WTF! My F4 dies when temp hits 220F' - MVAgusta.net
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post #1 of 23 (permalink) Old 09-08-2013, 12:30 AM Thread Starter
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WTF! My F4 dies when temp hits 220F'

Ok - So I went for a ride today from Brentwood to San Jose - est 68 miles one way. The temperature when I left was 92F' and the F4 was varying between 186F-203F' on the Freeway. Once I got to San Jose, I was riding 35-45 MPH on the street when I noticed that the temperature on the F4 had reached 220F at the stop light. Sure enough - the F4 just died. So I tried to re-start the bike and nothing. She would crank but would not start.

My buddy pulled to the side and helped me push the F4 to the side of the road. As usual - she dripped some coolant and stopped. About 5 minutes after, I checked the temp and it was at 190F. I again tried to start her and she started but died in 2 seconds.

I let her cool down for 30 minutes and attempted to start her. She started right up as if nothing had happened. Again - going through mid-town traffic I hit 209F and she started to sputter and again died at a stop light.

I waited until 6 PM when the weather started to cool off and rode straight back home. As soon as I hit my driveway - she gain hit 209F and died.

I have not checked anything yet as it has been a long day but will do so tomorrow. This is the 1st time I have experienced this sort of an issue on the F4 and curious if anyone else has come across this issue and what's the root cause?

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post #2 of 23 (permalink) Old 09-08-2013, 04:01 AM
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220 deg F is only 104 deg C. It sounds too low for the bike too activate its saftey mechanism which shuts the bike down after 122 deg C or there abouts.

Start by checking the 40 amp fuse under the left hand side fairing. Maybe its beginning to burn out snd thrn check all other fuses.


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post #3 of 23 (permalink) Old 09-08-2013, 10:40 PM Thread Starter
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Originally Posted by wnehme View Post
Start by checking the 40 amp fuse under the left hand side fairing. Maybe its beginning to burn out snd thrn check all other fuses.


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Thank you for the response. I checked the fuses and all looked good. Looked at oil/coolant/vents/etc. and nothing. I also checked my Microtec wiring and all is well.

I am stumped and will again go for a ride next Sat and see if I can reproduce the issue.

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post #4 of 23 (permalink) Old 09-08-2013, 11:08 PM
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check your rear light cable where you lock the tail, it might be burn right there.


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post #5 of 23 (permalink) Old 09-08-2013, 11:49 PM Thread Starter
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check your rear light cable where you lock the tail, it might be burn right there.
Thank you Phill. I have not checked that and an oversight on my part but will do so. Thanks

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post #6 of 23 (permalink) Old 09-09-2013, 02:14 AM
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I once ride my f4 in summer when both my fan stop working due to the heat that then fried my fan wire (exposed then guessing a short circuit happened). My bike heat up to 140C on a stop light then it goes to --- it is when it start bursting all the coolant. So I'm guessing the highest temperature f4 can read is 140C but even that my bike still running.
So my opinion, it could be something to do with ur wire and heat. Not that the engine couldnt handle the heat.

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post #7 of 23 (permalink) Old 09-09-2013, 03:22 AM
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As usual - she dripped some coolant ..........

That's not usual as such and suggests that you have air in your cooling system. I'd purge the air for starters and improve your cooling efficiency...

Check that the dripping coolant isn't making it's way into your side stand switch......

CPS wires where they emerge on the left of the bike ( F4 Cover ) are prone to damage and can cause your symptoms..


good luck : )

joe

Last edited by gotojoe; 09-09-2013 at 06:00 AM.
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post #8 of 23 (permalink) Old 09-09-2013, 06:51 PM Thread Starter
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Originally Posted by gotojoe View Post
As usual - she dripped some coolant ..........

That's not usual as such and suggests that you have air in your cooling system. I'd purge the air for starters and improve your cooling efficiency...

Check that the dripping coolant isn't making it's way into your side stand switch......

CPS wires where they emerge on the left of the bike ( F4 Cover ) are prone to damage and can cause your symptoms..


good luck : )

joe
Thank you Joe. I will also check that as well.

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post #9 of 23 (permalink) Old 09-09-2013, 07:44 PM
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Dr. Duc;
are the fans running when it dies?
fan wires shorting to ground? thats about the temp when most stock F4s fans come on

just a thought

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post #10 of 23 (permalink) Old 09-09-2013, 08:06 PM
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An excellent observation. Don't know much about Microtec but could you set the fans to come on at a lower temp to narrow it down?

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Dr. Duc;
are the fans running when it dies?
fan wires shorting to ground? thats about the temp when most stock F4s fans come on

just a thought
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