DVSK kit on my 650 2002

hultz · Feb 23, 2012

hello !

i am about to mount the dvsk kit on my 650 . but i am a bit confused
on the picture,at the bottom its a spacer, but below that i have somting that look like a "spring retainer" that is located at the bottom of the "head". my question now ? should i remove that and mount the spacer and then the spring ?

regards daniel

gordon123 · Feb 23, 2012

Hi,

You need the spring retaining spigot uppermost and engaging the bottom of the spring. The more important issue is the length of the spring after assembly. Adding or subtracting flat spacers under the retainer will get you to the right spring length.

So what is the right spring length? depends who you are talking to. You can start at the owners doc on the left side of the home page and do a little reading. You will also see that the inside of the head around the springs may need some material removed. This is a must.

The kit may also have come with instructions or go to their website. If the cam you have is a standard one your job will be easier, if the cam is highlift you will need to ensure the spring doesn't close completely or bind. Different valves, longer or shorter stems can also create problems.

I expect some will say there is only one length and this is it. The issue is not quite as clear as that, there will be a small range. If you have the spring too long you will lose power, too short you will damage the engine. treat it as part of the fun of owning a Husaberg but proceed with care.

Good Luck.

bushmechanic · Feb 23, 2012

if you have the spring too long the seated pressure will not be high enough to prevent valve bounce. if it is too short the seated force and peak force will be higher than ideal.

you want at least 60 lbs, safer is 70lbs

which DVSK is it? looks like the oem one, free length of the outer 40.6 - 40.8mm

maximum installed length (of the springs not including the cap or shims) 36.1mm (60lbs)

the minimum length (maximum force) is up to you although if you have the Taffy kit you won't get much choice.

Taffy said:
the seated pressure of the original valve spring is 140LB, the DVSK I supply are on 87LB when compressed to 36mm which is where you want them.

FWIW this has some very incorrect information regarding the oem seated force.

the oem conicals actually have a seated pressure of 72 - 82 lbs when new with stock valves and a stock head. I measured 72lbs with new conicals in a stock head with stock valves. after 220hrs mine were a tad shorter and their seated force was 65 lbs. I reduced it to 60 lbs with no issues.

http://www.husaberg.org/forum/viewtopic.php?f=5&t=11115

http://www.husaberg.org/forum/viewtopic ... 4&start=30

hultz · Feb 26, 2012

update !

i messured all valves today . thay are quite the same (almost 36mm) . its taffys dvsk kit .
have to do some rotary filling in some places ..

regards daniel

bushmechanic · Feb 26, 2012

didn't come with instructions ? taff not answering emails ?

i have one of his kits too its not a bad set of springs but it does not do what he claims it does and it costs more than the kibblwhite sets on ebay. It is like for like very similar to the OEM DVSK that costs only $65 US.

the spring seat that resides in the head should be a minimum of 0.4mm thick and have a Rockwell 2 points less than the springs

gordon123 · Feb 28, 2012

Hi Daniel,

Well you didn't get different lengths, you got poundages. I put a set of Kibblewhite springs in my 650 (they came with instructions and some spacers) but I had to settle for near enough on the length. My bike will never see max. rpm so I went a little longer, hopefully thereby reducing the strain on the engine but not risking valve bounce or too much loss of power.

A great many riders are not able, or do not have the equipment to measure Rockwells or poundages, for those that do, such information is very useful, for ordinary punters like me straight forward is good. Nothing but respect for the enourmous knowledge and experience that guys like bushmechanic have, just think it is aimed a bit high sometimes.

bushmechanic · Feb 29, 2012

sorry

it is a tactful way to suggest that if all things were ideal :? in a DVSK that you may have purchased via the internetz that the kit would not include:

1) zinc plated mild steel washers from a hardware store drilled after manufacture to fit the berg head having a cack handed off center out of round hole in the middle and file marks all over them

2) 0.1mm thick shims for spring seats.

case 1 springs chew up the washers, debris through engine; case 2 local deformation of the thin shim coupled with the valve springs normal rotating action casues palling and damage to the head and alloy flakes through the engine.

Ive tested both scenarios with the said "must have" springs purchased via the internetz

both cases are less than ideal and fortunately do not require a rockwell test rig to nip in the bud :wink:

The kibblewhites on the other hand as you've noted are excellent and don't raise the seated force to 87lbs.

hultz · Mar 11, 2012

hello !

are about to adjust my "valve clerance" on my 650 . is it 0,12 och 0,10 ?

regards daniel

Kayeffess · Mar 11, 2012

1/6 of a turn. I never figured out how to get a feeler gauge in there.

DVSK kit on my 650 2002

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