Low revs rattle?

Could there be a loose header pipe? Check around there might be something with just enough play in it to cause the noise. Sound like metal on metal or something tapping? Radiator might be touching. Can be hard to track down, rubber spacer gone. A few ideas. Hope this helps.

how many hours on the motor ?

Is there any chance that it's the drive chain rubbing on the frame?

take note, if it sounds like something tapping on the exhaust pipe as indicated in some of the mail stop riding immediately!!! Check the roller rockers. That noise is a sure sign they are warn and if left any longer the rockers will crack and come flying out the cover.

The noise to watch out for is like a spoke tapping on the headers. You can easily check by taking off the tappet inspection cover. If the tappets are loose then that is it and you have saved youself from a 4 grand disaster.

On the bright side if the tappets are not loose, then it may just be the husaberg wearing in. Did you have a two stroke before.

Sorry to alarm you, but I have heard a sound before twice on bikes that went amazingly well, but I towed them back with holes in the rocker cover!!!!!!

It seems part of the problem is having the tappets too loose that causes the hammer affect that weres the axle in the roller. You should check the rollers once a year even if no loose tappets. If any rough feel when rolling them with your thumb, replace before they get loose.

Let us know what you find out.

husaberg rider since 1992, and yes it was cold in rofors, and yes it is true they do have blondes in the factory/ warehouse.

fe600racer said:

It seems part of the problem is having the tappets too loose that causes the hammer affect that weres the axle in the roller.

Click to expand...

Excessive valve-train acceleration as a result of the OE concave flank camshaft is the root of said evil. The calculated Hertzian loads are very scary indeed.

Dale

It may or may not be simply fate, that this thread was next to the cracked primary gear thread. !

You were describing a rattle or knock sound at low revs, but if I read correctly, that it only happened on acceleration. Could it be spark knock or detonation from lugging at too low an RPM. Just a thought, but these bikes will chug and jerk pretty badly in these conditions. At any rate, follow the earlier advice given concerning the rockers and camchain.....possibly the noise is always there and you can only hear it while the described conditions exist. I personally havn't had the rocker failures described by the others, so I don't know for sure what your noise is. Good luck, DC 8)

HI there, well Dale's explanation is probably right. Has the noise been like that all along or has it only started recently?

If you ride with ear plugs you can actually hear the motor more as the plugs filter out the exhaust noise...try it.

If it is a new noise, it may be worn rollers on the rocker arms. When you mentioned loose header that is the noise someone described when their rollers were worn and half an hour later bang and hence my concern.

Noises are hard to pick, if the they have been the same all along, maybe it is just the husaberg run in regular sound. If a noise is new then you need to look a bit deeper.

The best way to see if the roller bearings on the rocker arm are worn is to take of the rocker cover and see if they are loose on the roller axle. An easy way is to see if your tappets are loose from last time. Tappets usually tighten as the valves bed into the head so if they get loose that is an indication.

Bergs are very reliable. Early bergs had quality control problems with the parts and it was that, not the design that caused most of the problems.

I usually get 30,000 Km of hard single track and fire road riding out of bergs and all I do is check the roller rockers, change airfilter, and oil regularly and use very very good oil. The major cost of owning a berg I have found is the cost of replacement tires?!

Riding it like a two stroke might cause problems or need more maintenance.

I have towed two bergs home over 100km each time behind my 600 berg,not that much fun. One had worn roller and it caused the rocker arm to break and go through the rocker cover. Another one was when the guy had a good idea!!! of replacing the bearings in the roller with a brass bush....worked really well till it did not. The same guy thought he would adjust the timing advance to give a bit more grunt and this was before bergs had the slip cog to allow backfire so ....... Standard is good.

let us know what you find?

What grade gas do you run as well? Do the valve check and adjustment if needed. I agree with the other posts but need to point out also that some engines are noisier than others. If that doesn`t cure it or you still can`t find the rattle, then something is vibrating at a certain rpm witch means something is loose. Try to find it, easier said than done :lol: , if you can`t either ignore it and ride or sale later on. I think I muddied the water enough. Good luck.

I know I'm picking up a real old thread but I'm hearing something different after adjusting the valves.
I got 147hrs on my 05 FE650. Cam chain has been replaced at 120. I set the valves at 1/6 out. It had been
around 20hrs since the last adjustment and they really werent that far off.
So put a new plug in also and back together. Fired it up and I'm hearing a tapping. Not the valves which are a
light ticking i'm used to, but a little louder than that, like a clicking/tapping if that makes sense.
And just when cold. After a few minutes it goes away after the motor warms up.
OK, so I thought I set the valves wrong. So I took it apart again and checked the gap. All OK.
Start up and same thing. After a few minutes, it goes away when warmed.
I willing to replace some warn parts, like rollers or whatever, but would like to know some thoughts as what
it is.

pollo

It could be the cam followers i have to replace mine after c.a 100 hrs.
It faild on mine after about 130hr and my friends 550 after around 150hrs.


Regards

Well, I should of checked a few more things before commenting.
Like one of my header pipes!
Yep, the smaller header pipe was rattling around.
I'm happy it was a quick fix.

pollo