Date: 29-03-24  Time: 11:10 am

Author Topic: FZS1000 dying at 6500 revs  (Read 2568 times)

BJohnD

  • Cager in Training
  • Posts: 19
    • Main bike:
      FZS 1000 Gen1
    • View Profile
FZS1000 dying at 6500 revs
« on: 02 September 2017, 08:42:37 pm »
Hi, I just bought a FZS1000, it pulls fine until it reaches ~6500 rpm and then it feels like it's hit a rev limiter.

I suspected the exup, but that is all free & I can turn it easily to the stop and the servo resets it when the ignition is switched on. Is there a way to test the servo? I'm not getting a fault code and I suspect it is something else.

Are there any known faults that might cause this?

PieEater

  • GP Hero
  • ******
  • Posts: 1,359
  • Thank You Melton Mowbray, Yamaha & Ivan
    • Main bike:
      FZS 1000 Gen1
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #1 on: 02 September 2017, 09:31:19 pm »
It's about that spot in the rev range where it starts needing more air so make sure there isn't anything blocking the air intake under the seat / tank, if not then check the air filter to make sure it isn't clogged up or a rag hasn't got sucked through the snorkel.
« Last Edit: 02 September 2017, 09:32:33 pm by PieEater »

John_FJ

  • DAS Born Again
  • **
  • Posts: 50
    • Main bike:
      FZS 1000 Gen1
    • - FJ1200
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #2 on: 03 September 2017, 10:18:42 am »
Has it been restricted? I had a similar problem with an old FJ12, would rev to the redline when not in gear, once you were riding it would die at about 5k.
Derestricted it and it went great.
"Scattered showers my arse"........ Noah

Falcon 269

  • GP Hero
  • ******
  • Posts: 5,897
    • Main bike:
      FZS 1000 Gen1
    • - Yamaha R1 1999
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #3 on: 03 September 2017, 01:48:37 pm »
Restricted Fazers (French imports) will rev out above 6k rpm.  Most were derestricted on import to the UK, although I did come across one only recently.

I will take a money bet that PieEater has nailed the problem here. :)

BJohnD

  • Cager in Training
  • Posts: 19
    • Main bike:
      FZS 1000 Gen1
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #4 on: 04 September 2017, 02:58:58 pm »
well, I had a look, there was a small bundle of cable over the inlet and I "KNEW" that wouldn't do it, after all, I was factory trained by Yamaha (bear with me, it was 25 years before this bike was built....), tidied that out of the way and pulled the filter which seemed OK, just a couple of bits of debris. Checked the exup again, made sure the servo was free. But I "KNEW" I hadn't achieved anything.

Couldn't test it Saturday, read your comments and scoffed, almost took the bet......just ran it up the road......s#1t, it accelerates when it hits 7k, almost fell off the bloody thing with surprise......thought I'd bought a motorbike, not a ballistic missile....

Thanks guys, I doff my hat to your superior knowledge on this machine.

It's a bit lumpy at low revs, but I guess a new filter, plugs and carb balance should sort that, maybe remove the AIS so I can get in there....

Falcon 269

  • GP Hero
  • ******
  • Posts: 5,897
    • Main bike:
      FZS 1000 Gen1
    • - Yamaha R1 1999
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #5 on: 04 September 2017, 04:37:02 pm »
Many have ridden that way before you ... ;)

Yup, do the basic servicing things first and then decide whether there's anything else needing attention.

One thing you could do while you have the plug leads out is unscrew the caps, trim 1cm off the lead and refit.  I'm sure you know why. :)

PieEater

  • GP Hero
  • ******
  • Posts: 1,359
  • Thank You Melton Mowbray, Yamaha & Ivan
    • Main bike:
      FZS 1000 Gen1
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #6 on: 04 September 2017, 09:12:30 pm »
Glad you got it sorted, bizarrely enough pretty much my first post on here was about the exact same issue. When I first got my GEN1 I asked the dealer to fit an Optimate lead and they left the instruction tag on it which was right near the intake snorkle, Mike (Falcon 269) identified the issue for me straight away.

Just for info, the EXUP valve starts to open around 2000rpm and is fully open around 6000rpm which is why your problem was unlikely to be EXUP related.

Kenbob

  • Weekend Warrior
  • ***
  • Posts: 214
    • Main bike:
      FZS 1000 Gen1
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #7 on: 05 September 2017, 12:22:58 pm »
Hi mike, in my ignorance can I ask why you trim 1cm off of the leads.

Falcon 269

  • GP Hero
  • ******
  • Posts: 5,897
    • Main bike:
      FZS 1000 Gen1
    • - Yamaha R1 1999
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #8 on: 05 September 2017, 01:24:08 pm »
Because over time the copper core in the lead starts to fracture where the screw in the cap goes into it.  This can cause a weak or intermittent spark.  Often slight misfires or hesitations get attributed to fuelling issues when in fact it's an ignition fault and the plug cap/lead connection is a known weak spot.

BJohnD

  • Cager in Training
  • Posts: 19
    • Main bike:
      FZS 1000 Gen1
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #9 on: 05 September 2017, 02:39:14 pm »
That's a good point Mike, I'll do that while I'm in there. Looked at getting a plug out the other day, looked a PITA so I'll not want to do that too often.

Hopefully the basics will smooth it out,  always concerned with a new buy if fixing bits will send the cost spiralling.

Falcon 269

  • GP Hero
  • ******
  • Posts: 5,897
    • Main bike:
      FZS 1000 Gen1
    • - Yamaha R1 1999
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #10 on: 05 September 2017, 05:17:19 pm »
I'm sure with your experience of bikes you have a feel for what's a good 'un and what's not.  Plugs are a fiddle but once you've done it a couple of times, it becomes a bit easier.  My problem is I only have to do it every couple of years and by then I've forgotten the best way to get in there.  :'( :lol

John_FJ

  • DAS Born Again
  • **
  • Posts: 50
    • Main bike:
      FZS 1000 Gen1
    • - FJ1200
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #11 on: 06 September 2017, 06:04:19 pm »
Not done the plugs on mine yet, I had a Triumph triple thats was a balls ache to change them, I used a small piece of hose to get them started.
"Scattered showers my arse"........ Noah

jamorro

  • Cager in Training
  • Posts: 7
    • Main bike:
      FZS 1000 Gen1
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #12 on: 09 September 2017, 09:05:39 am »
I had this problem on ride round the Pyrenees and went to a French mechanic. He prodded and poked around, scratched his head and then pulled out one of my cargo nets scrunched up under my seat. It was blocking the air intake. I think he called me some sort of idiot, but I don't speak French. Learnt my lesson. Don't jam as much as poss under the seat!

ptolemyx

  • DAS Born Again
  • **
  • Posts: 80
    • Main bike:
      Other
    • - Busa
    • View Profile
Re: FZS1000 dying at 6500 revs
« Reply #13 on: 11 September 2017, 10:34:12 am »
Glad I just read this before tearing mine apart. Hooning about (on our private road) yesterday accelerated fine up to 140 then died like the ignition had been switched off, was thinking fuel starvation but I'll now look at the air intake  8)
when in doubt go flat out