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studder studder stall

Old 08-19-2009, 11:36 AM
Thread Starter
Join Date: May 2006
Posts: 70
Default studder studder stall

My buddy is having some problems with his F4I, you guys got any suggestions???
So first time I had an issue-
I turned on the bike to let it warm up, went back inside, came back out a few minutes later and it was still running just fine... I sat on it and stood it up to get rdy to back out. It then started to studder and downa bit and stalled out. It turned right back on and did not do it again immediately.. It progressively got worse happening more frequently and estarted to not turn back on immediately.. I would have to wait a few seconds to even minutes before it decided it would start again (which was not fun when it happened at a stop light).

Sometimes it would go an extended period of time with no problems but it always comes back.. Its been through a few cycles of gas so its not bad gas.

We took the tank off and cleaned up the sensor thats right under the tank (I dont know what sensor it is).

Things I've noticed:

Sometimes the FI light will come on and stay on after it stalls out, but goes off immediately after turning the key and starting again

Sometimes the whine from the fuel pump will stay on after it stalls and sometimes it doesnt

when i was on it the other day the pump stayed on and when i went to put the kick stand down i kinda kicked it and it went off.. i kicked it again and it came back on
Old 08-19-2009, 02:17 PM
RojerLockless's Avatar
Retired Moderator & The Big Deal
Join Date: Jul 2005
Location: Houston TEXAS
Posts: 2,600

get a socket wrench and tighten the crap out of the battery line down and make sure it is snug and not dirty. 95% of the time that's the problem
Old 08-19-2009, 02:50 PM
Aken's Avatar
July 2008 ROTM
Join Date: Oct 2007
Location: Milwaukee
Posts: 3,002

Yeah, definitely based on the last sentence it sounds like loose electrical connections somewhere. Battery is the best place to start.

Just a note on the FI light, it will come on and stay solid if the bike stalls like that (see what happens when you stall taking off in first once). It doesn't mean there's anything wrong, just means fuel injection isn't on.
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