F3 675 not revving past 8000rpm - Page 3 - MVAgusta.net
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post #21 of 33 (permalink) Old 04-03-2019, 06:26 AM
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Quote:
Originally Posted by airjawed View Post
I've seen it happen where the timing was physically off and that is how it behaves. Seeing that the OP bought it second hand and there are no codes and unknown history you must assume anything is possible.

You have seen an MV jump a timing chain tooth, or electronic timing issue?

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post #22 of 33 (permalink) Old 04-03-2019, 07:33 AM
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Quote:
Originally Posted by silentservice703 View Post
You have seen an MV jump a timing chain tooth, or electronic timing issue?
IF the bike had just had a valve adjustment, and the person doing the job missed the cam timing, the engine may lack top end power (or bottom end depending on whether it was advanced or retarded)

....but I am pretty sure jumping cam timing on its on isn't in the realm of probability (without significant other engine damage as well).

So.... did someone just do something with this bike's cams?

I think it is a mapping issue.
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post #23 of 33 (permalink) Old 04-03-2019, 07:39 AM
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Yes. but cam timing would not cause it to be limited to a specific RPM. It would run poorly throughout the rev range and be down in power.

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post #24 of 33 (permalink) Old 04-03-2019, 12:47 PM
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Quote:
Originally Posted by silentservice703 View Post
Yes. but cam timing would not cause it to be limited to a specific RPM. It would run poorly throughout the rev range and be down in power.
I agree, I have also seen an F3 cam sprocket move the Cam, result as you say, low power and loss of some RPM at full load but not down to anywhere near 8000.

Also I have seen a large 50% power loss and reduced RPM when the Exhaust valve is stuck shut, but again no where near the 8000 issue.

I agree that it sounds like an ECU limit, flash it and find out, dealer or aftermarket
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post #25 of 33 (permalink) Old 04-03-2019, 05:14 PM
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The reason i think it may not be ECU is that it revved past 8000 after a reset but then after a power cycle it then went back to 8k max. Otherwise, a 35 kw version seems logical. I think something basic is not correct and the ecu can't compensate.

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post #26 of 33 (permalink) Old 04-04-2019, 06:17 AM
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The ECU is the device that controls all of that.

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post #27 of 33 (permalink) Old 04-04-2019, 05:47 PM
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I know that and you know I know that.



What I'm saying is the injection timing and ignition timing has certain parameters. The ECU can compensate for some range of input but if the bike is mechanically outside of those parameters then the ECU and its mapping will not achieve proper power or RPM. ECU has many codes built in but you will always find a situation where there is no trouble code but still have a major issue.



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Originally Posted by silentservice703 View Post
The ECU is the device that controls all of that.

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post #28 of 33 (permalink) Old 04-05-2019, 05:55 AM
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Mechanical problems are seldom intermittent.

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post #29 of 33 (permalink) Old 04-05-2019, 08:15 AM
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Quote:
Originally Posted by Black_Gold_Saw View Post
Sounds like some sort of 35KW A2 license bike.

You bought the bike used?
Quote:
Originally Posted by Nett View Post
yes, bought it used. In neutral it would red line, but in gear it stops at 8,000rpm.
Quote:
Originally Posted by airjawed View Post
I know that and you know I know that.
I know this: It sounds like a 35kW bike. Electronically limited.

I also know that mechanical issue do not behave in this manner.

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post #30 of 33 (permalink) Old 04-05-2019, 08:36 AM
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Quote:
Originally Posted by Nett View Post
We went to Fire it up, they have the software. Seems like all the MV mechs are self taught. I will try your option thank you.

In order to have access to the MV Agusta software, you have to be a licensed dealer. Find yourself an AUTHORIZED LICENSED dealer and have them check things out.

Your bike behaves just like a 35kW version.

The ECU that you swapped into the bike...was it from another 675? Had it been "mapped" by that dealer?

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'07 Ducati Monster S4Rs ("Slightly" modded...), '07 Ducati Monster 695
2010 Harley Davidson Ultra-Classic Electra-glide CVO FLHTCUSEBLK
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