Joined Mar 2002
438 Posts | 0+
SCARBOROUGH, ME.
Decomp Blob weld
Hi, Ady........
Try this link for possible solution other than welding - http://www.husaberg.org/modules.php?nam ... pic&t=1491
then try a search of either Taffy or Dale Lineaweavers' posts on decompression device, auto decomp, or similar threads in the "Mechanical" forum. My recollection is the welded on blob has to be relatively thin, a fraction (.7?) of a millimeter, and must have the correct shape or ramp face to prevent it from being knocked off or holding the valve open.
I'll try digging around in the forums to see what I can come up with.
Also, check the troubleshooting guide link at the bottom of Taffys' posts, and, if it is still there, a hard-start troubleshooting guide http://www.husaberg.org/modules.php?nam ... ***&lid=16 in the "Downloads" section.
Hi, Ady........
Try this link for possible solution other than welding - http://www.husaberg.org/modules.php?nam ... pic&t=1491
then try a search of either Taffy or Dale Lineaweavers' posts on decompression device, auto decomp, or similar threads in the "Mechanical" forum. My recollection is the welded on blob has to be relatively thin, a fraction (.7?) of a millimeter, and must have the correct shape or ramp face to prevent it from being knocked off or holding the valve open.
I'll try digging around in the forums to see what I can come up with.
Also, check the troubleshooting guide link at the bottom of Taffys' posts, and, if it is still there, a hard-start troubleshooting guide http://www.husaberg.org/modules.php?nam ... ***&lid=16 in the "Downloads" section.
ADY
I helped a guy with a 520 ktm. he thought his battery was bad but
after looking over a few things I found that the decomp was worn on
tip. he needed bike for weekend so I had to improvise, I removed the
cam bearing from sprocket side & found a collar that could slide on
shaft behind bearing snug, wich happened to be a spacer from a pair
of acerbis rally pro hand guards,there are too in package they are
those two round units that space guard from bar clamp ok? I cut a
small section from it so it could hold decomp tip at highest point.
Its worked great ever since!!P.S.I should have sold him a knew
decomp just didnt have at the time.
I helped a guy with a 520 ktm. he thought his battery was bad but
after looking over a few things I found that the decomp was worn on
tip. he needed bike for weekend so I had to improvise, I removed the
cam bearing from sprocket side & found a collar that could slide on
shaft behind bearing snug, wich happened to be a spacer from a pair
of acerbis rally pro hand guards,there are too in package they are
those two round units that space guard from bar clamp ok? I cut a
small section from it so it could hold decomp tip at highest point.
Its worked great ever since!!P.S.I should have sold him a knew
decomp just didnt have at the time.
I have done it on my FX470e when one of the cambearings broke. What would you like to know?
Regards.
Regards.
Joined Nov 2004
336 Posts | 0+
North England (Hull)
Thanks Guy's
Boss - It sounds a good idea, not sure it will gain the lift of the exhaust valves though in my 501 setup, probably because i've not understood it correctly. May get back to you on that one...
maichusa - Here goes. Presuming your blob of weld was on the lever part that actually lifts the exhaust valves and not a repair further down towards the body of the auto-decomp -
How big was the blob ie. how high and wide?
What was the method of welding. Stick, or TIG and what rod, was it a special hardened material?
Where exactly did you apply the blob of weld?
Has it been successful & for how long?
Does your engine as a direct result of this blob, now turn easily off the button when cold?
There's a lot of questions there, answer as little or as much as you feel.
Regards
Ady
Boss - It sounds a good idea, not sure it will gain the lift of the exhaust valves though in my 501 setup, probably because i've not understood it correctly. May get back to you on that one...
maichusa - Here goes. Presuming your blob of weld was on the lever part that actually lifts the exhaust valves and not a repair further down towards the body of the auto-decomp -
How big was the blob ie. how high and wide?
What was the method of welding. Stick, or TIG and what rod, was it a special hardened material?
Where exactly did you apply the blob of weld?
Has it been successful & for how long?
Does your engine as a direct result of this blob, now turn easily off the button when cold?
There's a lot of questions there, answer as little or as much as you feel.
Regards
Ady
Hello Ady, in someone's gallery (can't recall who posted it, sorry) there was a picture of it. I welded on the radius from the weight, this radius is lying on the camshaft when the RPM is too low. If you weld here, the weight lets the rod stand up a bit more, I had it up where it stands 0,7mm above the camshaft. I guess any kind of weld would do as long as you have a good burn depth. I used a CO2welder (don't know the correct word for it, it can be compaired to MIG/MAG I guess) Most of the auto garages have these as they are quite easy to have. I welded it about a year ago and no problems since.
Joined Mar 2005
514 Posts | 6+
Sunset desert/ Murray River. S.A/Victoria Australi
maichusa has got it right. This mod changed my 03 FE650 from virtually unstartable on the button, to a never kick it bike. Interestingly enough, this was found already done to a supposedly Factory supplied complete warranty motor. I think the dealer may have got in there at some stage
what i meant was to make the auto decomp stay as high as it canwith collar or blob weld;since berg,s turn over slower. easyer on
parts & will turn over faster.
Joined Nov 2004
336 Posts | 0+
North England (Hull)
Boss,
So did you weld your section of collar to the autodecomp, if so, what kind of weld?
I presume you still had to remove the autodecomp, to do this - or did you?
you said you did it in a rush... tell me more.
I like easy jobs !!
Regards
Ady
So did you weld your section of collar to the autodecomp, if so, what kind of weld?
I presume you still had to remove the autodecomp, to do this - or did you?
you said you did it in a rush... tell me more.
I like easy jobs !!
Regards
Ady
decomp
ady, been looking at the different decomps & by yhe looks of things i would try the 03 650 decomp, it has a higher lift & duration! :idea:
ady, been looking at the different decomps & by yhe looks of things i would try the 03 650 decomp, it has a higher lift & duration! :idea:
Joined Feb 2003
3K Posts | 384+
Escondido, Ca. USA
Re: decomp
But is the 03 650 autodecompression spring and cam sprocket needed also? It appears that the shaft of the autodecompression device where in goes into the cam sprocket may be of slightly (smaller?) different diameter.
BOSS said:
But is the 03 650 autodecompression spring and cam sprocket needed also? It appears that the shaft of the autodecompression device where in goes into the cam sprocket may be of slightly (smaller?) different diameter.
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