Voltage drop @220 degrees f4i HELP! - Honda Motorcycles - FireBlades.org
Honda CBR 600 Discussion of the Honda CBR 600F1, Honda CBR 600F2, Honda CBR 600F3, Honda CBR 600F4, Honda CBR 600F4i, and Honda CBR 600RR Motorcycles.

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post #1 of 23 Old 08-01-2017, 7:56 PM Thread Starter
 
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Voltage drop @220 degrees f4i HELP!

Alright guys,

2006 cbr600 f4i, 25,500 miles
This is my first bike and I bought it used. It ran great without any problems for the first 200ish miles. (back and forth from work. Over 15 days or so)

What is happening is, I'll start the bike and let it warm up. The temperature gauge will claim all the way up to 230 over the course of 7 or so minutes, only ideling. 80-90 degree day.

0-219 degrees the voltage is @ 13.9-14.2 --RPM 1.5k
220 and up the voltage immediately drops to 12.6 and continues to decline. And the RPMS drop to 800-1000
If I turn the bike off, I can not start it back up. It acts as if the battery is dead / dying. If I replace the battery with a new battery while the bike is still hot the new battery acts as if it's dead. Once it cools back off. It starts without a problem.

The fan never kicks on.
The fan not coming on is going to be the next thing I look into.

Things I've replaced.
Starter
R/R
starter relay
stator.


At what point should the fan be kicking on?
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post #2 of 23 Old 08-02-2017, 2:43 AM
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Re: Voltage drop @220 degrees f4i HELP!

Quote:
Originally Posted by MrEwubbsZ View Post
Alright guys,

2006 cbr600 f4i, 25,500 miles
This is my first bike and I bought it used. It ran great without any problems for the first 200ish miles. (back and forth from work. Over 15 days or so)

What is happening is, I'll start the bike and let it warm up. The temperature gauge will claim all the way up to 230 over the course of 7 or so minutes, only ideling. 80-90 degree day.

0-219 degrees the voltage is @ 13.9-14.2 --RPM 1.5k
220 and up the voltage immediately drops to 12.6 and continues to decline. And the RPMS drop to 800-1000
If I turn the bike off, I can not start it back up. It acts as if the battery is dead / dying. If I replace the battery with a new battery while the bike is still hot the new battery acts as if it's dead. Once it cools back off. It starts without a problem.

The fan never kicks on.
The fan not coming on is going to be the next thing I look into.

Things I've replaced.
Starter
R/R
starter relay
stator.


At what point should the fan be kicking on?
Hi at 219, that's when the fan should kick in, maybe the loss of voltage is because of that , the fan draws a lot of voltage when running , check the 10amp fuse and connections at the fan switch could be a broken wire
P.S. have you checked with a separate source that the fan works

Last edited by MrPickwick; 08-02-2017 at 3:23 AM.
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post #3 of 23 Old 08-02-2017, 3:14 PM
 
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Re: Voltage drop @220 degrees f4i HELP!

The solution to your problem:......drumroll please....

The idle is too low. It should be around 1200. The charging system is discharging the battery below that.
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post #4 of 23 Old 08-03-2017, 4:48 PM Thread Starter
 
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Re: Voltage drop @220 degrees f4i HELP!

Quote:
Originally Posted by spagiratwink View Post
Hi at 219, that's when the fan should kick in, maybe the loss of voltage is because of that , the fan draws a lot of voltage when running , check the 10amp fuse and connections at the fan switch could be a broken wire
P.S. have you checked with a separate source that the fan works
Fan isnt coming on because of the Radiator Fan Temp Switch.
I gounded the fan out and it worked fine.
Ordered a need switch but I now dont think thats the problem

What else should I look at?
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post #5 of 23 Old 08-03-2017, 4:49 PM Thread Starter
 
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Re: Voltage drop @220 degrees f4i HELP!

Quote:
Originally Posted by Jaybird180 View Post
The solution to your problem:......drumroll please....

The idle is too low. It should be around 1200. The charging system is discharging the battery below that.
Bike idles at 1500-1600 RPMs all the way up until the second the temp gauge says 220 then it drops to 1100-1200ish
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post #6 of 23 Old 08-03-2017, 4:56 PM
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Re: Voltage drop @220 degrees f4i HELP!

Could have a look at the ECT, but before that check the thermostat isn't stuck closed
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post #7 of 23 Old 08-03-2017, 5:03 PM Thread Starter
 
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Re: Voltage drop @220 degrees f4i HELP!

Quote:
Originally Posted by spagiratwink View Post
Could have a look at the ECT, but before that check the thermostat isn't stuck closed

The upper and lower coolant hoses get very hot.
Does that mean that the thermostat is open?
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post #8 of 23 Old 08-03-2017, 5:07 PM
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Re: Voltage drop @220 degrees f4i HELP!

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Originally Posted by MrEwubbsZ View Post
The upper and lower coolant hoses get very hot.
Does that mean that the thermostat is open?
If the lower pipe to the water pump is hot then the thermostat is operating properly, so could be ECT
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post #9 of 23 Old 08-03-2017, 5:22 PM Thread Starter
 
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Re: Voltage drop @220 degrees f4i HELP!

Quote:
Originally Posted by spagiratwink View Post
If the lower pipe to the water pump is hot then the thermostat is operating properly, so could be ECT
Any ideas on how to test the ECT?
Im having a hard time find any info online about the ECT.

Or even a part number?
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post #10 of 23 Old 08-03-2017, 5:26 PM
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Re: Voltage drop @220 degrees f4i HELP!

Quote:
Originally Posted by MrEwubbsZ View Post
Any ideas on how to test the ECT?
Im having a hard time find any info online about the ECT.

Or even a part number?
Have you got the manual
Page 5-16

Last edited by MrPickwick; 08-03-2017 at 5:53 PM. Reason: information
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post #11 of 23 Old 08-03-2017, 6:14 PM Thread Starter
 
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Re: Voltage drop @220 degrees f4i HELP!

Quote:
Originally Posted by spagiratwink View Post
Have you got the manual
Page 5-16
Awesome, Yeah I see it now.
Ill just this out here in a few minutes.
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post #12 of 23 Old 08-03-2017, 6:21 PM
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Re: Voltage drop @220 degrees f4i HELP!

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Originally Posted by MrEwubbsZ View Post
Awesome, Yeah I see it now.
Ill just this out here in a few minutes.
Should have had the fault code show up for it , but worth a check out
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post #13 of 23 Old 08-03-2017, 7:19 PM Thread Starter
 
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Re: Voltage drop @220 degrees f4i HELP!

Quote:
Originally Posted by spagiratwink View Post
Should have had the fault code show up for it , but worth a check out
ok, So the ohms SHOULD read, 2.3-2.6----- Mine is reading 2.03 ohms.

Volts SHOULD read , 4.75-5.25------- Mine is reading 5.1 Volts.


So, the ohms are out of tolerance by .27 ohms... Think that is enough to call the ECT bad?
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post #14 of 23 Old 08-04-2017, 1:37 AM
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Re: Voltage drop @220 degrees f4i HELP!

Quote:
Originally Posted by MrEwubbsZ View Post
ok, So the ohms SHOULD read, 2.3-2.6----- Mine is reading 2.03 ohms.

Volts SHOULD read , 4.75-5.25------- Mine is reading 5.1 Volts.


So, the ohms are out of tolerance by .27 ohms... Think that is enough to call the ECT bad?
Morning , just got up 6.20 here, assume ECT ok. Need to check 12v at the fan connector, between the Black/Blue and Green wire with ignition on, still could be the the Fan Motor Switch

Last edited by MrPickwick; 08-04-2017 at 2:07 AM.
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post #15 of 23 Old 08-04-2017, 6:40 AM Thread Starter
 
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I'm getting 11.75 volts at the plug
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