Zx6r running problems please advise

[dudders7]

Hi all, well I have put my faithful old kwaker through a lot of hard work the last month as I am currently touring Australia, since I dropped her a while back she's having intermittent problems with acceleration. She revs right up in low gears no problem, the moment I get up to 160kph she loses all power, so I cleaned the air filter, changed the plugs, drained the carbs, and I have just pulled the fuel pump out and checked that is working and it seems fine. It's got the ram air system so I was wondering whether the excess air pressure at those speeds was causing it but I does not feel like that sort of issue. The moment I roll off the throttle and accelerate again she's fine but just won't go above 8k revs in high gears, pulls like a train up to 160 but not above, but then on other days she will rev just fine. I await any advice, I'm going to pull all the fuel pump connections apart and see if that gets me anywhere. Thanks all
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Riding in the sun in Australia on a 04 Worked ZX10R along with a fleet of other crazy toys

[Turkish]

What year?

You said you've looked at the carbs, perhaps a dodgy throttle position sensor?
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ZX-6R G2
CBR125R RW6

[dudders7]

It's a 95, not sure yet as haven't had a chance to try her on an open road as it involves going down a twisty mountain road and I couldn't be bothered this afternoon, but I think the fuel pump had a dodgy connection. Will take her for a ride in the morning. Too many beers in me to try now!
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Riding in the sun in Australia on a 04 Worked ZX10R along with a fleet of other crazy toys

[dudders7]

Ok I went for a ride today and the problem is still there. Just been reading a similar post on the Kawasaki Forum about a zzr600 which is revving up to 13,000 and then wont pull anymore unless you back off the throttle and rev her up again. Someone said on there it may be the jets, although I am pretty sure my bike has an uprated jet kit as she has a lot more grunt at low end than most ZX6R's. Perhaps crap in the jets? Running too rich? Fuel pump is working with no obstructions. Any ideas guys, I am really stuffed on this. She has started doing this in 3rd gear. I went for a ride after I set the suspension up properly and I had two occasions where she lost power, I backed off the throttle and she came back. Although on the bright side she has never handled so well through the corners before!!
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Riding in the sun in Australia on a 04 Worked ZX10R along with a fleet of other crazy toys

[Pete.]

Try riding it with the fuel cap unlocked.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[dudders7]

[Pete.]

[wilz1234]

Is the bike an import? I know with certain models the jap imports are limited to 112mph (not too far off what your reaching)
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RS50 - ZXR400 - ZXR 400 - ZX7R - Bandit 600 - NTV 650

[cb1rocket]

Does sound like an electronic limiter. Has the bike just developed this fault or was it like this when u got it?
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Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852

[Pete.]

[dudders7]

Not an import, no limiter. She used to pull like a train right up to the top. However I did remember something that may be an issue, the fuel cap hisses when the tank is warm. Could be the tank breather perhaps?
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Riding in the sun in Australia on a 04 Worked ZX10R along with a fleet of other crazy toys

[cb1rocket]

[dudders7]

Ok there was a cap on the breather so took that off and just been for a spin. Made no difference, the strange part is she only does this losing power thing at speed in the top 3 gears. In fact it's probably a good thing she won't go too fast due to a $513 speeding fine I got a couple of weeks ago! Still would like my pride and joy working properly.
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Riding in the sun in Australia on a 04 Worked ZX10R along with a fleet of other crazy toys

[MaybeGuy]

try cleaning the carbs rather than just draining the bowls, could have dislodged some shit.
I reckon your clearances are probably overdue too, considering all the pops and bangs on the overrun you were getting.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[dudders7]

[dudders7]

Well I spent the afternoon in the workshop stripping the carbs pulling all the hoses apart and all the electrics. Carbs were reasonably dirty and the jets were partly blocked. Leaned her out a fraction aswell as she was slightly rich. Went for a quick ride down the road and she feels a lot better! Not sure if the problem is cured yet as haven't been on the the straights but she pulled a lot better upto 130kph before I hit a hairpin and had to slow down. So the test will be tomorrow if she pulls past 140. I feel confident it could be fixed though
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Riding in the sun in Australia on a 04 Worked ZX10R along with a fleet of other crazy toys

[MaybeGuy]

the mixture screw won't change the top end power. Chances are all you've done is made it idle like a dog.

Bikes don't just "become rich" on a carbed bike unless something gets worn out like the needles.

How do you know it's rich? Popping on the overrun? or have you actually had it confirmed by emissions/dyno/colortune?
Valve clearances being out would cause the popping, and I wouldn't trust clocks at all to gauge mileage in terms of service intervals.

You're a nice guy, but some of the stuff you type is utter bullshit

pot kettle black? give a fuck
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[dudders7]

Actually Mat it has improved the idle, reduced the popping and responds a lot better. Read the post the jets were blocked up and now clean=big difference. What the fuck is bullshit about that? Are you here riding the bike, no your not.
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Riding in the sun in Australia on a 04 Worked ZX10R along with a fleet of other crazy toys

[MaybeGuy]

https://global3.memecdn.com/sshh-baby_o_1779485.webp

you "leaned it out" because you somehow "knew" it was rich
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[dudders7]

Yes because I have just ridden 6000kms and you get to know your bike pretty well in that time. She has been running rich since I bought her, changed the plugs and they were very dark. And you can smell how rich she is running in the air if you know what your doing. So get on with your life if you have nothing useful to contribute.
Cheers
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Riding in the sun in Australia on a 04 Worked ZX10R along with a fleet of other crazy toys

[wilz1234]

It interesting that it would be running reach even with the jets slightly clogged. Be sure not to lean it out too far as that's much less engine friendly.

Any update on whether it's running good yet?
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RS50 - ZXR400 - ZXR 400 - ZX7R - Bandit 600 - NTV 650

[MaybeGuy]

[cb1rocket]

I agree with Matt. Pilot adjustment only does idle engine speed which is less than 1/4 throttle opening.

Sorry
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[Pete.]

[MaybeGuy]