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December 23rd, 2014, 12:10 AM   #11
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Hi JG

you can buy a jetting kit without the PS in it which will reduce the cost a little.

the boyesen quick shot is a waste of money but no matter how many times you say it people don't believe you.

the needle in my kit has 4 angles to it so where as a single needle made by keihin may be as good in one area, my needle combines the best of them all.

don't use a JD kit though....

as for the dual spring kit, my kit is softer than the factory DVSK but not as soft as the Kibblewhites. but you get instructions and support.

I tried the KWs first here and they are really good, I did strip an engine with KWs and see some marks. I'd be interested to hear if anyone else has had this?

regards

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December 23rd, 2014, 12:54 AM   #12
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The bore has some scars in it. It must have pulled in a few grains of sand at some point.
Have a look at the piston in the same spot as the grove, just above the top ring, you may find a small steel ball imbedded.
The sort a mig welder spreads around.

I had the same thing, and believe it was from welds done in the air box when the bike was manufactured
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December 23rd, 2014, 01:23 AM   #13
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I see this debris and scaring all the time.

it could be many, many things but if yoiu get rid of the high points then I feel you have nothing to fear!

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Taffy
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December 23rd, 2014, 10:26 AM   #14
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Originally Posted by JGBerg View Post
I wasn't planning on it. Is there a problem with the stock springs?
Yes. The conicals fail. It's not an if question, it's a when question. Some get lucky and the only issue is a spring replacement. Others, well . . . bent valves is the least of their problems. There's little to no warning. It just goes. Mine went at idle while just after an oil change so I was in a good place to shut it down fast and diagnose the problem. I've known others that were not so lucky.
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December 23rd, 2014, 07:06 PM   #15
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Originally Posted by Taffy View Post
Hi JG


as for the dual spring kit, my kit is softer than the factory DVSK but not as soft as the Kibblewhites. but you get instructions and support.

I tried the KWs first here and they are really good, I did strip an engine with KWs and see some marks. I'd be interested to hear if anyone else has had this?

regards

Taffy
to clarify taffys claim here the difference in force between the KTM oem DVSK set and his set is due the thickness of the lower spring seat not the spring rate.

the actual springs are for all practical purposes the same rate as they have the same coil count overall length and wire diameter.

the oem lower spring seat is a quality hardened steel seat of adequate thickness while taffys supplied a 0.1mm thick shim to go under his springs.

the difference in force from doing this is 4lbs or approx 5%

the kibblewhites are about the same price as taffys and much much better, the springs themselves weigh less as well as being a much lower spring rate, the upper spring seat is titanium, they can handle more valve lift before coil bind and most importantly they are short enough to be installed at a length that actually reduces the forces over the oem conicals.

support? that's another load of bollocks, I asked him why his springs I was installing were too long to reduce seated force over OEM and got told I was being far too anal.

marks in a kibble white valve sprung engine ? never heard of it. what marks are they old cock ? ball pein hammer marks from disassembly LOL
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Last edited by bushmechanic; December 25th, 2014 at 12:12 AM.
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December 23rd, 2014, 10:01 PM   #16
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Do the conical springs from the '09+ Husabergs break?
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December 23rd, 2014, 11:12 PM   #17
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Hi JG

I supply 0.2mm base shims in silver steel.

Taffy
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December 24th, 2014, 12:05 AM   #18
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ok so with taffys new 0.2mm thick shims (still too thin to distribute the load nicely) the difference in seated force is approx 3.5lbs

this amounts to 4.3% less seated force and 1.5% less peak force than the ktm duals
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December 24th, 2014, 12:14 AM   #19
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Originally Posted by JGBerg View Post
Do the conical springs from the '09+ Husabergs break?
never heard of it on the inermnets

also FWIW the KTM RFS engines don't have an issue with their conical springs that came out after 2002 - 2003 (same part number as ours) not sure why but they do have a 1mm oil jet spraying cooling lube into the rocker cover.

since the most common spring to go in the bergs is the RHS exhaust valve you have to wonder if it is temperature related.
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Last edited by bushmechanic; December 24th, 2014 at 01:32 PM.
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February 19th, 2015, 06:05 PM   #20
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She's finally coming together!







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