ADVrider

Go Back   ADVrider > Bikes > Thumpers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-06-2006, 02:59 PM   #31
potatoho
Cheese and Rice!
 
potatoho's Avatar
 
Joined: Aug 2004
Location: Sea-level
Oddometer: 4,686
Quote:
Originally Posted by fire_strom
so i dont know waht caused it but i i'll be getting a new needle ASAP.
I'd be surprised if it was anything more than a column of air. The smaller washer probably exacerbated the issue by creating a bit less of a seal on the needle hole. The holes are used to equalize pressure in the slide cavity to match the bore, so as it breathes in and out it likely is finding a path via the needle hole as well.
potatoho is offline   Reply With Quote
Old 10-06-2006, 03:00 PM   #32
Reformed DucFlogger
Inventor Of The Wheel Mk2
 
Reformed DucFlogger's Avatar
 
Joined: Jul 2003
Location: Peoples Republic Of Canuckistan
Oddometer: 1,445
Needle

It could be the slide plastic, but damn it would have to be some tough stuff.
__________________
"...who gives a rat fornication?"
Reformed DucFlogger is offline   Reply With Quote
Old 10-06-2006, 03:43 PM   #33
laramie LC4
crash test dummy!
 
laramie LC4's Avatar
 
Joined: Sep 2004
Location: Tucson, Az
Oddometer: 2,345
Quote:
Originally Posted by meat popsicle
I have not seen a how-to on changing the needle jet. Opportunity knocks.
changing the needle jet is quite simple. its just a matter of stripping the carb down, removing it, then repalcing it. when i pull my carb to clean it, i always pull out the needle jet to ensure that everything is clean.

all you do is, remove the top of carb (needle, washers, slide), then pull the float bowl, remove the float and weight, remove the main jet and spacer, then push down on the inside of the area the MJ just came out of and the needle jet comes out through the intake and into the top of the carb. the only real trick is when you put it back in. there is a "knotch" that only allows it to go in one way. you have to look in and align the slot on the jet with the knotch and bingo, your done.

give me a few minutes and ill go take some pics, i have my carb out and it will only take a few secs to snap some pics if ya need them.

laters,

laramie
__________________
DON'T TRUST CUT 7! HE IS A CROOK! ASK ME HOW I KNOW.

'12 LC8 990R, '02 LC4 640, '05 WR 450f (part-out), '98 XR400R, '76 KE100, '05 525 (Step-Child)
laramie LC4 is offline   Reply With Quote
Old 10-06-2006, 04:35 PM   #34
laramie LC4
crash test dummy!
 
laramie LC4's Avatar
 
Joined: Sep 2004
Location: Tucson, Az
Oddometer: 2,345
Quote:
Originally Posted by meat popsicle
I have not seen a how-to on changing the needle jet. Opportunity knocks.
HERE YA GO.....

-remove top of carb (2 bolts or screws)



-then remove needle, slide, and washers



-remove float bowl (2 bolts)



-remove float bowl and expose inside of carb



-remove float and weight. DONT LOSE THE WEIGHT!!!!



-remove main jet (flat head screwdriver)



-push down on needle jet



-needle jet should come out threw the intake and towards the top of carb. dont lose the O-ring! if you dont see it, look into the carb, its sits at the top where the plastic piece jsut came out of.



-remove needle jet from carb



-remove needle jet from palstic body



-when reinstalling look for "knotch" on the inside of the carb. you have to line this up with the "slot" on the needle jet. (in this pic i exagerated it and marked it with blue so it was easier to see)



-here is the "slot" on the needle jet. sorry for the crappy pic. my camera sucks at close up, detailed pics...



and that is how you change the needle jet. piece of cake.....

laters,

laramie
__________________
DON'T TRUST CUT 7! HE IS A CROOK! ASK ME HOW I KNOW.

'12 LC8 990R, '02 LC4 640, '05 WR 450f (part-out), '98 XR400R, '76 KE100, '05 525 (Step-Child)
laramie LC4 is offline   Reply With Quote
Old 10-06-2006, 08:19 PM   #35
fire_strom OP
Beastly Adventurer
 
fire_strom's Avatar
 
Joined: Sep 2004
Location: Durango, CO
Oddometer: 1,257
you rock, nice work.
scott
__________________
Officially motor free
9 cycles with pedals

fire_strom is offline   Reply With Quote
Old 10-06-2006, 08:43 PM   #36
meat popsicle
Ignostic
 
meat popsicle's Avatar
 
Joined: Feb 2004
Location: Circumlocution Office of Little Dorrit
Oddometer: 14,159
Thank you Laramie.

Will you be giving this a try fire_strom?
__________________
Kronreif Trunkenpolz Mattighofen LC4 640

Its not so much staying alive; its staying human that counts.
meat popsicle is offline   Reply With Quote
Old 10-07-2006, 07:35 AM   #37
horse
n00b
 
Joined: Jan 2006
Oddometer: 6
Needle Wear

My needle actually snapped out in the bush and i had to ride back at a constant throttle opening on the choke circuit anyway after a bit of investigation the slide has a step right near the needle hole and the needle wears because the steel washer sits at about a 30 degree angle cocking the needle to the side and constantly stressing against the steel washer when the spring pressure is put on it and the needle is forced into the jet, any carb that i have had apart the needle is parrallel to the slide and free to centralise in the needle jet,if you assemble the bst 40 slide it wants to push the needle one way so i fabricated a little nylon washer so the step is negated, the needle now is central and so far, about a year and quite a few hard dirt miles everything is ok it might not be right but it seems to work and i think the carb is a little more responsive as the friction of the needle to jet is gone (maybe in my head).If this doesnt make sense pull the slide out and look down inside then put some spring pressure on the assembled needle and slide and you will soon work it out,
Hope this helps,
Horse.
horse is offline   Reply With Quote
Old 10-07-2006, 02:51 PM   #38
Reformed DucFlogger
Inventor Of The Wheel Mk2
 
Reformed DucFlogger's Avatar
 
Joined: Jul 2003
Location: Peoples Republic Of Canuckistan
Oddometer: 1,445
Horse...

...great input!

Next time I have the slide out I'll see about replacing that washer with a plastic or HMM.. (High Molecular somesuch plastic I have laying around - really low friction stuff used in woodworking for jigs, the name of which escapes me).
__________________
"...who gives a rat fornication?"
Reformed DucFlogger is offline   Reply With Quote
Old 10-08-2006, 08:01 AM   #39
fire_strom OP
Beastly Adventurer
 
fire_strom's Avatar
 
Joined: Sep 2004
Location: Durango, CO
Oddometer: 1,257
Quote:
Originally Posted by meat popsicle
Thank you Laramie.

Will you be giving this a try fire_strom?
Ive got an order in for a needle, should be here Wednesday and Im going to the desert Thursday morning for the weekend so for now, no. I have a rag stuffed in the carb and haven't taken it out to look at the needle jet. I will probably swap it out over the winter, maybe the slide and slide guide too.
scott
__________________
Officially motor free
9 cycles with pedals

fire_strom is offline   Reply With Quote
Old 01-25-2008, 12:25 AM   #40
positionsize
Gnarly Adventurer
 
positionsize's Avatar
 
Joined: Jan 2007
Location: Arizona, Florida and Philippines
Oddometer: 103
Quote:
Originally Posted by laramie LC4
HERE YA GO.....

-remove top of carb (2 bolts or screws)



-then remove needle, slide, and washers



-remove float bowl (2 bolts)



-remove float bowl and expose inside of carb



-remove float and weight. DONT LOSE THE WEIGHT!!!!



-remove main jet (flat head screwdriver)



-push down on needle jet



-needle jet should come out threw the intake and towards the top of carb. dont lose the O-ring! if you dont see it, look into the carb, its sits at the top where the plastic piece jsut came out of.



-remove needle jet from carb



-remove needle jet from palstic body



-when reinstalling look for "knotch" on the inside of the carb. you have to line this up with the "slot" on the needle jet. (in this pic i exagerated it and marked it with blue so it was easier to see)



-here is the "slot" on the needle jet. sorry for the crappy pic. my camera sucks at close up, detailed pics...



and that is how you change the needle jet. piece of cake.....

laters,

laramie

Great post Laramie! But for some reason none of the pics in this post will load . The thread is posted the Index so perhaps it is worthy of fixing?

positionsize screwed with this post 01-25-2008 at 12:41 AM
positionsize is offline   Reply With Quote
Old 01-25-2008, 07:33 AM   #41
meat popsicle
Ignostic
 
meat popsicle's Avatar
 
Joined: Feb 2004
Location: Circumlocution Office of Little Dorrit
Oddometer: 14,159
Quote:
Originally Posted by positionsize
Great post Laramie! But for some reason none of the pics in this post will load . The thread is posted the Index so perhaps it is worthy of fixing?
He's around again and fixed some other pic links. PM him if he doesn't show up in a bit. If that don't work, check KTMTalk; much of his stuff is over there too.
__________________
Kronreif Trunkenpolz Mattighofen LC4 640

Its not so much staying alive; its staying human that counts.
meat popsicle is offline   Reply With Quote
Old 04-12-2008, 01:45 PM   #42
mdogruc
Mesut DOGRUC-Adana/TURKEY
 
mdogruc's Avatar
 
Joined: Nov 2006
Location: ADANA / TURKEY / Northeast edge of Mediterranean
Oddometer: 8
One more needle from an all stock 2004 LC4 640 Adv at 32.000kms

__________________
There is no perfect bike, I need a transformer
mdogruc is offline   Reply With Quote
Old 04-14-2008, 08:57 AM   #43
tallbob
Studly Adventurer
 
tallbob's Avatar
 
Joined: May 2005
Location: Butt Mt. VA
Oddometer: 579
Yeah, me too. I believe it's normal wear. When I got my 99 640E it had 13,000 miles. I checked the carb and raised the needle one slot at the clip and noticed no wear. Now at 22,000 miles mine looks like these pictures. Thanks for reminding me I need to order a new one, unless I get around to installing the FCR. This wear doesn't seem to affect the way the bike runs.
tallbob is offline   Reply With Quote
Old 04-14-2008, 09:40 AM   #44
boyscout
sittin' down
 
boyscout's Avatar
 
Joined: Oct 2001
Location: Cascadia
Oddometer: 1,322
Quote:
Originally Posted by tallbob
This wear doesn't seem to affect the way the bike runs.
Just wait till you get in an offroad situation where you need to run for periods at near full throttle. The needle will vibrate to the point that the engine floods. Not great when the engine floods and dies in the middle of that steep scrabbly section that you really needed to clean.
__________________
Who me?

boyscout is offline   Reply With Quote
Old 07-26-2010, 02:23 PM   #45
Jan from Finland
Registered
 
Joined: May 2005
Oddometer: 558
Quote:
Originally Posted by fire_strom
I have the needle out of the carb and there is a large notch out of it. any idea what might have caused this?

Quote:
Originally Posted by Jan from Finland
My needle broke two months ago at about 70 000 km for the same reason.
Argh! Now I got just 25000 km out of it. Check that needle before you wander far away! I was at Arctic Circle.
__________________
-----------------------------------------------------------------------------------------
If you are ever attacked by lion, your best defense is to shove your arm down
their throat, grabbing the back of their tongue and hope help arrives quickly.
- Pro Travel Tip by Overland Journal
-----------------------------------------------------------------------------------------
Jan from Finland is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 05:31 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014