Loses power at 5500 rpm - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 18 Old 06-23-2019, 06:05 PM Thread Starter
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Loses power at 5500 rpm

I have just returned from a trip. On the road my 2006 DL650 started to lose power at about 5500 rpm, but only with a load on it. In neutral is was fine. On the highway I could barely keep up with traffic. I took it to a shop where they figured it was a problem with fuel delivery. So they cleaned the fuel filter and installed a new air filter. They checked compression which was fine, and electrical connection from the throttle which was also fine. At that point they were stumped.
I took it to another shop the next day. They also believed it was a fuel delivery issue. They replaced spark plugs just to be sure. And they said the old plugs indicated that the fuel was running lean. They drained the fuel tank in case it was some bad fuel. The mechanic concluded it was a vacuum problem because, he said, without the air box in, it ran great. He decided the problem was with the plenum boots (under the air box). The rubber was hardened and cracked at the ends. So he cut off the cracked hose ends, and on the bigger one, he tightened the bolts. It seemed to run a bit better, but it still struggles to make much more than highway speeds.
Lastly, let me mention that I can now hear a high-pitched whine periodically, like the sound of a slipping belt on a car (although not that loud; it's just enough to notice).
Any suggestions?
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post #2 of 18 Old 06-23-2019, 06:49 PM
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High pressure filter is likely toast, but they should've done a fuel flow test if they knew what they were doing. Chance the fuel pump is tits up too, but I would do a fuel filter bypass first and foremost if the fuel flow test fails or is even close to failing.
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post #3 of 18 Old 06-23-2019, 07:12 PM
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My recent purchase, a 2009 DL650, did exactly this. Tuned out it had been sitting for some time with ethanol fuel in it and the pickup filter etc was blocked with garbage. After cleaning everything out with carby/throttle body cleaner and filling with fresh fuel it's working properly again and getting better every time I take it out.

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post #4 of 18 Old 06-23-2019, 08:23 PM
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This may seem like a weird suggestion, but how is your battery and charging system? Fuel pumps can operate poorly if system voltage voltage is marginal.

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post #5 of 18 Old 06-23-2019, 10:08 PM Thread Starter
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I should add that when I say the compression was fine, it measured 43 psi, which is the correct pressure.
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post #6 of 18 Old 06-23-2019, 10:17 PM
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Pressure doesn't mean it has enough flow. Check the flow.

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post #7 of 18 Old 06-25-2019, 10:54 AM Thread Starter
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Thanks everyone. I'll check these out and report back.
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post #8 of 18 Old 06-25-2019, 12:12 PM
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Read up here:

https://www.stromtrooper.com/dl650-d...t-results.html

and report back what you find.

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post #9 of 18 Old 06-25-2019, 12:33 PM
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Quote:
Originally Posted by Big B View Post
High pressure filter is likely toast, but they should've done a fuel flow test if they knew what they were doing. Chance the fuel pump is tits up too, but I would do a fuel filter bypass first and foremost if the fuel flow test fails or is even close to failing.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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post #10 of 18 Old 06-25-2019, 04:00 PM Thread Starter
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My manual says I should get a fuel flow of 168ml in 10 sec.
I ran a test and got a measly 70ml!
My next step will be to follow Big B's advice and do a fuel filter bypass. I have seen the how-to on another forum.
I'll let you know how it goes.
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