2008 DL650 - Idles fine, dies on revs > Help please! - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 25 Old 03-30-2019, 06:40 PM Thread Starter
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[Solved] 2008 DL650 - Idles fine, dies on revs > Help please!

The bike has just over 60k miles. I bought it about 5k miles ago. It's ran great since then, has had recent valve check and spark plug change.

Problem:
  • Last time I parked it, a couple weeks ago after a long ride, it was fine. A couple days later, I noticed fuel leaking from the exhaust joint under the engine (near the oil filter). Gas had gotten into the front cylinder and hydrolocked it.
  • I pulled the plug and turned it over a few times to get the gas out. I suspect the front fuel injector had failed, or clogged open.
  • I took the front fuel injector off, looked at it, jiggled it, and put it back in. Then I cleaned the air filter and put the bike back together.
  • Now it will start, but takes longer than usual, it runs under idle, but will die with >10% throttle.
    is a video of it idling and then dying.

Is this consistent with a failed fuel injector, or is there something else going on?

Should I just get a throttle body off ebay and call it a day?

Thank you!


Edit:
Solved! See comment 22.

Last edited by rudolfs001; 04-24-2019 at 12:22 AM. Reason: To say the issue is solved
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post #2 of 25 Old 03-31-2019, 03:59 AM
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You say that you have pulled the plug on the front cylinder... did you pull both plugs on that cylinder or only one of the plugs? Were the spark plugs wet after the engine died?
Have you done a fuel flow test? See https://www.stromtrooper.com/dl650-d...t-results.html or https://www.vstrom.info/Smf/index.ph...c,11603.0.html
Similar idle complaints reported, https://www.stromtrooper.com/dl650-d...bug-ideas.html and https://www.stromtrooper.com/dl650-d...le-riding.html
Sorry, it's going to be a process of elimination.
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post #3 of 25 Old 03-31-2019, 09:46 PM Thread Starter
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Thanks for the info Gert!

I haven't done a fuel flow test.

I pulled the side plug on the front cylinder, it was wet. Should I have let it dry before putting it back in?

I left the other plug in, since I figured one hole would be enough to get the gas out. Is there any reason to pull both?
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post #4 of 25 Old 04-01-2019, 03:39 AM
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Yes, always dry the plug, for better spark and helps diagnosing later. The 2nd plug could have been overlooked for a while. Pulling both plugs will give you chance to inspect them, for overall condition.
The fact that the spark plug is wet, means that there is fuel in that cylinder, so it appears as though either there may be no spark on the plugs, or sparking at the wrong time or the valves are not closing / opening correctly.
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post #5 of 25 Old 04-01-2019, 01:53 PM
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Front spark plug firing at all? Check temp of exhaust pipe when idling. Or get a spark checker.

2012 Suzuki DL650AL2, over 45k miles already!
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post #6 of 25 Old 04-02-2019, 02:01 AM Thread Starter
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Quote:
Originally Posted by Gert View Post
Yes, always dry the plug, for better spark and helps diagnosing later. The 2nd plug could have been overlooked for a while. Pulling both plugs will give you chance to inspect them, for overall condition.
The fact that the spark plug is wet, means that there is fuel in that cylinder, so it appears as though either there may be no spark on the plugs, or sparking at the wrong time or the valves are not closing / opening correctly.
The spark plug was wet because the cylinder was hydrolocked with gas. It was only after putting the plug back in that it seemed the front wasn't firing.

I'm planning to pull them tomorrow and check for spark. Will update.
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post #7 of 25 Old 04-07-2019, 02:53 AM
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Have you had a chance to do any further diagnostics? If so, care to share your finding?
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post #8 of 25 Old 04-07-2019, 04:08 PM Thread Starter
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Quote:
Originally Posted by Gert View Post
Have you had a chance to do any further diagnostics? If so, care to share your finding?
I put in a new (ebay used) front fuel injector. Checked for spark on the front side plug (had spark). It started easier, but still died with a bit of gas. I noticed that if I gave it a lot of gas, it would rev up, but the revs would be very unstable, surging up and down. Took it for a ride around the block, and it felt like at a given throttle, the gas input would swing wildly from 20% to 100%.

I checked and tightened the airbox fittings, still the same surging.

Planning to get a measuring cup the next time I'm at the store and do the fuel flow test. I suspect the airbox side throttle body valves might not be working correctly. Whether the motor is dying, or there's a poor electrical connection, I don't know.
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post #9 of 25 Old 04-07-2019, 04:42 PM
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If you fuel flow is reasonable, even if not up to full specification, I would suspect the TPS. They are known to cause low rpm throttle response issues. Normally a partially plugged up fuel pump manifests itself at elevated rpms, like 5k or 6 k because the engine is starved for fuel whereas everything is "normal" alt lower engine load. My bike ran fine but pushing it up a mountain road it would not accelerate past 6k. Fuel flow was about 1/3 of specification.

Please confirm: The bike ran normal after the valve check and plug change? Approximately how many miles since that work was done?

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Last edited by blaustrom; 04-07-2019 at 04:48 PM.
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post #10 of 25 Old 04-08-2019, 07:08 AM
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You don't really need a measuring cup. I made use of a 2 liter soft drink bottle and marked the levels with a sharpie / marker pen, after filling with a known volume of liquid.
Count how many coffee cups / mugs it takes to fill the container and then ask your good lady advice on the liquid volume a single cup holds...
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