Stalls/dies under acceleration when hot. - MVAgusta.net
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post #1 of 23 (permalink) Old 05-01-2017, 08:49 AM Thread Starter
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Stalls/dies under acceleration when hot.

Got caught in some traffic Thursday on my 2002 F4. Bike stalled out. It was the highway and traffic was stopped so I just pedaled it over on to a side road. It hadnt overheated, was just moving about between 92-96c in the slow traffic with the fan running but obviously everything, as usually, was toasty warm.

Bike fired right back up like nothing was wrong but when I attempted to accelerate to go down the off ramp it stalled, revved a bit then stalled again. I managed in that to at least get above a walking pace and coast a bit. While coasting at idle it stalled out again. Managed to get on to a shoulder and took a second for a breather. Thought I could smell gas (well, more than normal but it oculd have been venting from the tank from the heat).

Fired right back up and it ran for a block or so, kind of hesitating but would go, but then while cruising at a few thousand RPM it cut out a few times and then died again so I pulled into a lot. Gave it 15 minutes and tried again, just a few blocks again.

While waiting for a tow truck that never showed (I will be dropping State Farm over this, they screwed that up in every conceivable way possible) for an hour and a half the bike obviously cooled considerably. I rode it home without issue (intermittent issues, yay!).

So its obviously electrical but being that its new enough to have electrics but old enough to not have the diagnostics to tell me which one was reading out of spec any advice you have for tracking down what has become heat sensitive would be really welcome.


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post #2 of 23 (permalink) Old 05-01-2017, 08:57 AM
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Hi Ryan. Had you done anything since your previous successful ride?

FWIW, it sounds like a vapor-lock situation to me. Maybe an obstructed or pinched hose.

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post #3 of 23 (permalink) Old 05-01-2017, 09:49 AM Thread Starter
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Nothing other than top off the tank (but not overfilled and I dont have a charcoal canister).


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post #4 of 23 (permalink) Old 05-01-2017, 10:17 AM
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just a thought it could be running weak my brutale 910 did this for months only had 4000 miles on when i bought it
it was cutting out just like yours is, went back to basics TPS reset, co set, throttle bodies balanced, the bike runs better than it ever did
don't think it was set right from factory now starts on button and dose not cut out. it might help
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post #5 of 23 (permalink) Old 05-02-2017, 12:43 AM
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Try switching to AAA RV plus the bike is covered for towing! If the last thing you did was add fuel then dump it and refuel. See if you can put some in a clear jug and let it sit for a few days. If its bad it might separate. Might have water in it.

Was there a tanker dumping fuel where you got it? GL

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post #6 of 23 (permalink) Old 05-02-2017, 07:27 AM Thread Starter
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No fuel wasnt being dumped and its from a reputable place that I have bought fuel from for years.

Im going to start with replacing the hoses/seals on the tank. In doing so I would pull the fuel anyway. I did see a DIY set on how to do the TPS, what about the CO and setting the TBs?


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post #7 of 23 (permalink) Old 05-02-2017, 04:38 PM
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It does sound like fuel starvation.Maybe collapsed fuel delivery hose in tank.
Just a thought.


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post #8 of 23 (permalink) Old 05-02-2017, 11:14 PM
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Wink ?

Quote:
Originally Posted by mitchy View Post
It does sound like fuel starvation.Maybe collapsed fuel delivery hose in tank.
Just a thought.
.....no collapsed hoses in the tank ....... they're all at 3 bar ......the pressure regulator is on the tank return

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post #9 of 23 (permalink) Old 05-03-2017, 01:46 AM
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Quote:
Originally Posted by Ryan Stewart View Post
No fuel wasnt being dumped and its from a reputable place that I have bought fuel from for years.

Im going to start with replacing the hoses/seals on the tank. In doing so I would pull the fuel anyway. I did see a DIY set on how to do the TPS, what about the CO and setting the TBs?
I think you may have seen this:
BikeBoy.org - Weber Marelli Throttle Position Sensor Setting Notes and Procedures

2000 F4 750
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post #10 of 23 (permalink) Old 08-24-2017, 06:54 AM Thread Starter
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Can anyone confirm the part number for the TPS? 800085064? I found that looks like that in the manual but when looking at online parts stores its not labeled (most things have some sort of basic description) and a zero value, as in its not purchasable.


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