89 KLR650 slow temp rise uphill - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

 1Likes
  • 1 Post By kiwi1945
 
LinkBack Thread Tools Display Modes
post #1 of 10 Old 02-26-2020, 01:15 PM Thread Starter
Neutral
 
Join Date: Feb 2020
Posts: 5
89 KLR650 slow temp rise uphill

I bought a 89 KLR 650 with 963 miles on the odometer a couple of months ago, the bike fires right up and runs well but I noticed the temp slowly rising on up hill highway speed stretches in the first few days of owning it, but otherwise it ran great. I changed the oil (rotella t 15w 40), cleaned the air filter, checked the valves (in spec), did a compression test (100 psi), flushed the cooling system which had some rust in it assuming this was the problem I bought a radiator flush by Prestone ran this through then flushed again with distilled water which came out looking pretty clean I put engine ice in burped the system and continued my service. I replaced the t stat and I also installed a manual fan switch at this time. When I test rode it I headed for the nearest bit of slightly uphill freeway it ran perfectly all the way there (10 miles of twisty hwy) in fact more on the cool side but as soon as I hit freeway speeds it began to slowly head for the red I could only make it a couple miles before getting almost to the red but when I pull off and slow down the temp slowly decreases. I ride home downhill on the freeway and back down the highway without any issue. I try replacing the radiator (I have another klr 650 that acts a parts bike from time to time) I refill the coolant burp the system double check for circulation, seems fine but it drops a little I top it off and test ride it. Same thing. I come home and start looking for air leaks fix a tiny crack in the air box and cracked nipple and install an oversized main jet. This makes it where I can go about 15 miles on that uphill freeway stretch before it goes to about 3/4 of the way up, whether the fan is on or off. There’s no coolant or oil loss to speak of. It rides perfectly except in this one condition and I’m at a loss for what to try next. Any ideas would be appreciated.
89klr650 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old 02-26-2020, 03:15 PM
1st Gear
 
Join Date: Jun 2017
Location: Granger, Indiana
Posts: 64
You haven't said if it actually overheats ..... I bet not ... Uphill, more work, more drag, more heat ...

What is the OAT at the time this is happening ?
MrZappo is offline  
post #3 of 10 Old 02-26-2020, 04:17 PM Thread Starter
Neutral
 
Join Date: Feb 2020
Posts: 5
Air temp has been 40-60 F actually even did it once while raining. The temp gauge is slowly climbing up and will almost hit the red after only 15 miles or so on the freeway with my other klr this was never an issue and it definitely seems like strange behavior to me but maybe it’s more common I was under the impression that 3/4 of the way up and climbing slowly was pretty much overheating.
89klr650 is offline  
 
post #4 of 10 Old 02-26-2020, 05:42 PM
Neutral
 
Join Date: Sep 2019
Location: South Australia
Posts: 14
Definitely weird behavior. My KLR never gets hot at high speeds. Even in much higher air temps than you mention.

My initial thought is a lean mixture making the bike running hotter than normal. Or maybe this combined with some sort of blockage in the coolant system somewhere.

If the uphill section is particularly steep then something on the bike might be moving back as the bike heads uphill and this is causing some sort of problem? Maybe crimping a hose somewhere or moving something that is loose. There isn't a cover or flap of some sort that can blow across the radiator?

But my next move would be to get the cooling system pressure flushed. It sounds like it works OK until it gets just a little too much heat then struggles.
89a3 is offline  
post #5 of 10 Old 02-26-2020, 06:23 PM Thread Starter
Neutral
 
Join Date: Feb 2020
Posts: 5
I was concerned about a lean mixture as well, but i have searched for something causing it, and havenít been able to find anything. I went with a 160 main jet and repaired a tiny crack in the air box and this seems to have helped, but it has only prolonged the inevitable slow rise of the temp gauge. The hill is not particularly steep but it is almost always a 65mph freeway when i run into the issue. There is nothing obstructing the radiator It runs perfectly around town down back roads and twistys but like you say anything that requires prolonged high revs and heat and it will slowly heat up. I may have to have the cooling system pressure flushed like you say it might be a good option and I appreciate the responses.
89klr650 is offline  
post #6 of 10 Old 02-26-2020, 06:29 PM Thread Starter
Neutral
 
Join Date: Feb 2020
Posts: 5
Just to add a quick thing I read that the system should be burped at multiple rev ranges and i normally let it idle to burp it so i tried this today and noticed that i still got some small bubbles out and also that once the tstat opened any time i gave it throttle coolant would blow out. I topped it back off and will go do a test ride now but i was just curious if anyone knew if that was normal? Donít think Iíve ever revved it with the cap off.
Thanks
89klr650 is offline  
post #7 of 10 Old 02-27-2020, 06:03 PM
1st Gear
 
Fanbelt's Avatar
 
Join Date: Nov 2014
Location: Midland TX
Posts: 83
Just something to try, remove the front fender and go for a ride. See if anything changes.

I have actually seen Dave Brubeck perform live , Take Five
Fanbelt is offline  
post #8 of 10 Old 02-27-2020, 07:13 PM
OverDrive
 
Join Date: Nov 2009
Location: Lander, Wyoming
Posts: 6,204
Quote:
Originally Posted by 89klr650 View Post
Air temp has been 40-60 F actually even did it once while raining. The temp gauge is slowly climbing up and will almost hit the red after only 15 miles or so on the freeway with my other klr this was never an issue and it definitely seems like strange behavior to me but maybe itís more common I was under the impression that 3/4 of the way up and climbing slowly was pretty much overheating.
First I will ask if the 'Engine Ice' coolant you used also is Anti-Freeze rated????? There is a major protection difference on the LOW End.

I think that your bike has a loose nut on the water pump impeller. Purchase a new gasket and be Extremely careful, 87 INCH POUNDS Only!
Too many people strip the threads on the shaft, then you gotta' take both sides of the engine off to change the Balancer shaft/coolant shaft.

Member "Jts45acp" a friend of mine in FL is currently dealing with a stripped coolant shaft on a $500, 2011 KLR650.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
pdwestman is offline  
post #9 of 10 Old 02-28-2020, 08:13 PM Thread Starter
Neutral
 
Join Date: Feb 2020
Posts: 5
I will test ride the bike again tomorrow with the fender off and have a chance to work on it as well so if that doesnít help I will see if the dealer has a gasket or if not get one ordered and check for the loose bolt on the impeller
Thanks for the replies
89klr650 is offline  
post #10 of 10 Old 03-05-2020, 09:00 AM
Neutral
 
Join Date: Jan 2013
Location: NewZealand born living in Queensland Australia
Posts: 10
Have you thought of testing the thermostat and ascertain whether it is opening fully under load.
MrZappo likes this.
kiwi1945 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki KLR 650 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome