 03:27 PM
4th Gear
 
Join Date: Aug 2010
Location: Kelowna, B.C.
Posts: 2,314
I'd pull the VC and see if there is evidence of contact; if not then the KACR isn't your issue as Paul said. FYI, many people have removed the system entirely and most reports suggest minimal to zero consequences as a result thought there are a few that noted harder cold starts. Lots of reading on a Google search of the subject

Dave
DPelletier is online now  
post #6 of 7 Old 06-12-2019, 08:19 PM
OverDrive
 
Join Date: Nov 2009
Location: Lander, Wyoming
Posts: 5,454
The louder clatter that I hear as the revs increase on the video is possibly from the exhaust heat shield or reverberations from metal skid plate or crash bars, IMHO.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
pdwestman is offline  
post #7 of 7 Old 06-13-2019, 12:09 AM Thread Starter
1st Gear
 
TechNeck's Avatar
 
Join Date: May 2018
Location: Edmonton AB
Posts: 53
no crash bars on this bike lol.... just a lot of fiberglassing

If this seems normal then i'll keep riding, what's the worst that can happen lol?

valve clearance are on the tall side of things near max, exhaust is between .25 and .22 and intakes are between .16 and.20 which is good,i get max time before bang out of the valves, requiring re shimming.

I just didn't think they would be so noisy lol.

"Life is a series of small victories; connected by strings of catastrophe"
TechNeck is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki KLR 650 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome