ZX14R Runs Badly Above 5k RPM Under Hard Accel

Zerofucks said:

Thanks for the offer but I agree with your advice on going to a non-locking type cap. eBay & Amazon have a few nice CNC units to choose from.

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Zerofucks said:

Hi folks! New ZX14R owner and I'm also a new member here. Recently picked up a used 2014 ZX14R with only 4700 miles on it and have enjoyed learning about it. It appears it’s all stock except for the 2Bros slip-on pipes. I have recently changed the oil, took off the factory tires, and put on two new Mich PR4s.

Today I took it out of traction control for the first time and had it in full power and noticed an issue where it stutters, bucks and kicks very badly above 5k rpm under hard acceleration. So I pulled over, shut it off, and let it sit for about 5 seconds, cranked it back up and did a hard acceleration through first and second and it was fine! No stuttering. Right after that I slowed back down and put back in first gear and got back down on it hard again through first and second and then it went back to stuttering very badly in both gears above 5k rpm. It bucks and kicks so hard it slams me into and away from the gas tank hard. Damn near racked me. Tried the same scenario again: shut it off for about 5 seconds, crank it back up, then run it real hard through 1st and 2nd gears and it has absolutely no stuttering or misfiring on that 1st run. Slow back down to 10 mph or so, put back in 1st gear, punch down on it hard again and as soon as it gets above 5k rpm it starts bucking and kicking violently again. So I took it home and was like: “wtf?” Lifted the seat and poked around at some of the wiring, all looks good. Bike sat for about an hour and I decided to go back out and try it again. For about 15 minutes it was absolutely fine. I did 3 or 4 very hard accelerations through 3rd gear and it ran perfectly above 5k rpm. I mean to tell you that fuggin bike goes in beast mode big time! So I turn around and head back to the house and got down on it one more time and low and behold the issue came back! So I stayed out and rode it around for another 10 minutes and it still completely misbehaves above 5k rpm.

Anyone seen this type behavior before? Or maybe know where to start looking? Maybe remove the battery for a few minutes to reset the ECU? Or is there some other type of reset?

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Hammerhead said:

Simple things first. Most issues are found there.

I once showed up at an event to find an acquaintance ripping the wiring out of his wife's sportbike, bodywork completely stripped, multimeter in hand and scratching his bald head raw trying to figure out why it wouldn't start after being dropped on it's side in the parking lot. I picked up a stray paper clip, shorted the clutch switch and it fired right up.

Getting into the complicated shit first will make you look right past a simple solution.

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Zerofucks said:

Ok. Great tip y’all. Finally got into it. And the fuel filter was really clogged up with what looks like corrosion (grey metallic looking junk). See photos below. Coincidentally when I first got the bike in February the gas cap was really hard to open and I was worried about bending the damn key it was so hard to turn! There was a lot of surface corrosion on all the internal aluminum gas cap parts under the lid. So I took it apart, cleaned it up, greased the parts up real well, wiped off the excess, slapped it all back together, works great now, and didn't think another thing about it.

Background: The previous owner was a 70 year old dude that only put 800 miles a year on it and never rode it in the rain. The bike is showroom condition under the seat and inside the fairings – and I’m like: “hell yeah!” But I guess it sat in his garage with significant moisture in the gas tank for those four years and that’s where all the corrosion came from and now it’s all shitted up in the fuel filter.

So the service manual says:
“The fuel filter is built into the pump and can not be cleaned or checked.”
And
“If the fuel filter is suspected of clogging or being damaged, replace it with the fuel pump as a set.”

Where can I find a replacement fuel filter? Bike Bandit and the other OEM parts houses only show the fuel pump as an assy.

I will also have to clean out the gas tank real well before putting it back together.

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Zerofucks said:

Hi folks! New ZX14R owner and I'm also a new member here. Recently picked up a used 2014 ZX14R with only 4700 miles on it and have enjoyed learning about it. It appears it’s all stock except for the 2Bros slip-on pipes. I have recently changed the oil, took off the factory tires, and put on two new Mich PR4s. Today I took it out of traction control for the first time and had it in full power and noticed an issue where it stutters, bucks and kicks very badly above 5k rpm under hard acceleration. So I pulled over, shut it off, and let it sit for about 5 seconds, cranked it back up and did a hard acceleration through first and second and it was fine! No stuttering. Right after that I slowed back down and put back in first gear and got back down on it hard again through first and second and then it went back to stuttering very badly in both gears above 5k rpm. It bucks and kicks so hard it slams me into and away from the gas tank hard. Damn near racked me. Tried the same scenario again: shut it off for about 5 seconds, crank it back up, then run it real hard through 1st and 2nd gears and it has absolutely no stuttering or misfiring on that 1st run. Slow back down to 10 mph or so, put back in 1st gear, punch down on it hard again and as soon as it gets above 5k rpm it starts bucking and kicking violently again. So I took it home and was like: “wtf?” Lifted the seat and poked around at some of the wiring, all looks good. Bike sat for about an hour and I decided to go back out and try it again. For about 15 minutes it was absolutely fine. I did 3 or 4 very hard accelerations through 3rd gear and it ran perfectly above 5k rpm. I mean to tell you that fuggin bike goes in beast mode big time! So I turn around and head back to the house and got down on it one more time and low and behold the issue came back! So I stayed out and rode it around for another 10 minutes and it still completely misbehaves above 5k rpm. Anyone seen this type behavior before? Or maybe know where to start looking? Maybe remove the battery for a few minutes to reset the ECU? Or is there some other type of reset?

Click to expand...