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Old 08-30-2003, 01:35 PM   #1
MotoJim OP
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Another KTM 950 EPC Fix

Attached you will see a screen capture of part of the KTM Repair manual which talks about how the epc works in 2nd & 3rd gears.
Instead of messing with the tubes running to the carbs a more simple solution is just unplugging the epc's and maybe sealing the female connection on the epc with silicone to keep it from the elements.

The front epc is found though the opening in the tank on the right side just above the oil tank along the frame. The rear epc is below the seat behind the airbox.

The last line of the section is the key data:

Note: If the epc valves are disconnected, this will not influence the other systems.

ciao,

JimR
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Old 08-30-2003, 06:32 PM   #2
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any difference in power

Did you disconnect the wire ? Any difference in power in 2 and 3 third gear ?

Stephane
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Old 08-30-2003, 07:12 PM   #3
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Re: any difference in power

Quote:
Said vgstef:
Did you disconnect the wire ? Any difference in power in 2 and 3 third gear ?

Stephane
I did disconnect the connectors for both epcs. I haven't ridden the bike yet because it's raining cats and dawgs right now. Maybe tomorrow.

I'll let you know.
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Old 08-30-2003, 07:55 PM   #4
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Im acronym impared...what's a EPC?

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Old 08-30-2003, 08:19 PM   #5
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Quote:
Said Gerg:
Im acronym impared...what's a EPC?

Greg
I'm not sure what EPC stands for but it's basically a solenoid, an electronic device that opens and closes a valve, which limits the amount movement of the slide in each carburetor, based on the vacuum available. It reduces the amount of vacuum over the diaphram in each carb to keep the slide from opening up as fast.

Jim
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Old 08-31-2003, 07:15 AM   #6
Renazco
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Jim, did it stop raining yet? I'm curious to know if you noticed an improvement with the disconection..
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Old 08-31-2003, 08:17 AM   #7
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Quote:
Said boejangles:
Jim, did it stop raining yet? I'm curious to know if you noticed an improvement with the disconection..
A Big No!

We've been in a severe drought around Kansas City and we have had two straight days of heavy rain. There's localized flooding with some roads closed.

They shut down I-35 south of Emporia, Kansas yesterday because water was forcing cars off the interstate.

Maybe tomorrow, but today I'm trying to keep my basement from flooding. Window wells are filling up and waters coming through the windows. Great fun!


WetMotoJim
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Old 08-31-2003, 12:56 PM   #8
Renazco
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Put the 950 on the roof! Just kidding hope everything works out good for you guys.
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Old 09-02-2003, 05:19 AM   #9
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Thumb

Keep us updated on your EPC experiment Motojim. And stay dry!

Goss
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Old 09-02-2003, 03:49 PM   #10
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My dealer just unplugs them. He pointed out the plugs when I first picked the bike up and said disconnect them if you want, if not we'll do it at the first service.
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Old 09-03-2003, 05:35 AM   #11
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But still the question is Human, can you tell the difference ? If not I see no reason to do it. I don't have enough miles on mine to try 2nd and 3rd gear full throttle fun yet so let me know.

Goss
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Old 09-03-2003, 09:46 AM   #12
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Well... You are driving me crazy with EPC (Electronic Power Control???)....

I have just been out in the parking lot, unplugged the two things, and I am about to put on my jacket, gloves and helmet and commute back home (70 km....).

Let's talk about the "kick in the pants" effect later in the evening (ahhh... time zones effect: good evening for me... good morning for you guys on the other side of the pool...... )
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Old 09-03-2003, 09:56 AM   #13
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SOMMER KTM give to me two little plastic plugs to put on the carburators and take off the tubes...

it's that the bypass for EPC?

x Maurizio

spiegamelo in italiano così capisco cosa hai fatto... grazie:):

la bestia è incredibile!!!!
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Old 09-03-2003, 11:09 AM   #14
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Quote:
Said Goss:
But still the question is Human, can you tell the difference ?
Yes! :):
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Old 09-03-2003, 12:37 PM   #15
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Here I am....

You can feel the difference, ohhh... you can feel it!
With the EPC disabled, the bike has a complete different feeling in low gears: it seems somewhat less responsive at low RPM, but it doesn't feel "strangled" in second and third gear at about 6000/7000 rpm (I can tell this as I have plugged the EPCs again, and it behaves in a different way...).
You know: twist the throttle on the stock beast in first gear and it power wheelies; shift first/second at about 6500/7000 rpm and it tries to wheelie... Open the throttle in second gear and it pushes and pushes, but seems to be too heavy or too long to wheelie...

Unplug the two EPC controllers, and it power wheelies in second gear: open the throttle (not so hard if you are not wearing a back protector equipped jacket) and the front wheel point to the sky! And it does the same shifting second/third...
I think it is a big no-no for off road use, anyway, as the bike wants to rev up, and the stock setup seems to be more easy to control, IMHO, as it is much more "softer".
You can call it a "show" mode: unplug the EPCs (or close the carburetors hoses... ) and you will be the wheelie king in town...

Per Matteo: ti telefono domani mattina... piu' facile spiegare le cose a voce... eheheh
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