Kawasaki ZX Triple

[AndyMX5]

So my ZX7R ZX5.61R is now a triple!

My bike is trying to kill me... Went to pull out in front of some traffic (Enough room and all that) but the bike didn't accelerate - just made a lovely triple noise... So I wound on more throttle and was slowly moving out of trouble and then the fourth cylinder decided to kick in.... I did my first 7R wheelie and very nearly ploughed into the cars in front!

Later on, whilst leant over on a roundabout, the 4th cylinder decided to kick in again - luckily I had less throttle on this time as I swear it was trying to high side me.

So, I've invented a new bike the zx561r triple... not sure if it'll catch on though!

[y2blade]

sounds interesting give it a try in the wet

[rumpelstiltskin]

Try sitting on a big V-Twin and have engine cutting out/missing issues.Had an SP1 and someone hadn't strapped in the ECU right in place and it was loose,it missed on acceleration,it was like pulling on the front anchors as hard as you could,while accelerating,when it missed a beat,scarey stuff!!

[AndyMX5]

Well, we're due another rain storm later for my ride home from work....

Wish me luck!

[FourWheelDrift]

Sounds more like you've got a laggy turbo there.

No idea how they work but can you pull out a plug or something to force the troublesome 4th cylinder to not work at all so that you can at least ride home tonight and get it fixed later?

[black-k1]

I had a BMW K100RS that I was riding with a pillion to work in Cambridge one morning when I came up behind a line of crawling pace traffic. I pulled out to pass the traffic when the bike decided to run on to 2 cylinders. As I already had about a 10 to 15mph speed advantage over the traffic and the visibility was good with nothing coming the other way and the bike was maintaining it’s current speed on 2 cylinders I decided to carry on with the manoeuvre rather than have to push back into the line of traffic. Naturally, I wound the throttle on to ensure that the current speed was maintained. Just as the throttle hit the stop the other two cylinders kicked in and I was launched into a full height, third gear, two up wheelie past the whole line of traffic. Luckily I managed to slowly get the front wheel back to the tarmac and to this day I’m not sure if the pillion was mega impressed or sh1t scared. I know I was the second!!!

[Conian]

Any idea on whats causing it?

It was a similar misfire that contribute to my zx7r 15mph highside!

I once had a real mystery on my hands with my 7r cutting out on occasion, it would run fine, but when i slowed down in towns n villages, it would misfire like mad, drop onto 3 cyls etc, and would continue to do so even if i revved it n stuff, but when it farted it's way back up to speed on an open road it would clear and run fine. It was like the opposite of carb icing.

I did the same route goin to work each day and was tired of it on the way back in the rain one day, i pulled over under a tree, put it on full choke and hoped that it would dry out a bit and run better. I walked a short distance away phoned a pal to pass the time, after a few mins i heard a massive HISSSSSS, turned arund and couldnt see my bike through the steam.

It had over heared and fecked up the thermostat housing gasket.

While fixing it, i investigated as to why the fan hadnt cut in... and found the fan wedged in at an angle having come off the motor.

So.. when the bike was going slower and the fan wanted to spin (they come a lot on 7r's) it was drawing more n more current trying to spin the jammed fan, this then starved the sparkies of full power n made the bike stutter.

[AndyMX5]

I took it out for a spin at lunch time and it was running fine for the most part. Once or twice went down to 3cylinders - normally when I'd let the rev's drop down to around 2000 rpm.

I think it'll be alright to ride home like this, I'll just take it easy.

When on 3 cylinders - when you let off the throttle, you get an awesome popping/burbling from the exhaust as all the unburnt fuel is pumped out of the lame cylinder into the hot exhaust!


Another thing I noticed though, when it was running "properly" it still wouldn't rev passed 10k rpm.
It was like it was hitting a rev limiter, but it was a good 2k less than the limiter.

[anonymous-user]

AndyMX5 said:

Another thing I noticed though, when it was running "properly" it still wouldn't rev passed 10k rpm.
It was like it was hitting a rev limiter, but it was a good 2k less than the limiter.

Could be dirt in one of the jets?

whip the carbs off and try a blast of compressed air through the jets.

[Conian]

Usual old question... when was it last serviced?
Do the carbs need balancing?
Changing the sparkies might help, maybe the spark-leads are fecked?

Did ya buy it privately?

[AndyMX5]

Conian said:

Usual old question... when was it last serviced?
Do the carbs need balancing?
Changing the sparkies might help, maybe the spark-leads are fecked?

Did ya buy it privately?

Yep, paid £1200 for it so expectd a few issues

Last serviced about 4000 km a go, but I'll need to double check what was actually done.

I've been looking at the End can and I think it might be a complete Akky system rather than just the can so it's probably covered about 30,000km on the wrong jettings...

I'll have a good tinker on the weekend and check the state of everything.

[y2blade]

good luck mate...sounds like ignition coil breaking down!

http://inpcars.com/controls/296.html

http://cgi.ebay.co.uk/Kawasaki-Ninja-ZX7-ZX7R-Igni...

or plug/cap/lead damaged...sounds more ignition than carburation BUT without bieng hands on its very difficult to diagnose it!!!

let me know how you get on please!

Edited by y2blade on Wednesday 25th July 17:27

[black-k1]

y2blade said:

or plug/cap/lead damaged...sounds more ignition than carburation BUT without bieng hands on its very difficult to diagnose it!!!

My money would also be on sparks rather than fuel.

[Conian]

I'm still thinking electrical,, but it was found that it was best to leave 7r's on standard jets even with a full Akky as jetting them was very hard, easy to add on lots of power, but hard to keep them ridable with decent carburation at low revs.

Mine had a full Akky system on, K&N filter. Uprated Tokicos, braided hoses and wavey disks. Lovely.

[AndyMX5]

Hi Guys...

It always seems to run on 4 cylinders now but feels massively down on power.

Since I bought it, there has always been a massive hole in the power at 6200-6800 rpm but I've just ridden round it in the past. Eg, If cruising, change at 6000rpm and just use the torque - if going for it make sure I keep it above 7000pm.

Anyway, I'll try to get time to work on the bike this weekend and I'll check your suggestions whilst I'm at it!

[y2blade]

AndyMX5 said:

Hi Guys...

It always seems to run on 4 cylinders now but feels massively down on power.

Since I bought it, there has always been a massive hole in the power at 6200-6800 rpm but I've just ridden round it in the past. Eg, If cruising, change at 6000rpm and just use the torque - if going for it make sure I keep it above 7000pm.

Anyway, I'll try to get time to work on the bike this weekend and I'll check your suggestions whilst I'm at it!

exactly how long have you been riding it like this?

[AndyMX5]

With the gap in the power at 6000? 28 days - perhaps it was bitten by a rage infected monkey?

I didn't notice at first as I was riding it on the torque for the first week or so (due to a 75 mph highside last time I rode a bike - I'm a little timid still)