F3 675 race bike - Need some help! - MVAgusta.net
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post #1 of 24 (permalink) Old 06-27-2018, 05:05 AM Thread Starter
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F3 675 race bike - Need some help!

Hi guys,

As stated on my introduction topic, Im racing a 675. Im used to race big twins and this triple is a little toy when compared with my Aprilia RSV 1000.

This bike is not a new bike (it was raced before) but its new to me and I came across some issues that Id like to see explained/solved.

1) Overheating : The bike overheats very easily and spits quite a large amont of coolant. I took the cap off and its deffective. But on top of that, the fan doesnt kick in when it should. I actually never seen it working!

2) The gear linkage seems to need some alignment. I made a couple of pics so you can help me with this.

3) I took a look at the manual and set-up the bike for track but I think I can take a lot more from it. In the dash menu I used the "S" mode because I had no idea how to fine-tune the custom set-up mode. Can you guys help me here with tuning the "Gas sensitivity", "Max engine torque" and "Engine brake".

Thanks in advance, guys!!!
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post #2 of 24 (permalink) Old 06-27-2018, 06:27 AM
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The coolant can be a simple fix to fill the small plastic container only up to MIN level, and not any higher when bike is cold.
Since your fan isnt working, it might be topped to MIN level but bequase of so much heat it poors out.

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post #3 of 24 (permalink) Old 06-27-2018, 07:48 AM
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do you have a race ecu. Maybe it does not have a program for a fan since most race bikes don't have fans
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post #4 of 24 (permalink) Old 06-27-2018, 09:59 AM Thread Starter
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Quote:
Originally Posted by Black_Gold_Saw View Post
The coolant can be a simple fix to fill the small plastic container only up to MIN level, and not any higher when bike is cold.
Since your fan isnt working, it might be topped to MIN level but bequase of so much heat it poors out.
Thats a good tip! Thanks!!!

MV Agusta F3 675 Race Bike
1999 Aprilia RSV1000 Mille
2003 Aprilia RSV1000 Tuono
1986 Jawa 350 Flat tracker
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post #5 of 24 (permalink) Old 06-27-2018, 10:03 AM Thread Starter
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do you have a race ecu. Maybe it does not have a program for a fan since most race bikes don't have fans
Im running the stock ECU. It must be something else that causes the fan not to work.

Whats the best way to test the fan? (without take the bike for a ride )

MV Agusta F3 675 Race Bike
1999 Aprilia RSV1000 Mille
2003 Aprilia RSV1000 Tuono
1986 Jawa 350 Flat tracker
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post #6 of 24 (permalink) Old 06-27-2018, 10:06 AM
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the temp sensor on the radiator may be bad. Make sure the connections are good. Not exactly sure how the circuit works. Don't know if the sensor opens or closes when the temp is too hot. You may try shorting the 2 leads together.
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post #7 of 24 (permalink) Old 06-27-2018, 10:29 AM
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Regarding the cooling issue, some members here have had success swapping out the OEM radiator cap with one from KTM, with a slightly higher pressure rating. Do a quick search here for the part numbers you need.
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post #8 of 24 (permalink) Old 06-27-2018, 04:15 PM
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The fan is only there to provide airflow to the radiator at a standstill. For a racebike you may as well remove it altogether.
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post #9 of 24 (permalink) Old 06-27-2018, 05:43 PM Thread Starter
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The fan is only there to provide airflow to the radiator at a standstill. For a racebike you may as well remove it altogether.
I had my fans removed on my other racebike.
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MV Agusta F3 675 Race Bike
1999 Aprilia RSV1000 Mille
2003 Aprilia RSV1000 Tuono
1986 Jawa 350 Flat tracker
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post #10 of 24 (permalink) Old 07-27-2018, 02:47 AM
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Quote:
Originally Posted by Gilles View Post
I had my fans removed on my other racebike.
Hi Gilles,
how are you getting on with the race bike build? i have nearly finished mine. hope to get some testing in next month if we get a dry September

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