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Discussion Starter #1
i have a 99 zx6r and if i try to get on it, the bike will want to die. first gear is fine, but all the rest SUCKS. i have no clue on what to do. this is my first bike! it feels like it's not getting enough fuel or too much fuel. at times it will shut off completely...i would have to down shift and pop the clutch to re-start. any help would be GREAT!thx

forced inducted CRX
LS allmotor
ZX-6R
 

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Fuel system Diagnosis is always fun. Always remember to start simple and then get complex, not the other way around.

Had the bike been sitting unused for a long time? There might be varnish built up in the carbs, and they need to be cleaned. try a shot glass or two of Chevron techron fuel system cleaner in the tank.

Next you need to make sure that the gas in the tank is good, plentiful, and that the fuel cut off switch is in the proper position for the amount of fuel in the tank (you don't know how many people mess up on this).

Is the vent in the fuel cap restricted? Easy test is to open up the gas cap and try accelerating again. If it accelerates like a wild beast now, then you know what the problem is.

Next in line is the fuel pump. Is the connector attatched? Is the pump getting power? Is the fuse blown? Is the pump turning on? This will take a little detective work to figure out, and some digging. Its under the gas tank. and since you're down there, you might as well see if the fuel filter is plugged up or not.

After the fuel pump and filter, the gas goes straight into the carbs, and we come back to had the bike been sitting, and the carbs got varnished.

After you rule out the fuel system, then you have to start looking at the computer, and the throttle position sensor. Then you can move on to looking at the motor as a possible culprit.

But first, you should think back and ask yourself, did I make any changes to the bike recently, and ever since, has it been acting up?

When was the last time the bike ran perfect? What work have you done to the bike since then? Try undoing your old work, or atleast double checking it to make sure it's properly installed.

Good luck,
BC
 

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Discussion Starter #3
bladecutter thanks for the in-depth response. to answer a few questions...the bike has been riding perfect since yesterday when my buddy accidently tipped the bike over on it's right side. the only thing that was messed up was the brake lever and the signal light lens. after the drop, the bike was hard to start? it was cranking over but would not start. after a few attempts, she finally started up. the bike ran awful. it bogged down at low rpms, and at times would even shut off. everything seems fine though. the right fairing has a little scratch on it but that's about it. could dropping the bike cause all of this?

forced inducted CRX
LS allmotor
ZX-6R
 

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I'm a little confused. Did you friend drop it, and then it started running like crap, or did your friend drop it while it was running like crap, and now it is running fine? Your last post has thrown me for a loop.

I'll go on the assumption that it has been running bad since the drop on the right side.

When the bike was on its right side, there is an air injection tube in the front of the carbs. When the bike was tipped over, the fuel would have emptied out of the float chambers, and gone into this tube. When you straighten up the bike again, there wasn't any fuel in the carbs, hence the hard starting.

There are two possibilities for why the bike doesn't run right. First, the fuel has gotten into those air injection tubes, and is bugging things up as you push the engine for more power. The cure for this is to take off the tank, and open up the air tubes, and drain out any trapped fuel, or just ride the bike, and things should settle themselves out after a while.

Just go easy on the throttle. Slowly twist the throttle until it starts to stumble, and hold it there for a couple seconds. It should clear up as the fuel gets sucked into the engine and burned.

The second possibility is that during the drop, the floats in the carbs got knocked out of position, and as you accelerate, the carbs aren't able to supply enough fuel to run the motor. The cure for this is to open the carbs, and inspect the float heights on all 4 carbs.

These are the two items that are the highest possibility of being the culprit. Ita also possible that one of the spark plug coil sticks came loose from its spark plug, and needs to be pressed back into place. Plus about a dozen or more other possibilities.

Quickest way to fix the problem is take it to a trusted, knowledgeable bike mechanic, and let him troubleshoot it properly.

Good luck,
BC
 

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Discussion Starter #5
the bike was running fine before the drop. this all started when the bike was laid down. the bike was in neutral when it tipped over. he was not riding it or anything. i rode the bike yesterday and the hesitation went away for a little bit but came right back when i shifted into another gear. also, at idle it hesistates before it will rev up smoothly? it's not a smooth quick rev as i had it before? right now it's idleing about 1300 rpm's. the bike sounds fine...except for the hesistation. i'll pull the tank today and check the fuel lines, air injection hose, air filter, etc.

forced inducted CRX
LS allmotor
ZX-6R
 
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