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Old 05-02-2011, 05:31 AM   #1
rallyelc4 OP
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KTM lc4 cranks

Hi guys whats the diference between the round crankwebs (eg2004) and the 05+ ones with the cutouts?


While i've got you can you use the black cylinder(02) with the gray bottom end and highflow head?

Cheers guys
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Old 05-02-2011, 08:05 AM   #2
bmwktmbill
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Rally,
You must like mysteries,
I have asked the same question to myself and on the forum and still don't know the answer?

To your question I will add, Who makes the valves and seats for the LC4 cylinder heads?
They are too expensive from KTM!!!
bill
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Old 05-02-2011, 10:23 AM   #3
Tseta
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The newer crank, with the cutouts, has superceeded the older, full circle crank for "all" LC4 applications.

-T
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Old 05-03-2011, 01:09 AM   #4
rallyelc4 OP
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Quote:
Originally Posted by bmwktmbill View Post
Rally,
You must like mysteries,
I have asked the same question to myself and on the forum and still don't know the answer?

To your question I will add, Who makes the valves and seats for the LC4 cylinder heads?
They are too expensive from KTM!!!
bill
I have read somewere that kibble and white has something for us

http://www.advrider.com/forums/showt...=632893&page=5

ha here and it was you

I am keen on some valves anyone else? ,,,You??
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Old 05-03-2011, 01:21 AM   #5
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Quote:
Originally Posted by Tseta View Post




The newer crank, with the cutouts, has superceeded the older, full circle crank for "all" LC4 applications.

-T

T

thanks mate you have a fair few beers lineing up here in oz when you get here

so are the newer ones better? why did they s/s??

btw i did check the online fiche but not good enough


SOOOOOO,,,,,,,

I've got a carrelo rod on its way and have the 04 round crank

what are my options guys?? what would you do
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Old 05-03-2011, 02:02 AM   #6
LukasM
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Quote:
Originally Posted by rallyelc4 View Post
T

thanks mate you have a fair few beers lineing up here in oz when you get here

so are the newer ones better? why did they s/s??

btw i did check the online fiche but not good enough


SOOOOOO,,,,,,,

I've got a carrelo rod on its way and have the 04 round crank

what are my options guys?? what would you do
If you want to keep the bike for a long time and can afford it, I would have the crank lightened a bit and then get it balanced along with the counter balancer to get rid of the vibration the old LC4s are known for. There are three people I know will do good work, GWR in Belgium, Thumper Racing and Cut7 Engineering in the US.

By the way, you know that the Carillo rod comes without bearings and the pin, right?



Here is a KTM stroker crank I had done by GWR. Standard full circle:



After lightening, welding, balancing:

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Old 05-03-2011, 06:06 AM   #7
VxZeroKnots
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My gosh, that is freaking art right there!

RB Designs out of Portland Oregon has treated me well in the past, I'm sure they could do that work as well. http://www.rb-designs.com/
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Old 05-03-2011, 06:35 AM   #8
NICO
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Quote:
Originally Posted by LukasM View Post
If you want to keep the bike for a long time and can afford it, I would have the crank lightened a bit and then get it balanced along with the counter balancer to get rid of the vibration the old LC4s are known for. There are three people I know will do good work, GWR in Belgium, Thumper Racing and Cut7 Engineering in the US.

By the way, you know that the Carillo rod comes without bearings and the pin, right?



Here is a KTM stroker crank I had done by GWR. Standard full circle:



After lightening, welding, balancing:
holy crap, Astro. What sort of scratch did that cost? Did the motor smooth out as well as you had hoped? Must have really helped the beast spin up quickly with that much mass gone.
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Old 05-03-2011, 10:20 AM   #9
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were did you get the stroked arm? i emailed carrillo and they said they only made stock, 78mm.

i spoke to Cut7 a few days ago about my engine and all the things he could do. the big one was blancing and lightening the crank. that and a little head work and it's a whole new monster. not cheap though......

laramie
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Old 05-03-2011, 10:33 AM   #10
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my ones 78mm
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Old 05-03-2011, 10:59 AM   #11
LukasM
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In case that was not clear, my crank is a factory SXS stroker (78mm) for an RFS engine and not an LC4.

If anybody is interested in crank work, you should probably contact GWR (Glenn Woodman in Belgium) yourself to get a quote, but it was much more reasonable than I thought and cheaper than all the other options. His email is woodie (at) skynet (dot) be

GW-Racing Parts (Grosswächter Racing in Germany, not to be confused with the above ) has a stroker pin kit for the LC4 according to their website. I have had a similar kit from them in a SX crank, very nice item. It uses a normal length rod and shorter piston to get the increased stroke. They sell to dealers only I believe, but GWR can get them for you.

CT-KTMLC4-strokeConrod-KitKTM LC4 Conrodkit with eccentric Pin and silver bearing for longstroke342,86
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Old 05-03-2011, 11:18 AM   #12
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My '00 crank was not hardened and when pressed back together would not hold true, had to replace it with a new style crank, which is hardened, So, old crank, kinda sketchy on rebuild, new crank, good to go.
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Old 05-03-2011, 01:52 PM   #13
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Interesting that the GW-Racing conrod has the single oil drain groove per side on the big end like the old LC4 rod, new version KTM ones have 3, you can see the top 2 in this pic, the other one is at the bottom:



Unless I decide to buy/make the equipment to press together a crank myself, next time I do a rod I'll probably get a whole new crank/rod assembly. That should be 90K km away for the 640 though

Cheers
Clint
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Old 06-06-2012, 04:33 AM   #14
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hi im from south africa and have bee a member on this forum for a while now. i have a question that may seem funny, i need links to online shops for a rebui;d on a lc4 adventure, im a bit slow when it comes to this sort of shopping as we dont really do it in africa, please help me with links to cool online shops for shopping the parts i need to do a compolete rebuild on this great bike!!
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