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Mar 28th 2016, 08:58 PM   #1
 Pigs's Avatar
 
  Jan 2016
  Portland

  bicicleta
Engine Overheating Problems

Hi everyone. Since I have replaced the radiator(did several other things while I had my bike apart) and now my bike overheats in traffic. Not my first time having the radiator off/doing a coolant flush on this bike.
Things to note:
  • Cools right down when going highway speeds
  • steadily climbs in temp in stop & go traffic
  • going ~25mph seems to run a little hot at 200F(not sure if normal, never paid attention to temp gauge that often)
I left my bike on to get up to temp to try to see why it was overheating and noticed fan wasn't spinning fast at all, and other times I checked when my bike was sitting at a toasty temp of 235F, fan wasn't spinning at all. Its normally loud enough to hear when riding. Checked fuses for the fan. Going to try to make sure the fan is getting enough voltage and current and also heard of hooking the radiator fan to the blinkers which ill try tomorrow. Also every once and a while I will get a whiff of burning coolant coming up from below. Not sure if its residual coolant from when I spilt a little when filling or if there is a leak somewhere(I checked pretty hard and found nothing). Made a mark on the reservoir to see if I am actually loosing any coolant.

Going to take my bike apart again tomorrow to fix a valve cover leak. If my fan isn't operating, I will know whats causing the majority of the problem. But the smell of the occasional coolant and the higher than(what I believe to be) normal temps going at a steady 30mph.

Ideas what to check?
Mar 28th 2016, 09:11 PM   #2
 SilvieFox's Avatar
 
  Jan 2016
  welches, Oregon

  08Kawasaki Versys(Sylvester),72Suzuki RV90(vanvan),81Honda TwinStar(Bobber),Yamaha225,Honda Shadow
test voltage going to fan tho sounds like its time to replace it, i had to replace the one on my versys when i got it , was jammed up and only turned a few times then froze and blew a fuse
Mar 28th 2016, 09:20 PM   #3
 Arcane's Avatar
 
  Jan 2016
  Allyn WA

  ER-6n
If you have replaced your radiator, you may have an air pocket in the system. If that air pocket leaves the temp switch for the fan dry, your fan may not come on. That or the air pocket would be enough to make it overheat.
I would try jumping power to the fan, just to make sure it isn't dead. I would also double check and make sure the cooling system is full, and bled of air.
My bike was running hot and losing coolant. Turns out there was some crud in my radiator, and it had gotten under the edge of the seal for the radiator cap. Any time it built up any pressure, it would barf out coolant.
Mar 28th 2016, 09:47 PM   #4
 TimberMoto's Avatar
 
  Jan 2016
  Salem, Oregon

  Supermoto Dreaming...
I installed a switch and wired it to my fan. That way I can reach down and turn it on when the bike is running hot. Not saying it's the best solution, but it works great.

Sent via HTC One_M8
Mar 29th 2016, 08:37 AM   #5
 mgfchapin's Avatar
 
  Jan 2016
  Kirkland, WA

  Daytona 675R
Quote:
Originally Posted by Arcane
If you have replaced your radiator, you may have an air pocket in the system. If that air pocket leaves the temp switch for the fan dry, your fan may not come on. That or the air pocket would be enough to make it overheat.
This is my best guess too and the easiest possible problem to fix.
Mar 29th 2016, 08:39 AM   #6
DGA
 DGA's Avatar
Moderator
 
  Jan 2016
  PDX

  An Ape and a Husky
Test the fans with a direct 12V to them. If they seem fine, burp the system.
Apr 3rd 2016, 02:17 PM   #7
 Pigs's Avatar
 
  Jan 2016
  Portland

  bicicleta
Found the problem. The overflow hose was sitting on top of the fan which caused the fan to not spin as fast as it should(and destroyed the overflow hose). There was also a pin hole in another small hose which caused the smell. Thanks for all the replies.

EDIT: Just took it for a ride and it didn't seem to help at all. At 235F, the fan usually kicks on at ~218F, but the fan wasn't on. Will try some other solutions mentioned when I have time again.

Edited by Pigs on Apr 3rd 2016 at 03:46 PM
Apr 3rd 2016, 04:08 PM   #8
 SilvieFox's Avatar
 
  Jan 2016
  welches, Oregon

  08Kawasaki Versys(Sylvester),72Suzuki RV90(vanvan),81Honda TwinStar(Bobber),Yamaha225,Honda Shadow
Quote:
Originally Posted by Pigs
Found the problem. The overflow hose was sitting on top of the fan which caused the fan to not spin as fast as it should(and destroyed the overflow hose). There was also a pin hole in another small hose which caused the smell. Thanks for all the replies.

EDIT: Just took it for a ride and it didn't seem to help at all. At 235F, the fan usually kicks on at ~218F, but the fan wasn't on. Will try some other solutions mentioned when I have time again.
fan or fuse could have burnt up from not being able to spin freely
Apr 3rd 2016, 05:53 PM   #9
 MarvTravis's Avatar
 
  Jan 2016
  Kirkland, WA

  Kawasaki ZX-14
When you replaced your radiator, is there a possibility you interchanged two finger-sized coolant lines at the top of the radiator? I had a shop inadvertently swap the two lines (which are the same diameter) on my Blackbird. The fittings at the top of the radiator are only about an inch apart. One line runs from the water pump to the radiator to provide coolant flow until the thermostat opens; the other line runs from the radiator to the overflow reservoir. At the radiator, one fitting is between the two seals of the radiator cap; the other fitting is below the lower seal of the radiator cap.

The consequence of the two lines being interchanged was that coolant was being pumped directly from the radiator into the overflow reservoir, and the reservoir was overfilling and dumping coolant overboard. The tip-off was the 2" coolant hose that should have been pressurized when the engine was up to temperature, was flaccid. Returned the two finger-sized hoses to the correct fittings at the radiator, replaced a faulty radiator cap, (which was the actual original culprit), and the overheating problem was resolved.
Apr 3rd 2016, 08:14 PM   #10
 Pigs's Avatar
 
  Jan 2016
  Portland

  bicicleta
Quote:
Originally Posted by MarvTravis
When you replaced your radiator, is there a possibility you interchanged two finger-sized coolant lines at the top of the radiator? I had a shop inadvertently swap the two lines (which are the same diameter) on my Blackbird. The fittings at the top of the radiator are only about an inch apart. One line runs from the water pump to the radiator to provide coolant flow until the thermostat opens; the other line runs from the radiator to the overflow reservoir. At the radiator, one fitting is between the two seals of the radiator cap; the other fitting is below the lower seal of the radiator cap.

The consequence of the two lines being interchanged was that coolant was being pumped directly from the radiator into the overflow reservoir, and the reservoir was overfilling and dumping coolant overboard. The tip-off was the 2" coolant hose that should have been pressurized when the engine was up to temperature, was flaccid. Returned the two finger-sized hoses to the correct fittings at the radiator, replaced a faulty radiator cap, (which was the actual original culprit), and the overheating problem was resolved.
Checked with the exploded diagram. Upper nipple goes to overflow reservoir and the lower nipple goes to the engine. Good thinking though.

Also, what is this fan switch or temp switch that is being mentioned in previous posts? Couldn't find any mention with a search in my service manual. Only thing I can think of is the thermostat. I bled the coolant and got a good chunk of the air bubbles out after I changed the small coolant lines so I can't imagine there would be a big enough air bubble to cause the thermostat not to switch.
Apr 3rd 2016, 08:49 PM   #11
 
  Jan 2016
  Spokane, WA

  1299 Panigale Anniversario #81/500, 2006 GSX-R 1000
Quote:
Originally Posted by Pigs
Checked with the exploded diagram. Upper nipple goes to overflow reservoir and the lower nipple goes to the engine. Good thinking though.

Also, what is this fan switch or temp switch that is being mentioned in previous posts? Couldn't find any mention with a search in my service manual. Only thing I can think of is the thermostat. I bled the coolant and got a good chunk of the air bubbles out after I changed the small coolant lines so I can't imagine there would be a big enough air bubble to cause the thermostat not to switch.
There can't be ANY air in the system or it will over heat. Pretend like you're bleeding the brakes. Any air is too much.
Apr 19th 2016, 07:10 AM   #12
 curve addict's Avatar
 
  Apr 2016
  Des Moines, WA

  ...1987 Yamaha FZR1000...
Quote:
Originally Posted by Pigs
Checked with the exploded diagram. Upper nipple goes to overflow reservoir and the lower nipple goes to the engine. Good thinking though.

Also, what is this fan switch or temp switch that is being mentioned in previous posts? Couldn't find any mention with a search in my service manual. Only thing I can think of is the thermostat. I bled the coolant and got a good chunk of the air bubbles out after I changed the small coolant lines so I can't imagine there would be a big enough air bubble to cause the thermostat not to switch.
Year, make and model of bike?
Apr 19th 2016, 07:42 AM   #13
 
  Jan 2016
  Washington

200F? That's it?

The fan on my bike doesn't even kick on until 220F. It stays on until it drops to 210.

25 MPH doesn't provide a lot of air over the radiator. Mine runs hot too (190+) until I hit 45-50, then it drops to the normal 180-185, where the thermostat opens. Even with engine ice.....

Odds are things are just fine.
Apr 19th 2016, 07:55 AM   #14
DGA
 DGA's Avatar
Moderator
 
  Jan 2016
  PDX

  An Ape and a Husky
Quote:
Originally Posted by Redkat600
200F? That's it?

The fan on my bike doesn't even kick on until 220F. It stays on until it drops to 210.

25 MPH doesn't provide a lot of air over the radiator. Mine runs hot too (190+) until I hit 45-50, then it drops to the normal 180-185, where the thermostat opens. Even with engine ice.....

Odds are things are just fine.
There seems to be something amiss.

Quote:
Originally Posted by pigs
Just took it for a ride and it didn't seem to help at all. At 235F, the fan usually kicks on at ~218F, but the fan wasn't on. Will try some other solutions mentioned when I have time again.
Apr 19th 2016, 08:01 AM   #15
 
  Jan 2016
  Washington

Quote:
Originally Posted by DGA
There seems to be something amiss.
Oopsie.

I missed that.

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