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Old 08-13-2008, 07:00 PM   #1 (permalink)
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Joined: Aug 2008
From: West Virginia

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Problem with bike. Please Help

I am a newbie. I just got my 97 ZX7R a week ago. This is the 1st bike I have ever had. Now on to the problem. This has happened twice now. When riding everything is good then suddenly the bike starts to bog down won't rev pass 4000 rpm's. I've had to pull the bike off the road. I let it set there for a few min. gradually reving the throttle, and after about 3-4 min everything is back to normal. Then it rides fine and no more problems.

Any suggestions

Josh
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Old 08-13-2008, 08:06 PM   #2 (permalink)
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I'd start with checking the fuel filter. What kind of add-ons are on the bike? Like exhausts and has it been jetted. I'm sure somebody else can add a lot more.
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Old 08-13-2008, 08:11 PM   #3 (permalink)
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not sure whether it has been jetted but it does have an aftermarket exhaust
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Old 08-13-2008, 08:13 PM   #4 (permalink)
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Another thing that it might be is some kind of vaper lock. I had that problem on a car once and change the gas cap and all was well again, not sure if that would translate to a bike thou.
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Old 08-13-2008, 10:47 PM   #5 (permalink)
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Josh. Welcome to ZX7R ownership.
You're going to love this bike.
Anyhow. Looking at the book, you're going to have to think of carburation LAST.
The fuel goes from the tank,through the petcock, to the filter, to the pump,than to the carbs.
So I would do I few things. Since this is your bike and you will have to get used to working on it to understand what is going on with it.
Go ahead and remove the tank.
remove the airbox.
switch out the plugs for new ones. never trust "it has new plugs"
pull the plug wires out of each boot and cut 1/4 inch off the tip and reapply the wire to the boot. apply di-electric grease to all connections.
if the oem foam filter (airbox) is deteriorated, replace it.
if it has the original fuel filter,replace it as well.
empty out the tank and remove the petcock and see if there is any debris in it's orifices.
I had to do it to mine.
I knew it may seem like alot, but believe me. you have to check these things.
Sounds like something is impeding the flow of fuel. intermittently.
The fact that you have to let it sit, tells me that the fuel has to somehow settle, than it starts after that.
Now MDstriker did bring up a good point. The tank does have to vent as the gas it suctioned out of it by the fuel pump. If there was no way to vent the tank, the pump would run empty as it tries to pull more gas out of the tank.
Check to see that your vent (on the left side of the bike by the clutch, it should be next the drainage tube for the air box. make sure the vent tube is not kinked in anyway. if you open up the tank,and blow through the tube,place your hand on the open tank and you'll hear the sound change as you move your hand. that is the vent tube for the tank.
Like I said, sounds like you are waiting for it to equalize before it will start running again.
-Frank
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Old 08-14-2008, 07:16 AM   #6 (permalink)
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Thanks for the info. I did buy new plugs and replaced those allready. I will try the rest of your suggestions later today.

thanks
Josh
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