Aaaaarrrrrrrggggghhhhh, I'm at a loss...HELP!!!

**Macktheknife** · 19th July 2006, 15:38

Originally Posted by Motu

.I'd go for a bent shaft or a flat in a bearing ball - y.

That would be my pick too

**R1** · 19th July 2006, 15:44

Originally Posted by beyond

Did the knock go away when the clutch was pulled in??

.

na nothing I do makes the knock go away...

Originally Posted by Motu

lay the bike on it's side

I did try that, the noise duznt change...

Originally Posted by Ixion

No witness marks anywhere I take it?

Narda, zip, zero, nuthing, no circlips...I will spend some more time checking the bearins in the gearbox....
but as you say it's just one of those piggy things...
I refuse to put it back together without finding a problem tho...

**Paul in NZ** · 19th July 2006, 16:14

summat odd like a fuel pump or a power valve?

throtle slide rattling?

**Motu** · 19th July 2006, 16:48

You are working yourself into a corner with denial.I see this often with my mechanics when they are working on a problem - ''I've checked everything,it can't be this and it can't be that,I've double checked this and triple checked that''.They can't see a way out of their problem,the dispair feeds upon itself - I know,I've done it often myself too.Then some arsehole like me comes along and says ''Oh,look,the wotchamacallit is loose''.

Stand back,divorce yourself of the problem and clear your mind - come back as if you've never seen the bike before.

**Brett** · 19th July 2006, 17:50

Originally Posted by Motu

You are working yourself into a corner with denial.I see this often with my mechanics when they are working on a problem - ''I've checked everything,it can't be this and it can't be that,I've double checked this and triple checked that''.They can't see a way out of their problem,the dispair feeds upon itself - I know,I've done it often myself too.Then some arsehole like me comes along and says ''Oh,look,the wotchamacallit is loose''.

Stand back,divorce yourself of the problem and clear your mind - come back as if you've never seen the bike before.

Shit mate, as Motu says, remove yourself and try from that angle. You have checked virtually everything, you must have missed something, even something like a single flattened ball bearing could make quite some rotational knock.
This has now gone beyond my mechanical expertise, so hope you sort it out!

**cowpoos** · 19th July 2006, 17:56

Originally Posted by sugilite

is the knock coming from the clutch area of the motor?

was my next question...if you do alot of wheelies the spring and guides rod thingies in the clutch could be a tiny bit lose...same thing happened on a old trial bike I owned...I took the side cover off...and just grapped the clutch basket and jigged it backward and forward and it produced a small movement...took the clutch off...replaced the side cover....started the bike...noise went!!!... could be the same??

**Sensei** · 19th July 2006, 18:05

Sorry cann't read all post but does it knock when idling or when you are rolling

**imdying** · 19th July 2006, 18:15

Sounds like some of us should roll round and spend a night gently spinning every gearbox bearing as carefully as possible

**2much** · 19th July 2006, 18:32

The way I understand it is that it had the knock before the clutch blew, is that right? if so, when and how did the knock start (ie: did it start very slight and get worse or has it been the same since it started?

I would probably try getting the whole crank/flywheel/clutch setup balanced together and see if that helps.

**merv** · 19th July 2006, 18:44

When the clutch blew you wouldn't have over revved the engine would you? No reason for it, but .....

Any sign of damage to a piston crown? I'm wondering about a stretched rod or something allowing the piston to knock on the head.

**DingDong** · 19th July 2006, 18:59

... like a gudgen... I'll just wait for my bling now....

**The Pastor** · 19th July 2006, 19:26

Have you checked the tire pressures?

**nadroj** · 19th July 2006, 21:27

If you can feel it through the bars you should feel it with plugs out rotating the engine by hand. I would suspect something around the clutch basket area catching every revolution or a fragment of old clutch jammed in somewhere doing the same. Good luck!

**R1** · 19th July 2006, 21:28

Originally Posted by merv

When the clutch blew you wouldn't have over revved the engine would you? No reason for it, but .....

Any sign of damage to a piston crown? I'm wondering about a stretched rod or something allowing the piston to knock on the head.

It,s got a rev limiter that it hits all the time, and it should be sweet to do it, the piston crowns all look mint, as Motu said I think I know I have checked evrything, I'll atack it from a new angle on the weekend..

Cheers for all ya help guys