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Old 10-06-2012, 11:22 PM   #1
zayak OP
Joined: May 2012
Oddometer: 4
Question F650GS 2001 - Engine hesitates at high revs

Hey guys, hope you are doing great!

Yesteday my fuel warning light came on and continued using the bike for around 20 miles. 2 miles away from the gas station my bike started to hesitate at low rpms as if I was running out of fuel. I made it to the gas station and filled my tank with regular gas.

Today when fired up my engine everything went fine; I rode for around 100 yards but then the engine shutted down.

Tried to start it again, and it ran, but the engine stopped running the moment I released the start button. Tried it 3 times until it worked. Minutes later the engine shutted down again. Tried to start it again and it ran, but REVS went REALLY high (don't know how high since my tach does not work).

I decided to pull over and removed the BMS unit and wait some minutes; put the BMS back in its place and everything went fine.

However, when I accelerated and reached high RPMS to overtake, the engine would immediately decrease the revs, and then increased them, decrease, decrease them again, in a rythmical way.

Again I decided to reset the BMS by disconnecting it for half an hour, cleaned the battery terminals with sand paper, I also cleaned the terminal bolts and nuts.

I put everything back in its place, and placed the bike in central stand. I started it, left it some seconds idle and then reved it up. The problem was still there, ath high RPMS the engine hesitated, rythmically. Here a video where you can hear the problem:

While storing my tools back under the seat I noticed that there was a lose connection, near the gas pump but did not found where it plugs. The two plugs that plug in the gas pump were correctly placed.

Sorry for the picture and video quality.

Do you think the problem is related to this unplugged cable? Anyone has an idea where this cable plugs in? (I am attaching a photo of the loose plug).

Might it be accumulated dirt in the fuel filter? Faulty BMS?

Any other idea?

I have ridden this bike for 10,000 miles and never had this hesitation problem.

Thanks in advance,

All the best!


zayak screwed with this post 10-06-2012 at 11:43 PM
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Old 11-20-2012, 12:19 AM   #2
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Joined: Mar 2011
Location: Belgium
Oddometer: 420
did you ever find out what the problem was?
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Old 11-20-2012, 07:55 AM   #3
zayak OP
Joined: May 2012
Oddometer: 4
Thumb Problem solved

I found out the issue was related to the fuel injection system.

The iddle actuator device fuel filter-regulator intake were clogged with dirt. A thorough clean to the system was performed.

Problem solved!.
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