Alright people. Happened a few times now although still sporadic. Not always same conditions either. Been to thing along and then thought might put my wrist down here. Gone to accelerate, started to accelerate speed climbing and then at high speed/high revs (not sure exact revs/speed) the bike lunges nose down as if it has a momentary cut in fuel/power? The front of the bike dives and it lurches I roll of the throttle and then feather it back on and all is ok. I thought it was the clutch slipping or losing grip but clutch is fine in all other aspects. It has only happened a few times and they aren't exactly in the same conditions so I'm thinking something electrical? Could the cam chain tensioner affect anything? The bike starts runs and revs gorgeous so no misfires or stalling etc. Could the new exhaust be affecting the fuelling that much at high speed at certain times. I'm at a loss people so any little tips to check first would be a great help. 03 zx6r b1h.
Hitting the rev limiter.
sounds like dodgy electrics to me! Don't know what the answer is though. Mine used to do similar and play up at its worse with a flat or flatish battery, maybe get it healthchecked?
I suffered from a sudden abrupt loss of power/drive in late 2007.
Put it down to getting married.
B'doom tish.
I'm here all week.
What sort of rpm are we talking here?
My mille R did exactly as you describe when hitting the rev limiter at about 11k rpm swiftly followed by a tank in the knackers for being mechanically unsympathetic. Set my shift light to 10k to give me time to see it and shift up.
Being an inline four rather than a twin I expect you limit will be higher 15k rpm rings a bell but I'm not sure.
Hit the rev limiter and the engine will cut. I've only ever done it a couple of times, but it is far better than bouncing the valves
Quote from: tucola on May 22, 2014, 03:29:03 PM
I suffered from a sudden abrupt loss of power/drive in late 2007.
Put it down to getting married.
B'doom tish.
I'm here all week.
How's the veal?
No its not the Rev limiter mine is set lower anyway from before I bought it. Battery is virtually brand new and no problems there. I am inclined to think electrical but not sure which route. Would a slight misfire at a certain revs cause it to lunge fiercely as if someone slammed your brakes on? At a guess I would say it's around 9-11k on the revs. When you say hitting the Rev limiter will cause either to cut ash do you mean a engine cut meaning a restart or a momentary cut in fuel air etc?
I'd suspect a faulty coil breaking down under load.
likely hood is its electrical but it could be several things id say its the coil
Local garage said it might be an intermittent coil problem. I will hopefully have the fairings off this weekend doing a coolant change so will have a gander. Is there an obvious sign that a coil is damaged or faulty?
fuel pump struggling on full demand.
I don't think so as I give it the beans most days on the way to work and it doesn't show signs then in any gear or high speed. Just the odd time this problem has reared it's face so fuel delivery I would say is ok.
Possibly light cracks...most likely nothing will be evident...it's happening under full load so will not show up...only sure thing is to replace the four.
i doubt its a coil pack, coil packs tend to play up regularly once the cock up. almost never are they an intermittent fault.
Hmmm that just raises the bar a bit now. If it were clutch I would expect it to do it every time or most of the time I give it some beans, so that aside I don't know what to look for. Chain and sprockets seem to be healthy.
Clutch...fuelling...spark...Big Gav is a mechanic and has loads of knowledge...all I can do is reiterate that what you describe happened to me and it turned out to be a coil pack on No 3 cylinder...junction between coil and HT lead had broken down(Garage speak).
Would the fuel pump play up in all gears under heavy load? Will try and get more info today on the way to work?
Quote from: Evil636 on May 23, 2014, 08:22:20 AM
Would the fuel pump play up in all gears under heavy load? Will try and get more info today on the way to work?
more than likely yes
I had an iffy fuel pump on my zx10r that only faultered on hard acceleration in 4th 5th and 6th
Iirc mc101 had a similar prob on his 10r
had something similar on the B1 at donny.
removed the fuel pump and cleaned the filter in the bottom, and replaced the spark plugs. all sorted afterwards and pulled like a train....
Cheers guys. All things that I can sort relatively easy on my own. Think I will do them all lol. Thank you
Quote from: Evil636 on May 23, 2014, 11:28:08 AM
Cheers guys. All things that I can sort relatively easy on my own. Think I will do them all lol. Thank you
best bet don't wanna throw money at someone to do it if you can work it out your self
I had similar symptoms and it turned out to be the sidestand switch, it had worn out along the printed circuit.
could be sidestand but I doubt it
Well I did the coolant at the weekend and cleaned the rad. While doing that took the coils off and one is definitely rusting along the sleeve and has seen better days another isn't perfect so got two coming by the end of the week and will swap the plugs at the same time then should be ok.
Quote from: Evil636 on May 27, 2014, 10:03:32 PM
Well I did the coolant at the weekend and cleaned the rad. While doing that took the coils off and one is definitely rusting along the sleeve and has seen better days another isn't perfect so got two coming by the end of the week and will swap the plugs at the same time then should be ok.
are the plugs soiled?
also how old are they?
wouldn't change them if there not that old just clean them up
let us know if it is the coils if its not im stumped
Have you got an alarm/immobiliser on the bike
I had a problem on my sp1 where the bike would be going fine and then splutter and surge, turned out to be the immobiliser contacts cutting the engine, disconnected it and all is fine
Rob
It has got an alarm chap. Never had an issue with the alarm so would not have a clue where to start looking on that regards.
Update though, replaced coils, cleaned air filter. Checked all connectors under air box etc spark plugs are clean and fine. Problem still there. Between 9 and 10k revs under load or when riding along its just frustrating not being every time I'm out on it. A fellow rider said it's only been happening since I got my new can and he reckons it's the fuelling. Could this be right? Anyone who has ever had fuelling issues due to an exhaust on an injected bike recognise the symptoms? Otherwise be looking at power commander to remedy this or try a dyno diagnostic.
I know you said can but is it just the can or a full system and if so what I it if you have like an inch long stubby it might nit like it very much....
You could say it's short fella lol. Has anyone changed a fuel pump filter/fuel pump on a b1 and let me know if it's a hard job or not?(http://i1061.photobucket.com/albums/t475/evilzx6r/B1H/20140422_144701.jpg)[/URL]
If its a full system the fueling would be off but it would just run like shit
Did the 636 have a recall for the regulator/rectifier?
not that ive heard?
Spoke with a local Kwak dealer and they have said after fitting these exhausts before they have needed a power commander because with running a k&n aswell I will be very lean and a flat spot will show which it has so now after a pc3 if anyone has one .
check ebay