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Auto decompression shaft 05 vs 04

H

Husa98

Joined Jul 2002
201 Posts | 0+
Zwiesel, Germany (Bavarian)
is there any difference?

I can´t find the spareparts manual from the 05, no download at www.husaberg.se available....

I would buy one for my 2001er as a answer to the problem of the hard e-starting ...
 
Husa98,

The Husaberg Parts Manual for the 04 and 05 show the same part number for the Auto Decompresson Shaft 590.36.016.000. This is a KTM part, used in their racing 4-stroke line.

You can get it from KTM World, on line, for $22.51 US, at the following address.

http://www.ktmworld.com/

I do not know if it will fit Husabergs other than 04 and 05.

Regards,

Joe
 
You may need to replace the cam chain sprocket and cam with 05 versions to make it all work.
PM BOSS of this site for details as he has done this in the past on Bendbergs bike however his is a non e-start model.
If you attempt this you will be the first.
Please let us know how it goes.
 
I have forgotten to tell you my 01 is updated to 03 including that the steel camshaft sprocket, camshaft, rockers.

You have dashed my hope, because I have still changed the decompression shaft to a KTM !

The shaft was not new, because reconditioned.

And the motor starts sometimes, mostly not.

When this is the same as the 05 husaberg part, what remains to be done for a higher e-starting speed???

Remember:The e-starter mostly does´nt turns the motor round.

By the way: I cant see the pictures from BOSS

husa98
 
recondition? I think a wrong word from my translater. sorry

The shaft was a little used.

My owner told me better starting with it..

But I have read about trials by welding here.
 
No problem with your translation Heir Husa98 :)

The shaft is a wear item. It may be part of the problem. Before tearing into the motor you may want to check the valve adjustment. A little tight is better than a little loose a far as e-starting is concerned.
 
The valve clearance is 0,12 mm for In- and outlet.

I have a good experiance with it since my old 600.

For better handling I have made a special tool like the porsche tool I have seen here at UHE

I will try the 1/8 turn method.

Which are the most critical? In- or outlet valves?
What do you think about outlet 0,12mm, inlet 0,10 mm?


One reason I think is the clearance of the shaft.

The contact surface of the shaft with the roller goes in under pressure.

I think about to make a bushing for the shaft.
 
A bushing on the shaft seems like a very good idea!

The autodecompression device spring seems very weak to me. If the bushing caused any drag you might defeat the purpose.

A stronger spring could help also but I have no way to test or verify it.

Does your machinist friend know anything about springs? :)
 
On my 01 470 the autodecompression spring was installed incorrectly from the factory. The bike is slowly going back together and I will post the final results in the future but.................

the 01-02 original replacement device I purchased would not fit 8O It has a detent to hold the spring whereas the original has none.

It appears to be a KTM product. I went with the original shaft as it could not have been worn as it never worked.

There are definitely some parts labeling issues at work here.
 
husabutt said:
A bushing on the shaft seems like a very good idea!

The autodecompression device spring seems very weak to me. If the bushing caused any drag you might defeat the purpose.

A stronger spring could help also but I have no way to test or verify it.

Does your machinist friend know anything about springs? :)
Click to expand...

The spring is supposed to be light to allow the counter-weight to move as soon as the engine starts. However, if it isn't engaged with the shaft correctly, there's no way the starter will spin the motor! :doh:
 
The shaft has a nut to fix the spring.
One turn more presstressing of the spring an she slides over the nut - so impossible.

But I put it into question, if the spring is so straight to hold the decomp. inside until 800 rpm!

Reputed this is the speed who must be available of the first spark by SEM Ignition
 
Since the 04-05 models e-start flawlessly it would be interesting to compare the tension between the 04-05 and 01 spring :)
 
On my 05 FS650 I have found that by using .10mm or .09mm, instead of the stock .12mm value, for the exhaust valve clearance it helps the autodecompressor get enuf valve lift to give the e-start work better working chance.

Is there a method for increasing the lift of the auto-decompressor so the stock .12mm valve clearance can be used?
 
@husabutt:

Attention: My FE 501 have (as the rusult of rocker roller damage) the 03 camshaft with steel sprocket.

My dealer sold me the KTM decomp shaft and the fitting spring.

@super...

0.9mm valve clearance at the exhaust valves.....goes that well??????
I´m afraid
 
Husa98 said:
The shaft has a nut to fix the spring.
One turn more presstressing of the spring an she slides over the nut - so impossible.

But I put it into question, if the spring is so straight to hold the decomp. inside until 800 rpm!

Reputed this is the speed who must be available of the first spark by SEM Ignition
Click to expand...

I think you may not have the spring installed correctly, there is not a 'nut' to fix the spring.

Please view the 5 pictures on Husadawg's excellent presentation of the 'Auto Decompressor

http://www.husaberg.org/modules.php?ful ... _photo.php

Regards,

Joe
 
Sounds like from reading through all this the 04 and 05 decompressor is the same, but if the one in my 03 wears out still not quite sure if an 04-05 unit will be a direct replacement with improvements?
Dan
 
The easiest way is to request a gallery and upload them here. Then when you open the picture right click, go to properties, copy the address and paste the address after you click open the image icon in the new post area.
 

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