Bypassing Fan and thermostat? - CBR Forum - Enthusiast forums for Honda CBR Owners

Go Back   CBR Forum - Enthusiast forums for Honda CBR Owners > Past CBR Models > CBR 600F3

LinkBack Thread Tools Search this Thread
Old 03-12-2010, 02:53 PM
Junior Member
Join Date: Mar 2010
Location: NJ
Posts: 3
Default Bypassing Fan and thermostat?

How do I bypass the fan and thermostat on a 97 F3 so that it's always cycling and the fan is always on?
It's in a quad and it doesn't get the same amount of wind to cool it as a bike does, so I want to be safe.
Reply With Quote
Old 03-12-2010, 04:48 PM
intiractive's Avatar
Senior Member
Join Date: May 2009
Location: wilmington nc
Posts: 317
Send a message via AIM to intiractive

i wouldnt bypass the thermostat. if it constantly cycles the water, it has no chance to sit in the radiator and be cooled by the fan. it is constantly getting hotter and hotter and will lead to a snowball effect of basically running away by overheating. (but that is only during summer, in the heat). How ever, you can bypass the fan and be fine. The fan is on the back side of the radiator right? Hell, if it was me, I'd have 2 on there (if you could fit it) to blow air on the motor constantly.
You ain't a real mechanic until you've tasted gasoline... be it on purpose or accident

1989 kawi ex500 - sold
1995 cbr 600 F3 "Grace" - 2 wheels, frame, motor... thas bout it...
Reply With Quote
Old 03-12-2010, 05:09 PM
IDoDirt's Avatar
Super Moderator
Join Date: Aug 2006
Location: South Florida, USA
Posts: 3,118
Send a message via Skype™ to IDoDirt

To bypass the fan on the radiator so it's on all the time you need to bypass the Thermo-Switch. The Thermo-Switch is located on the mid up upper left of the Radiator. There is a single wire on the Thermo-Switch that if you short it directly to frame ground, the fan will run all the time it has power. You can see the Thermo-Switch located right above the radiator mounting bracket.
Click the image to open in full size.

How to Repair the Fuel Pump on Your F3
Rode to Austin, TX April 2013, Inaugural MotoGP Race @ Circuit of the Americas.

Don't forget to fill out your profile so we know where you're from.

"Give a man a fish and he will eat for a day. Teach a man to fish and he will eat for a lifetime."

- Confucius, Circa 551 - 479
Reply With Quote
Old 03-15-2010, 10:39 AM
Junior Member
Join Date: Mar 2010
Location: NJ
Posts: 3

Thanks, well I tried that and the fan still wouldn't kick on and then I tried giving the fan power directly from the battery and that didn't work. I guess it's burned out.

How hard do the radiator lines get, cause I feel the radiator and lines getting hot but it doesn't seem to be cycling (and my temp gauge is busted).
Reply With Quote
Old 03-15-2010, 04:42 PM
Kuroshio's Avatar
Senior Member
Join Date: Jul 2009
Location: West Philly, PA!
Posts: 4,476

Hmmm... No temp gauge means all you can really do is check the thermostat to be sure it's operating properly. Should be a diagnostic routine in the manual. You can download the manual with this link if you need it

Essentially the method of testing a thermostat is to remove it, boil it in water with a thermometer and see if it opens at the proper temp. If it is operational and still doesn't seem like coolant is circulating, you prolly need to flush and bleed the radiator.

Our bikes can go from 0 - Stupid in less than "I wonder if this will be a good idea"
Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Bypassing my coolant reservoir. Joecbr General Tech 7 05-17-2014 08:03 AM
Bypassing the air solenoid Kuroshio General Tech 7 06-24-2011 04:49 PM
Bypassing the Air Vent Solenoid Valve? 95Cbr6 CBR 600F3 4 03-07-2008 10:53 PM
Bypassing the Emission Canister KyleRC CBR 600RR 2 01-23-2008 02:48 AM
Bypassing Bank Angle Sensor Jaybird180 F4i - Main Forum 5 03-02-2007 03:10 PM

03, 600, 600f2, 954rr, bypass, bypassing, cbr, f3, fan, honda, sensor, swap, switch, thermal, thermo, thermostat

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


All times are GMT -5. The time now is 01:50 AM.

Honda and the Honda marquee are registered trademarks of the American Honda Motor Company, Inc. Neither American Honda Motor Company nor its subsidiaries or affiliates shall bear any responsibility for content, comments, or advertising. is not affiliated with American Honda Motor Company in any way. American Honda Motor Company does not sponsor, support, or endorse in any way. Copyright/trademark/sales mark infringements are not intended or implied.