bad sound.....

Is it a tickig type noise? Do you have the EXUP valve? Is it only at idle/neutral?

 

Hmm knocking sound. Well I haven't experienced exactly that but I was at my mechanics and was complaining about how the bike operated on idle, not look it used too. So he had a look and told me one of the carbies is blocked up a bit.

I think it may be something similar in your case. Carburettor cleaning will set you back about $200. <!-- s --><img src="{SMILIES_PATH}/icon_cool.gif" alt="" title="Cool" /><!-- s -->

 

Most likely the exup valve bushes. To check it just take the cover off the exup valve, start the engine and the grab hold of the pulley that the exup cable attach to.

If you wobble it around firmly and the noise stops you have found the problem. Nothing too serious. Sometimes tightening the cables will help the noise.

There is a HOW TO somewhere on this site showing the method of bush replacement

DAVE

 

Could be many things including: carb sync, valve adj, EXUP Valve, cam-chain tensioner, starter hyvo-chain, even clutch.

I just try to start with the simplest and easiest things to check and fix first.

How does the bike perform?

 

That's a new one to me!

 

If the bike is running, this chain is moving. Just like the cam chain. 95% of the time it is something else.

 

It's really amazing when, after one starts feeling comfortable with their knowledge of how a bike works and what is in them, you learn about a part that you never knew existed!

 

I'm going to stick with what Dave said. EXUP Rattle.

You can learn to live with it or, chase that elusive lubricant that will withstand the abuse of opening and closing that much in a high temp eviroment.

One last question... Is it more noticable when it is cold or warm? Or all the time?

 

As has been suggested in other threads regarding EXUP rattle; for starters you can difinitively make sure its the EXUP by wiring it open for a little while. If the rattling instantly goes away... well theres your problem.

In terms of eliminating the rattle... i'd recommend that you start by cleaning the EXUP valve as best you can. After that, lube it thoroughly with something that's gonna stand the extreme heat (sorry no suggestions). Then look into replacing or adding to the washers (?) that are meant to keep the exup in place.

Mine rattles a bit at idle, but as soon as i lift the revs to about 4k rpm it stops. I've learnt to live with it, but its certainly on my list of things to tend to eventually.

 

same as mine, it just started the noise the other day, only does it when she is cold, i thought it was a bad batch of fuel but i rekon its something to do with the valves, not the exup because that already makes a noise, piece of sht. i love my bike

 

Just a suggestion for the lubricant..I know bearing grease is a high temp grease thats used up to something like 150-200 degrees??

Might be worth looking into that. You can buy that practically anywhere. Im not sure what sort of lubricant u gotta use coz I never had exup on my 2kr. If it was me id just chuck some apple flavored stuff I got at home <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: -->

 

I'd think that the header gets a little bit hotter than 200 C (400 F) molybdenum grease would probably be best. Or graphite maybe.

 

I might be being a little presumptuous, but isn't a hy-vo chain an alternative style of drive chain, that doesn't use rollers in the joints. The joints are instead rocking pins and thus they do not have the sliding friction of a roller chain...

Unless you mean some kind of hy vo chain in the starter, like.. some kind of chain used to help start the motor or something? Didn't know about that.

Thats sort of off-topic. I have this sort of clacky rattle at low rpm too. Most noticable if you rev it to 6k in neutral, then let it drop real fast to idle. Not really worried. Might look at this cam chain tensioner thing tho.. Don't want ANY problems with the cams.

Anyone want to post a how-to for such a task?

 

Copper or silver anti seize will get you outta trouble whenever you need to grease something that gets extremely hot. If you guys are tooling on these bikes regularly you should be using antiseize on every bolt you touch. It helps lubricate the threads and allows for a more accurate reading from the torque wrench. And next time you remove it you won't have to break the corrosion.

 

I had the same sort of noise a few weeks back and it turned out to be the cam chain tensioner spring. They didn’t even charge me to fix it either, which was a welcome change. Noise is gone so I am happy.

 

Does anyone know what is involved with checking the Cam belt tensioner thing... because my bike makes a knocking sound when idling.. its also more noticable when the bike is cold. my father said it sounds like something to do with the cam belt... I will have a look and see maybe its the Exup


I let the bike idle and listened to the Exup Valve but the sound seems to be coming from middle section of the engine.. and when i rev it the sound disappears

 

Yep, sounds like the cam chain or tensioner to me. It is exactly the same as what mine was doing.

Getting to the cam chain is a fairly involved process and if you don’t know what you are doing it can be worse. That is why I took mine to the mechanic. He originally thought that the chain and tensioner needed replacing and I booked it in to be done on his advice. I think he felt like a bit of an arse so didn’t charge me when it wasn’t the problem.