Very important for the 1999-2008 Husabergs. BUT it does fit All models, All CC, All years. Replaces the single conical spring 1999-2003; 20021001 and 2004-2008; 59436028044
These are DVSK to our design. They are slightly stronger than the kibblewhites. Both types have light valve bounce at the redline with the 53, 55 and 5521 cams

You can actually feel the difference in performance.

The biggest benefit From This Dual Valve Spring Kit is that they are reliable.
OEM 'conicals' can break and the damage can be nothing and just poor starting or a "destructo" engine.
The next advantage is that they give the Cam Follower bearings an easier time,
they give the Camchain an easier time,
the tappet pads don't cup,
the valves won't 'tulip'
the stems won't dome
and the Cam bearings won't collapse!
The kit is for all 4 valves and comes with details on getting the 'installed height' right (the compressed length of the springs).
The 2004 engines are a straight fit, those before need a little rotary filing
The head should be removed ideally for this task and if the engine has been thrashed at all - look for tuliped valves.
Later 2007 & 2008's are having broken valve springs or spring caps,
they are distorting the stem of the valve.
Rare? Try 3 in a week in early September 2010!
So don't look at this kit as 'just for show': they are an important retro-fitable piece of kit.
Helping in every single facet of your bike. They'll make it sound quieter, create less heat, less wear, help save power (or gain it if you prefer!), they are an OEM part so they aren't going to let you down and with our clear instructions anybody can take the task on!.
Here is a tribute from 'Jockular', he was the first customer to try the kit in 2008 and since then i have sold about 250 kits and had no problems:
I found the instructions clear and precise and easy to follow. "I now have my new double spring set up installed to my 550, its definately quiter running and tick over is rock steady, i'ts never run so sweet. It runs quieter as you say and it ticks over real nice now, which it never did before, i've even been able to drop the tick over speed. And later: wehay, bike held together for the four hour enduro at the weekend, ran flawlessly, i would have to say that the double spring set up is a success, it has so much torque its unreal."
Neil Gliddon from Australia said "I have just come back from first short ride,YEE HA. Every thing you supplied fitted spot on,its running better than it ever has. Nice smooth tick over without the once harsh clatter of valve gear. Also STARTS so easily now even from cold ON THE BUTTON. I look forward to getting back on it for proper ride. So this is just a note to say THANKS TAFFY"