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March 13th, 2015, 12:43 AM   #81
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Originally Posted by hacker33 View Post
I am also happy with KTM DVSK. In my 450 they work fine.
So do you exprience valve floating on high revs?
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March 13th, 2015, 01:43 AM   #82
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Originally Posted by Blamir View Post
So do you exprience valve floating on high revs?
I don't know anything about the valve floating because I can not see them when I ride
I don't have tachometer so I don't know how high the motor revs right now.
I like to ride at high rpm's and did not notice anything wrong.
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March 13th, 2015, 03:56 AM   #83
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Just to clarify;

nobody has anything to worry about with any of the dual springs available if they are installed in a stock head 04 up with stock valves

they all have adequate seated force (more than 60lbs) to prevent valve issues

the Kibblewhites want 7mm preload or a tad more (0.1 -0.2mm) for 75 to 80 lbs seated. installed height as per instructions (attached) is 1.170"-1.180"

if you require more than 10500rpm and suffer internet induced anxiety just use the additional spacer under the main thick Kibblewhite lower spacer, its OD locates in the head recess and the thick spacer locates itself on the valve guide, (see PDF instructions below) the KW springs with the added preload will still take less power to run than the others

the lowest force you will get out of Taffys in the same head is 76lbs with a 0.1mm shim (bad idea)

the ATV set is 80lbs seated

the oem conicals are 72lbs seated

In case its still isn't clear they are all about the same seated and are all perfectly adequate for the job except for the oem single springs which often break near 200hrs

the difference is in power required to run them (kibblewhites win) and pricing is the main difference between the other 2 dual sets

Item # 96-96000, Lightweight Racing Valve Spring Kits for KTMŪ All RFS Engines 450cc-525cc 2008-2009 On Kibblewhite Precision Machining

cheapest usually on ebay search for kibblewhite 9696000 http://www.ebay.com/sch/i.html?_from...696000&_sop=15

Last edited by bushmechanic; April 3rd, 2015 at 10:56 PM.
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March 13th, 2015, 05:07 AM   #84
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Thanks!

A minor followup question: Is there any drawback to the 7mm preload? I don't expect it to be but good to have it confirmed
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March 13th, 2015, 09:56 AM   #85
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I do not have so much free time on my hands that I can keep up with all threads, or even being able to contribute when I feel it concerns a field in which I have made lots of mistakes (so called experience). So when I finally stumbled over the interesting subject of valve springs, I had to read it! The subject of mechanical springs is very wide and somewhat complex. This thread only partially concerns the theory behind the design, measured physical specs and proven results. Harsh words and humiliations took however this promising thread to a level unworthy of UHE. So I just wanted say I'm a little sad over this, and I hope professionalism and a humble tone will return to the forum.

I have used both OEM springs and special PAC-springs.

Yours Dr_C, allways on the technical barricades, eager to learn more!
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March 13th, 2015, 10:37 AM   #86
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Thank you. I will take this to heed.
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March 14th, 2015, 02:58 AM   #87
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Hey a question - what is the field of engineering theory called that valve springs fit under? And can anyone recommend some reading material? Academic stuff from engineering welcome if you have it!

Probably there's something on valve springs in Tuning for Speed and other stuff that's been recomended before - will probably appreciate / get it better now

(While it can be tricky to read general material from an academic discipline that one is lacking a background in, it's good to try to dig into the maths/theory/ideas of a field that is already on the mind amd being puzzled over)
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March 14th, 2015, 11:58 PM   #88
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Here is one source:

http://www.amesweb.info/MechanicalSp...lculators.aspx

For more in depth discussions, specifically concerning the application we are interested in, you may find some useful threads on the topic in the forum "SpeedTalk".
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Last edited by Dr_C; March 15th, 2015 at 12:02 AM.
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March 15th, 2015, 01:25 PM   #89
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There is a dual spring kit on 2005 spare catalog. It is about 155euro. Anyone has info about this?

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March 15th, 2015, 01:36 PM   #90
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Originally Posted by Blamir View Post
There is a dual spring kit on 2005 spare catalog. It is about 155euro. Anyone has info about this?
read the first page of this topic
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