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Old 08-14-2011, 05:41 AM   #6586
erdsh
KTM 640 Adventure
 
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Joined: Mar 2008
Location: GY
Oddometer: 104
KTM 640 Mikuni Fuel Pump

Recently I had problems with the fuel pump.
I ordered another mikuni fuel pump which didnt work well, the CARB was pouring fuel.
I bought a round mikuni fuel pump rebuild kit from ebay, such as these:
http://global.ebay.com/MIKUNI-FUEL-P...661696233/item
http://global.ebay.com/Mikuni-Single...585956656/item
http://global.ebay.com/MIKUNI-FUEL-P...573584763/item

and after a few days the kit was here.
after a half an hour work, the fuel pump was installed with the new kit, and it is working well.

just attached a small image describing the operation of the fuel pump. the diaphragm was dry and lack of any flexibility therefore didn't work. the two valves were OK but I replaced them anyway since it was part of the rebuild kit as well as the seals.

FYI.
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Old 08-14-2011, 06:35 AM   #6587
B-Rod
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Joined: Jul 2007
Location: Alberta
Oddometer: 1,902
Quote:
Originally Posted by erdsh View Post
Recently I had problems with the fuel pump.
I ordered another mikuni fuel pump which didnt work well, the CARB was pouring fuel.
I bought a round mikuni fuel pump rebuild kit from ebay, such as these:
http://global.ebay.com/MIKUNI-FUEL-P...661696233/item
http://global.ebay.com/Mikuni-Single...585956656/item
http://global.ebay.com/MIKUNI-FUEL-P...573584763/item

and after a few days the kit was here.
after a half an hour work, the fuel pump was installed with the new kit, and it is working well.

just attached a small image describing the operation of the fuel pump. the diaphragm was dry and lack of any flexibility therefore didn't work. the two valves were OK but I replaced them anyway since it was part of the rebuild kit as well as the seals.

FYI.
Nice! This should be in the index, but you should link the part #'s rather than eBay auctions, since the auctions will disappear in time, and you won't be able to see the info.
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Old 08-14-2011, 08:23 AM   #6588
gunnerbuck
Island Hopper
 
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Joined: Nov 2005
Location: N.V.I, B.C.
Oddometer: 3,967
The item # for the pump repair kit that will work in the 640 OE Mikuni looks to be:Item Number: 290573581154
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Old 08-14-2011, 10:21 AM   #6589
sobota
n00b
 
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Joined: Jul 2011
Location: Bielsko - Biała, Poland
Oddometer: 4
hello
this one is mine


I'm looking for some neighbour to ride
greetings from Bielsko - Biała, Poland
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Old 08-14-2011, 12:38 PM   #6590
bigboyxl
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Joined: May 2011
Location: Czech republic - Ukraine
Oddometer: 314
Quote:
Originally Posted by sobota View Post
hello
this one is mine


I'm looking for some neighbour to ride
greetings from Bielsko - Biała, Poland
welcome sobota
nice Adv you got there!
I live in Liberec, Czech rep. - not extremely close to you, but I guess closer then others over here
As riding off-road in Czech is banned completely maybe you can recommend some trails near border in Poland?
We could ride out some weekend in locations you know together

Greetings
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KTM LC4 640 Adventure 2006 KTM 530 EXC 2011
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Old 08-14-2011, 02:33 PM   #6591
clintnz
Trans-Global Chook Chaser
 
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Joined: May 2004
Location: Rotoiti, New Zealand
Oddometer: 3,369
Quote:
Originally Posted by gutsiegutsie View Post
Any other suggestions or questions I may be wanting to ask?
Another point to note is that oil leaks from the countershaft are often caused by the o-ring behind the bush that the seal runs on, rather than the seal, it's good practice to replace both. There are several places that oil can leak from around that area & the neutral/EPC sensors would be about the least likely thing to be a problem, especially given both the countershaft seal & the oil lines/ filter cover have been worked on recently.

Telling someone that all the oil has dropped out of their LC4 cos their oil sensor has a problem is about as believeable as informing someone that their 2-stroke isn't running right cos the powerband has snapped.

Cheers
Clint
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Old 08-14-2011, 06:50 PM   #6592
dnrobertson
Big Bike, Slow Rider
 
Joined: Jun 2008
Location: Frankston, Australia
Oddometer: 768
Quote:
Originally Posted by clintnz View Post

Telling someone that all the oil has dropped out of their LC4 cos their oil sensor has a problem is about as believeable as informing someone that their 2-stroke isn't running right cos the powerband has snapped.

Cheers
Clint

Yeah, but at least it's easy to buy a new powerband from any motorbike shop!!
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Old 08-15-2011, 12:41 AM   #6593
sobota
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Joined: Jul 2011
Location: Bielsko - Biała, Poland
Oddometer: 4
Quote:
Originally Posted by bigboyxl View Post
welcome sobota
nice Adv you got there!
I live in Liberec, Czech rep. - not extremely close to you, but I guess closer then others over here
As riding off-road in Czech is banned completely maybe you can recommend some trails near border in Poland?
We could ride out some weekend in locations you know together

Greetings
I travel sometimes to Olomounc we have an work office in this town.
In poland riding on the mountains and forrests is unlegal but I know couple of places where we can go offroad without problems
I have ~50 km to czech-pol borderline
send some ur 640 pics
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Old 08-15-2011, 04:43 AM   #6594
bigboyxl
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Joined: May 2011
Location: Czech republic - Ukraine
Oddometer: 314
Quote:
Originally Posted by sobota View Post
I travel sometimes to Olomounc we have an work office in this town.
In poland riding on the mountains and forrests is unlegal but I know couple of places where we can go offroad without problems
I have ~50 km to czech-pol borderline
send some ur 640 pics
here it is
just before my start of the trip to Ukraine


and during some dirty job


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KTM LC4 640 Adventure 2006 KTM 530 EXC 2011
KTM LC8 1190 Adventure
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Old 08-16-2011, 01:00 AM   #6595
sobota
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Location: Bielsko - Biała, Poland
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it is bmw hp2 ?
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Old 08-16-2011, 02:30 AM   #6596
bigboyxl
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Joined: May 2011
Location: Czech republic - Ukraine
Oddometer: 314
Quote:
Originally Posted by sobota View Post
it is bmw hp2 ?
yup, it belongs to my friend from Wroclaw, we ride off-road from time to time together
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KTM LC4 640 Adventure 2006 KTM 530 EXC 2011
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Nomada panniers, Holan crashbars, Remus silencers etc. Worldwide shipping. Better deals for ADVriders
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Old 08-16-2011, 02:24 PM   #6597
makazica
Studly Adventurer
 
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Joined: May 2008
Location: Zagreb, Croatia
Oddometer: 738
Stronger clutch springs

Guys where's that thread about some rally clutch springs? Can't find it.

I remember that there was some talk about three of these rally spec and three of the ordinary spec are a good combination!

I'll need the part numbers and there were some in the thread also...

Thanks!

M.
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Old 08-16-2011, 02:39 PM   #6598
pcvance
Walk Verplank
 
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Joined: Jul 2010
Location: Sequoia Country
Oddometer: 5,387
FWIW here's the setup on my 2000 640-E small valve head. 19000+ miles
BST-40 bible mods done except spring clipping.
snorkle on,KTM racing air box side vent on
45 idle jet
158.5 main
Moose racing foam filter
new carb to air box boot, mine was cracked too
needle stock position
header and s-pipe stock
KTM supermoto muffler (comp no-sparkie)
16/45 sprockets
idle/mixture screw 3 turns out
The bike was stock when I got it over a year ago with 11000 miles on it, ran on the lean side and got around 50 miles per gallon. The mods made a big difference in performance and ridability and I still get around 48 MPG. The bike runs well from sea level all the way up to the highest point I've been @ 12400', the top of White mountain.
Still lifts the front wheel easily in second gear at 10000' elevation. Fuel range is good, with the 18 liter tank, I can usually go 220+ miles before hitting reserve.
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Old 08-19-2011, 11:50 PM   #6599
DuaneP
Flying Pumpkin
 
Joined: Jul 2011
Location: Colorado
Oddometer: 3
2006 640 Adv.

Purchased this 640 several months ago with 7800 miles. The bike has seen some abuse at the hands of the previous owner(s) since the sub frame was bent (I fixed with 2x4' and some friends holding the bike), scratches on rear fender and front fairing and an Acerbis tank to replace stock tank which was destroyed when bike supposedly fell over in garage... Anyway, aftermarket parts that I know of include

Akrapovic Exhaust (music to my ears!)
Acerbis Tank
Emig Racing Steering Stabilizer
High fender conversion
Single front disk brake
After market skid plate with tool box and water tank
Canister and emissions crap MIA
Came with 16 / 45 sprockets (hated combo, way too low)
Now running 17 / 42, which I like much better (now cars are not blurry in mirrors)

Bike back fires letting off gas and runs rough at low rpm, which I'm assuming is due to stock jetting. Thus, my next upgrade is to jet appropriately for less restricted air box and exhaust. Starting to research best combo. Any suggestions would be helpful. I also have a minor oil leak and the rear shock linkage is loose. As far as I can tell, it's the bearing with grease fitting so I will try replacing to see if that fixes problem.

Love this bike, especially with new gearing. Hoping it gets even better with jetting. Rear tire is already more that half consumed. I live in Colorado and have been riding a mix of highway, dirt roads and trials. Any suggestions on a good dual sport tire would be helpful as well. Seems like the knobby that came with bike is over kill for the dryer type trails I've traveled on so far. My last dirt bike was a 1984 XL350R, which strangely enough was orange. I'm slowly trying to get my wheelie skills back without crashing. It's been 20 years since I sold the XL, so I'm easing into the dirt riding.

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Old 08-20-2011, 12:12 AM   #6600
wrk2surf
on the gas or brakes
 
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Joined: Dec 2007
Location: THE exact center of California/Bass lake/Yosemite
Oddometer: 6,395
Quote:
Originally Posted by makazica View Post
Guys where's that thread about some rally clutch springs? Can't find it.

I remember that there was some talk about three of these rally spec and three of the ordinary spec are a good combination!

I'll need the part numbers and there were some in the thread also...

Thanks!

M.

they are used on all high flow head lc4 bikes from 03 up to 07

part number

58536029044
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