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 05-12-2006, 09:45 PM   #1
fire_strom OP
Beastly Adventurer
 
fire_strom's Avatar
 
Joined: Sep 2004
Location: Durango, CO
Oddometer: 1,256
LC4 running Hot

I have looked in the threads but not found what i was looking for.
the 99 LC4e runs hot when running second gear (some first gear) off road. the fan will kick on and stay on long when other bikes don't. sometimes the light will come on. i will reassess jetting, considering a bigger main. the bike runs great though. haven't checked the plug but i am not sure what exactly i'd be looking for. i have checked the coolant level, and wha-la, it is a bit low. i can see the fins when the coolant is cool. so with the bike running i fill it to 10mm over fins as told in the OM. i do it while it is running like it says to. well when it heats up to operating temp the thing overflows. so i suck out the fluid till i can get the cap on and ride. later when i check it cool again it is back to where it was. i never see puddles, the oil nor coolant is the headgasket milkshake that i have seen on cars with water oil mixing. i have heard references to bleeding the system but never seen a how to. could this be the issue? could the rad cap be bad and letting coolant out in a way i am not catching. can just about a cup of coolant low make the difference.
come wise ones (and bring the peanut galley) and shed light
scott
__________________
Officially motor free
9 cycles with pedals

fire_strom is offline   Reply With Quote
Old 05-12-2006, 10:39 PM   #2
creeper
Still alive...
 
creeper's Avatar
 
Joined: Dec 2003
Location: Puget Sound
Oddometer: 10,718
Just to toss out a few things...

How many miles on the bike?
How old is the coolant?
What kind of coolant? Premix or DIY?
What have you changed/done to the engine/carburetion in the last few months... anything?
Exhaust condition... muffler clogged up? Needs fresh packing?
Air filter clean?
Looked at the carb vacuum diaphragm lately?
Checked the float bowl for sedement, main jet and emulsion tube for contamination?
Float level correct?
First and second gear... how fast, how many rpm?
Condition of radiators... dents, folded fins?
Condition of hoses... any appear "soft", pinched or collapsing?
Condition of radiator cap and rating?
Ever have the pump off?

The only "burp" I am aware of is to lean the bike waaaay over to the left and hold it for a bit.

C
__________________
So... how's tricks?
creeper is offline   Reply With Quote
Old 05-13-2006, 12:53 AM   #3
Buckster
Banned
 
Buckster's Avatar
 
Joined: Jul 2004
Location: Atlanta GA or London UK
Oddometer: 1,003
What Creeper said plus what grade oil are you using? Is it the right viscosity for the temperature you are riding in and is it a good grade synthetic?
Buckster is offline   Reply With Quote
Old 05-13-2006, 07:03 AM   #4
fire_strom OP
Beastly Adventurer
 
fire_strom's Avatar
 
Joined: Sep 2004
Location: Durango, CO
Oddometer: 1,256
Quote:
Originally Posted by creeper
Just to toss out a few things...

How many miles on the bike?
How old is the coolant?
What kind of coolant? Premix or DIY?
What have you changed/done to the engine/carburetion in the last few months... anything?
Exhaust condition... muffler clogged up? Needs fresh packing?
Air filter clean?
Looked at the carb vacuum diaphragm lately?
Checked the float bowl for sedement, main jet and emulsion tube for contamination?
Float level correct?
First and second gear... how fast, how many rpm?
Condition of radiators... dents, folded fins?
Condition of hoses... any appear "soft", pinched or collapsing?
Condition of radiator cap and rating?
Ever have the pump off?

The only "burp" I am aware of is to lean the bike waaaay over to the left and hold it for a bit.

C
21000
1200
not sure
no changes
muffler is sxc type. sounds same
yes
6 or 7000 ago
none of that, 150main
think, sethro had the carb well set up but i haven't checked float
about 5-25mph (ya ride faster (twas single/ATV track and tech moab stuff)
they look good, clean
they felt firm, appear clear
cap is original i think. it says 14 on it i think.
never

15-50 right now, always motul 5100 (semi) since i've had it.

ambient temps were between about 65 and 80 the times i've noticed this.

i guess changing the coolent is a good place to start. what are you all flushing w/?
scott
__________________
Officially motor free
9 cycles with pedals

fire_strom is offline   Reply With Quote
Old 05-13-2006, 09:24 AM   #5
creeper
Still alive...
 
creeper's Avatar
 
Joined: Dec 2003
Location: Puget Sound
Oddometer: 10,718
Quote:
Originally Posted by fire_strom
21000
1200
not sure
no changes
muffler is sxc type. sounds same
yes
6 or 7000 ago
none of that, 150main
think, sethro had the carb well set up but i haven't checked float
about 5-25mph (ya ride faster (twas single/ATV track and tech moab stuff)
they look good, clean
they felt firm, appear clear
cap is original i think. it says 14 on it i think.
never

15-50 right now, always motul 5100 (semi) since i've had it.

ambient temps were between about 65 and 80 the times i've noticed this.

i guess changing the coolent is a good place to start. what are you all flushing w/?
scott

Yeah, the coolant might be a good place to start even though it's not that old... only because you don't know what the type or concentration is.

I really don't see anything in the Q&A that indicates a problem. You could look at a few of the things mentioned that haven't had an eyeball on them in awhile... but I doubt you'll find anything serious.

I just use purified water, but there are coolant system flushes available at auto parts stores that will remove scale and schmutz from the cooling system if you think that might be a concern.

Best 'O luck,
C
__________________
So... how's tricks?
creeper is offline   Reply With Quote
Old 05-13-2006, 10:04 AM   #6
markjenn
Beastly Adventurer
 
Joined: Nov 2003
Location: Swellvue, WA
Oddometer: 10,308
I'm not a believer that things like jetting and coolant additives will have a huge impact. Mostly it's just having the cooling system up to snuff: good 50-50 mix of quality coolant, properly bleed system, good thermostat, fan coming on properly, etc.

It's possible you're just asking too much of the stock system. In very hot weather, my 2000 in stock trim, even with the fan on continously, would sometimes show the overheat light in very slow going. But even a walking pace would cool it enough for the light to go out.

Sometime in the 2000/2001 MY area, KTM revised the cooling fan and shroud so that the fan pulled air through a much larger area of the radiator. Many of us with the early bikes have changed over to the new setup and a few of us have even gone ahead and fitted the new setup to the left side and put the old fan on the right to have dual fans.

The bleeding is nothing fancy - just fill the bike when cold and let it run with the cap off, keeping it full, and perhaps rocking the bike from side to side. When it gets pretty hot, shut if off, let it cool, top it off, and replace the cap. I don't bother with trying to estimate how much coolant is above the fins - I just fill it to the top.

After good coolant, I'd next replace the pressure cap followed by the thermostat.

I'm not a believer that jetting has that much effect on overall heat load on the engine, especially at slow speeds. Does it really make much sense that changing the main jet is going to prevent overheating while idling and in 1st gear?

- Mark
markjenn is offline   Reply With Quote
Old 05-13-2006, 10:41 AM   #7
meat popsicle
Ignostic
 
meat popsicle's Avatar
 
Joined: Feb 2004
Location: Circumlocution Office of Little Dorrit
Oddometer: 14,147
If you are in need of a bit more cooling, then perhaps a larger shroud as markjenn indicated would help. I happen to have a larger shroud that I do not need (going with the smaller EXC shroud ala-wageslave for the second) - PM me if you want it.

This next bit is very preliminary, but it might help as well. I am currently trying to translate some of the Sommer KTM 640a catalog because it seems there are quite a few tips in it. It is only in German, but I had an online translator () process it. Here is a tip that might help on cooling:

Quote:
Originally Posted by Sommer KTM 640a catalog
Keep Cool Adventure
Um di e Kühl l uf t i n di e r i cht i gen Bahnen
z u l enk en,we r den s ei t l i c h r e c h t s und
l i nks am Kühl er Foam St ri ps auf gek l ebt.
Di e Schaumst rei f en verhi ndern,dass di e
Kühl l uf t z wi schen Tank und Kühl er unge-
nut z t vorbei fegt.Nach der Mont age der
St r ei f en wi r d di e Kühl l uf t z wangswei se
auf di e Kühl er gel enk t.Ei ne ei nf ache und
wirkungsvolle Maßnahme.
2 x (3431)je € 2,20
Quote:
Originally Posted by Babelfish translation
Keep Cool Adventure
Around the cooling air into the correct courses
to steer, become laterally right and
left at the radiator Foam Strips glued on.
The foam strips prevent that those
Cooling air between tank and radiator unge
uses past sweeps. After the assembly that
Strip becomes the cooling air obligatorily
on the radiators guided. A simple and
effective measure.
I think it's saying that sticking some cheapo foam strips between the radiator and the tank will help direct more air thru the radiator (instead of around it). On second thought, not sure if that helps with the LC4e... anyways, plenty of good stuff from the guys. And let me know if you want the big fan shroud.
__________________
Kronreif Trunkenpolz Mattighofen LC4 640

Its not so much staying alive; its staying human that counts.
meat popsicle is offline   Reply With Quote
Old 05-13-2006, 11:37 AM   #8
fire_strom OP
Beastly Adventurer
 
fire_strom's Avatar
 
Joined: Sep 2004
Location: Durango, CO
Oddometer: 1,256
i've been figuring on a 2nd fan but wanted to make sure there wasn't anything broken or out of repair before i added the fan. i'll replace the coolant too just to be sure. is there a way to check the cap. isn't there a napa replacement one, or is that the thermostat?
scott
__________________
Officially motor free
9 cycles with pedals

fire_strom 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 04:02 AM.


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