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Old 09-20-2013, 11:02 PM   #1
munstro OP
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Joined: Sep 2013
Location: Northern Az
Oddometer: 25
2008 990 stalling

Hello everyone, this is my first post but i have been using this site a lot lately since I bought my 2008 990S. All of my past experience with motorcycles was single cylinder dirt bikes, mostly two strokes. Anyways, I bought the bike on a whim from the second owner who was a trustworthy appearing gentleman that as far as I could tell used it strictly for road riding. He stated that he rode it on dirt once and it simply scared the crap out of him. He also said that the bike had always ran excellent and never gave him any problems which I took to be truth. The valves were recently checked, and he never had any problems with the water pump and knew it to be a potential problem area. It has 18000 miles on it, so I figure the bike is tried and true. On my first real ride, an 80 mile loop dirt mixed with pavement the bike ran flawlessly, and continued to run great the next few rides. I quickly fell in love. Today however the bike suddenly started running poorly. I first noticed it acting up after a second gear start at a stop sign. The bike popped and fluttered and almost died. I proceeded to ride some pretty rough low speed first gear double track and the bike felt fuel starved. I know I'm being pretty vague in my description of my problem, the easiest symptom to describe is at idle it will erratically go from 1.5k RPMs to 1k and back up and eventually stall.
I have spent the past few hours reading old threads but haven't been able to come up with much. It seems many people have had to replace fuel filters and pumps at around 20k miles. In some of the older threads problems similar to mine seem to have been solved with re maps, and I know mine had a stalling issue worked out by the first owner via a re map. I also know some of these issues were resolved with new batteries. I'm fairly certain the battery in the bike is pretty new. One other thing to note, between 3-5k RPMs in 4th gear mainly, the bike feels jerky. I'm not sure if this is the dreaded throttle issues with the early EFI or not. I called the guy I bought it from and asked him about this and he said he never really noticed it. Any info on where to start would be great. Thanks.

munstro screwed with this post 09-20-2013 at 11:15 PM
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Old 09-20-2013, 11:45 PM   #2
nordicbiker
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Just a quick idea about a simply problem: have you checked all those rubber tubings between/around the tanks? It's easy to squeeze some of the tubings, when mounting the tanks - for the left side tank you will wish you had three hands, at least...!
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Old 09-21-2013, 08:31 AM   #3
Hootowl
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Ask the previous owner when the fuel filters were changed last.
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Old 09-21-2013, 08:45 AM   #4
Katoom119
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+1

Fuel Filters. I changed mine in my 08 at 16,000 and they were horrible looking.

You said you used to ride two-strokes? Well, mine was starting to do the stumble/hunting idle until I changed mine and it cleared all that up. It was like when I rode my old two-stroke, forgot to turn on the petcock, and burned all the gas out of the bowl.



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Old 09-21-2013, 09:58 AM   #5
Overcomb3
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Check fuel filters.

Mine made it to about 20000 miles before it quit. Drop the fuel pump and get those filters changed. That would be 1st priority if I was you.
Good luck.
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Old 09-21-2013, 11:49 AM   #6
Cyath
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A word of caution, that I'm not sure is real, or just my bad luck. I ran in to the same situation, and I changed my fuel filters at around 15K. They looked just like those in the pictures. Bike seemed to run better right after, and a few days later refused to start. It would crank and crank but not turn over.

Posted a thread and tried everything fellow inmates suggested. Finally took it to the dealer and they said my fuel pump had crapped out. The pump was working, but a pressure test showed it was it was too low. About $500 for a new one. You have to buy the whole assembly, you can't just buy a new pump.

Not sure if the pump was going to fail anyway, or if something I did on re-install was the culprit. I was careful to follow all the instructions on how to properly change the filters and reinstall the pump, especially filling the tank before turning on the key.
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Old 09-21-2013, 12:21 PM   #7
munstro OP
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Thanks for all the replies fellas. I actually dropped the bike off at the shop today because it is still under an extended warranty which I'm hoping will cover a fuel pump (if that's the issue). The man at the shop initially was thinking it may be more electrical but as I explained the symptoms to him he started to think maybe a fuel issue. I'll keep posted and thanks for the recommendations. Darn it I wish I was riding today!
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Old 09-21-2013, 08:18 PM   #8
munstro OP
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Update on my scenario. The previous owner who has been super cool since I bought the bike from him states no fuel filter changes that he's aware of. He bought the bike at about 8000 miles. Please let it be something relatively easy. Oh, and weed eating on the first rideable day in a month (between weather and work) in northern Az? Yeah it sucks!
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Old 10-06-2013, 05:58 PM   #9
munstro OP
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Well the shop figured out my situation. Seems the previous owner forgot to take the cap off the front spark plug when he changed them. Got her back and shes running like a champ. I sure hope he didn't work on the bike too much! The kick stand shut off sure did scare the heck out of me today though (I know I'm a total noob).
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