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Mid/high rpm stumble. Description within

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24K views 49 replies 9 participants last post by  ariel607  
#1 ·
Actually more than a stumble....more like falling flat on it's face. Like it's hitting the rev limiter.

While on a ride today, I hit a nice smooth straight section on a country road and decided to do a roll-on second gear wheelie. Pulled great to 7K, but then just quit pulling....like it hit the rev limiter. So tried again. Same result. Slowed down and put it in first....and tried again. Pulled fine all the way to redline with no stumble. Tried again in second....and again in third. Same stumble. If I roll off the throttle and then roll it back on slowly, it'll pull past....but as soon as I whack it open, it stumbles again. Strange that I don't get the same symptom in first. It's always between 6500 and 7000 rpm. What do you guys think? My first thought is a clogged fuel filter (I hope).
 
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#33 ·
new plugs,dielectric grease on the coils grip,also on any related electric plugs ie. coil harness,ground etc. also did by pass the stand switch. did a short test 1,2 gear at 8k rpms.problem not present.will make another test tomorrow on 3,4 gear over 8k rpms. noticed the speedo has a rev light that turns on at 8k rpms. is that normal? can be adjusted? red line is at 11k rpms
 
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#36 ·
was a reading a thread for other site where a technician answer inquiries. he adviced to check the stand switch cause sometimes it drops from vibration causing an intermitent cut tested the bike todaybut no luck.problem still.just like yours.revs up nice in neutral or clutch engaged but cuts off at 8k rpms on running gears. i wonders if there's a relay for rpms redline control on our 1000rr.on the weekend ill be by passing the angle bank sensor. bike suffered a a small crash before the problem started. chances are the sensor could be partially broke
 
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#37 ·
What kind of damage did the bike take ? I've never heard of a bas cutting at a specific rpm range. I believe it's either power or no power if that sensor goes out. But hey, I'm tapped for ideas so if you're in there, why not ? My issue began after I took it to the dealer for the stator recall. After I got it back and I noticed the problem, I double checked all the connections they would've made and it was a few simple plugs. They were tight. I hated letting someone else under my bikes dress, but it's the only way they would warranty it. I found some things that had me irate, but that's a side note.
So we've both changed plugs, checked connections acceptable while in that area, our fuel strainers in the tanks are clean, our grounds are good, no FI light, all grounds are good, air filters are clean,( I also have done the PAIR mod, flapper removal, removed exhaust cables, pc3) also have a new regulator. My side stand switch is good as well. Are we on common ground so far ?
 
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#38 ·
yes. we are common ground but no power commander on my cbr. i think the stator recall has not been made on my bike. am thinking on the relays.the ones at the box on the left side fairing at the front. theres 4 of them. is theres any way to see what circuit or what they do? also the bike suffered low speed on track day. been told after that, symptoms appeared.am thinking on the bank angle sensor.tomorrow will do a by pass on it and try
 
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#39 ·
Dug out the service book for that one..... The relays listed are headlight, fan control, engine stop, and fuel pump. Also got into the self diagnostic port and showed a intake air temp sensor fault. Checked continuity on the sensor and got nothing. The manual says I need between 1 and 4 ohms. I wonder if that might come into play ?
 
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#40 ·
chasinmytail said:
Dug out the service book for that one..... The relays listed are headlight, fan control, engine stop, and fuel pump. Also got into the self diagnostic port and showed a intake air temp sensor fault. Checked continuity on the sensor and got nothing. The manual says I need between 1 and 4 ohms. I wonder if that might come into play ?[/QU the self diagnostic port is the some like yellow one? i did a thread to seek help on our same problem.other member sugested the bike could be on limp mode.dont know what it means so i searched the forum. it seems like once you remove the servomotor on exhaust the bike sets to service(limp mode) mode in order to get a proper air/fuel ratio for the new flowing exhaust changes.
Click to expand...
 
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#43 ·
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#49 ·
well for everyone who advised on this thread am happy to let you know that the issue was caused by a faulty fuel pressure regulator. as told before i already changed the electric fuel pump motor and nothing. then asked a friend to borrow his cbr tank with fuel pump. did swab today and bang!! the cbr goes all the way up to red line again. just like this. i know other member bikes has been thru the same issue. in this case fuel pump pressure regulator.
 
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