Question about kawasaki VN 800 Vulcan Classic Motorcycles

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Very slight backfire with throttle decrease. Lack of power when throttling up while cruiseing. Can you assist with some basic pot settings? Thanks, Jim Grider (317) 319-8131 P.S. I own a 2007 Vulcan VN900 Classic LT.

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  • james_r_grid Jul 31, 2009

    My Vulcan 900 is fuel injected and the gas is not an issue. The problem IS with the fi2000 pot settings. Thanks, Jim.

  • james_r_grid Jul 31, 2009

    The solution was right on the money! It turned out there was a leak at the intake. Thanks, Jim.

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Could be fowl plug, to much gas in carb and needs adjustment, To much air flow due to leak in intake seal

Posted on Jul 31, 2009

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Hi...
There are few things which you should check that cause backfire and power loss.
Use a higher-grade fuel for a while to help clean your fuel tank. You may have ended up with a tank of dirty gas that's causing some problems with your fuel injection.
Buy a can of fuel-injection cleaner that goes into your gas tank. This will clean out debris and dirt from the tank that's getting into your fuel line. Check with your motorcycle owner's manual or the manufacturer's recommendations to make sure this is safe for your particular motorcycle.
Check to see if the jets are clogged with debris or thick "gunk" that's causing your motorcycle to backfire. This will also cause problems with the fuel efficiently getting through the engine.
Take a close look to see if you have a dirty carburetor. The fuel will not be able to run efficiently through the engine with a dirty carburetor.
Visit your favorite motorcycle mechanic for an evaluation of the backfiring situation. Your motorcycle may need a complete engine cleaning to solve the backfiring problem.

Thanks
Smith

Posted on Jul 31, 2009

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Your scooter may have lost its inhibit resistor 10k resistor that some scooters had on the center post of the throttle pot to stop this from happening. but the throttle has to be out of neutral position in order for it to move on startup. The throttle pots are normally 5k ohm pot, about 2.5k from the center to either outside posts. It would be wise to replace the speed control and the throttle together. Basically the controller thinks it is being told to go right at start up, that comes from the throttle.

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hi, 7 flashes implies the throttle lever (speed pot etc) is not in the correct position, other words not dead center, (PGDrives S -Drive Controller)

Let me explain , the pot in question is a 5K value and the throttle lever rests in the center of that about 2.5k give and take

If you can see the bottom of the metal stem in with the throttle lever is mounted there should be a cross head slot now that should be dead center, the slot facing you as you sit on the scooter, slightly off center will cause the fault reported.


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www.gewizrepairs.co.uk


Please rate my assistance.

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1. Fuel filter- If this device is clogged, or faulty, it will decrease the flow of fuel to the injector assembly. If the filter hasn't been changed recently, this will be a good place to start.

2. Fuel pump- This device may be weak, or grounded poorly. check the ground, and all wires the link the pump to the power source. replace any corroded contacts and connectors. wires,as well, if needed.

3. Fuel pressure regulator- The fuel pressure regulator is used to keep the fuel pressure in the fuel rail consistent and change the fuel pressure depending on the throttle position. The fuel rail is in a fuel loop between the fuel pump feed and return lines. Because the fuel delivery requirements change depending on the engine's throttle position and engine loads, the fuel injection system must be able to adapt to meet the fuel requirements of the engine's operating conditions during idle, acceleration and steady cruising.The fuel pressure regulator has a small vacuum line attached to it that allows the pressure regulator to change the fuel pressure in the fuel loop depending upon the intake manifold pressure which changes as the throttle position changes. When the throttle is opened, the manifold vacuum pressure drops off, causing the pressure regulator to increase the fuel pressure in the fuel loop, which increases the amount of fuel delivery at the injectors to provide for the additional fuel needed for the engine to operate properly.At idle, the manifold vacuum increases and the demands for the rate of fuel delivery are decreased so the pressure regulator decreases the fuel pressure in the fuel loop.

1. Look for visible evidence of fuel leaks.
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The result will be hard starting, poor idle quality, and lack or power. Burned spark plugs can result from operating with a lean air/fuel mixture, as well. replace this device if faults exist.

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