2002 F4 Senna sluggish first gear, random shut offs, help please - MVAgusta.net
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post #1 of 18 (permalink) Old 09-05-2013, 02:12 PM Thread Starter
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2002 F4 Senna sluggish first gear, random shut offs, help please

Hi guys,

I've had this bike for a month and have had no issues until this morning. First off while it idles it sounds a bit weak. Starting off in first gear is awful. It's very sluggish and doesn't kick in until more throttle than usual. I haven't noticed any issues with the other gears and when the bike is at speed it's very smooth. The last issue is when I pull the clutch in and come to a full stop and sometimes just before, the bike will shut off. It fires backup right after though. Any thoughts?
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post #2 of 18 (permalink) Old 09-05-2013, 02:50 PM
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Fouled plugs? Idle speed a bit low, needs tuning??? TPS setting is off (part of tuning)....Those are my ideas.

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post #3 of 18 (permalink) Old 09-05-2013, 03:45 PM Thread Starter
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Thanks! I was just outside letting it idle in neutral. It would cut off after about a minute or so. Do you thinkthiscould bea fuel filter issue? The Bike had 18k miles on it when I got it and who knows whit was last replaced.
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post #4 of 18 (permalink) Old 09-05-2013, 04:13 PM
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Fuel filter and fuel lines would be my guess.
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post #5 of 18 (permalink) Old 09-05-2013, 04:22 PM
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Since you don't know the service history, I'd start by performing all the necessary work. That way you have a good baseline for future maintenance.

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post #6 of 18 (permalink) Old 09-05-2013, 04:54 PM
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All good advice....you said it runs okay above idle and on the gas??? That probably rules out the filter, but old dead E10 gas residue in the injectors could be a cause.

Besides replacing the filter and other basic maintenance (brake fluid, coolant, etc) try dumping a good dose of a quality fuel injection system cleaner in the tank....

And start using ethanol gas treatment (several good choices out there...I like StarTron and LP Ethanol Equalizer).

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post #7 of 18 (permalink) Old 09-05-2013, 05:13 PM
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Sound advice I use star-tron in every tankful great stuff.
Do the plugs to for good measure and air filter .
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post #8 of 18 (permalink) Old 09-05-2013, 07:10 PM Thread Starter
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Thanks for the help guys! I just filled it up a few days ago. Should I drain the fuel and then add the injector cleaner with new gas? Or can I just add it to what's already in there? Also are there any web sites or downloads/videos showing the proper tank and air box removal? I have found only written instructions but I'm a visual guy haha.
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post #9 of 18 (permalink) Old 09-05-2013, 08:26 PM Thread Starter
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I just got back from a 5 mile round trip to advanced auto. The bike shut off at every traffic light. First gear starts are sluggish, similar to if your going uphill in the wrong gear. I also noticed that sometime with a quarter turn of the throttle, there is no response, then all of a sudden it kicks in. And occasionally i hear a light "tick" when im on the throttle. I bought a siphon and some sea-foam. That was the only thing they had that mentioned motorcycle engines on it. Is sea foam ok to use? I just don't understand how everything was fine yesterday and the past month and then all of a sudden I'm having these issues. I really hope it's not a thousand dollar problem. The semester just started and I'm going to be low on funds for a while which is why I'm hoping I can figure this all out and fix it on my own.

I failed to mention that the bike got up to 280 degrees in game day traffic last week. I didn't notice since it was already hot out until a cop pointed out that I had coolant leaking all over the place. The temp jumped quickly as it was right at 190 when I hit traffic and I must have been sitting for about 10 minutes. I shut it off and let it cool down. It started up and I've had no issues until today. Do I need more coolant? Does the overheating have anything to do with my current issues? I wouldn't think it would considering I've been driving it every day since then. Can someone please reach through my screen and smack me in the face?

Last edited by Crunknasty; 09-05-2013 at 09:11 PM. Reason: Forgot to mention something
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post #10 of 18 (permalink) Old 09-06-2013, 06:10 AM
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Don't sweat the momentary overheat. Only add coolant if the level is below the minimum mark on the tank when cold, and only to the minimum mark.
You may have just bought some crap gas. Seafoam is fine....any automotive fuel injection system cleaner will be fine.
You can buy Startron at WalMart in the fishing gear section (originally created for outboard engines...they really hate ethanol).

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