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post #1 of 16 Old 05-19-2018, 10:52 AM Thread Starter
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question for tuners out there

I have a problem that's wrecking my head zx12r 2001 a2h ....part throttle im getting low afrs sometimes dropping to 10 ...problem is there without pc5 and autotune connected ,but I can see what is happening when im all connected ,,,bike fuels blob on squeezing throttle but cruising it starts to stumble intermittently ,no f1 light on btw ..tps is set to 1.086 v and calibrated on pv5 software ,voltage trace is smooth and constant when held at throttle openings ...fuel injectors are flowing to 330cc which is in spec,no vacuum leaks and pair valve blanked .acceleration is blob on and smooth no issue its just when im cruising its like the ecu just throws fuel at engine .but if I open throttle its ok
any ideas chaps
ps tried to get fault codes from ecu but led just constantly flashes

Last edited by alfadave11; 05-19-2018 at 10:54 AM.
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post #2 of 16 Old 05-19-2018, 01:41 PM
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Hi Alfadave11 I know you said no vacuum leaks but thats what it sounds like good luck Craig

if anything goes wrong check the battery
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post #3 of 16 Old 05-20-2018, 08:12 AM Thread Starter
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Hi Alfadave11 I know you said no vacuum leaks but thats what it sounds like good luck Craig
definitely no vacuum leaks as ive reconfigured vac pipes when I slipped out throttle bodies to get check injectors spray pattern and flow rates .
issue seems to be cruising at most speeds and sounds misfirey as in over fueling open throttle it clears ..looks like ill have to get steve at motrac racing to look at it .I haven't got fuel pressure kit to check that ie fuel pressure regulator
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post #4 of 16 Old 05-20-2018, 12:23 PM
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with your TPS did you check the resistance with it disconnected to make sure its ok Craig

if anything goes wrong check the battery
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post #5 of 16 Old 05-20-2018, 01:21 PM Thread Starter
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with your TPS did you check the resistance with it disconnected to make sure its ok Craig
as stated in my first post voltage is smooth and stays constant if held with no fluctuations ,on the fly when data logging tps stays at constant to throttle input ,and can also see this on display
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post #6 of 16 Old 05-20-2018, 07:55 PM
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so tune it... pull fuel out in that tps and rpm area
is the fpr connected to vac?
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01 ZX-12R 8.84 @ 156.3 on dot tires, NA.... turbo 8.47 @ 164
00 ZX-12R 8.62 @ 165.2 no bars, slicks, 55 shot... turbo 8.32 @ 173
00 ZX-12R 1: 222.046 1.5: 226.390 Worlds Fastest NA Kawasaki
00 ZX-12R street turbo 1: 227.9 1.5: 234.1
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Worlds fastest ZX-12R CMG Racing RCC Turbos
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post #7 of 16 Old 05-22-2018, 08:20 AM Thread Starter
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so tune it... pull fuel out in that tps and rpm area
is the fpr connected to vac?
yes everything connected ,I think issue is breather related as I pulled blanking plates and a seal was dislodged so used reed valve blocks and blanked off hoses and fueling is better but something is not right ,
im going to check pressure regulator to see if it richens up when clamped off and disconnected.
issue seems to be on steady throttle regardless of rpm ,you can feel bike stumbling and afr stays constant and sometimes it richens ..its hard to diagnose on the road so im taking it to steve at motrac racing and get it on his dyno
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post #8 of 16 Old 05-22-2018, 05:47 PM
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fault codes are read by long and short flashes, not actual numbers displayed.

01 ZX-12R 8.84 @ 156.3 on dot tires, NA.... turbo 8.47 @ 164
00 ZX-12R 8.62 @ 165.2 no bars, slicks, 55 shot... turbo 8.32 @ 173
00 ZX-12R 1: 222.046 1.5: 226.390 Worlds Fastest NA Kawasaki
00 ZX-12R street turbo 1: 227.9 1.5: 234.1
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Worlds fastest ZX-12R CMG Racing RCC Turbos
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post #9 of 16 Old 05-23-2018, 08:20 AM Thread Starter
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fault codes are read by long and short flashes, not actual numbers displayed.
mine continuously flashes when in diagnostic mode ,but if I disconnect a plug to instigate a fault I get the code relating to it ,strange that it constantly flashes ...
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post #10 of 16 Old 05-23-2018, 02:30 PM
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Might need a TB sync ...

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post #11 of 16 Old 05-24-2018, 11:53 AM Thread Starter
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Might need a TB sync ...
tb sync is spot on and doesn't affect fueling if slightly out ,only affects response and tickover
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post #12 of 16 Old 06-03-2018, 09:52 AM Thread Starter
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well ive double checked everything ive done and went back to basics ....
DOH !!! checked charging system and bike struggled to show 13.2 volts so checked connectors and block connector from stator was half melted ..stripped that back and crimped connections and still same ,get revs up with headlights on and voltage drops so new reg /rectifier is ordered....
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post #13 of 16 Old 06-03-2018, 02:41 PM
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Originally Posted by alfadave11 View Post
well ive double checked everything ive done and went back to basics ....
DOH !!! checked charging system and bike struggled to show 13.2 volts so checked connectors and block connector from stator was half melted ..stripped that back and crimped connections and still same ,get revs up with headlights on and voltage drops so new reg /rectifier is ordered....

You're saying the charging system is causing your bike to stumble intermittently? I have 13.2 volts at best daily now coming up on 31k miles. I just did 500 miles last week, 300+ yesterday. I cannot imagine replacing the r/r now when there's nothing wrong with it. How does stuff just go dead I mean seriously. I ride in altitudes up past 10k feet, i just rode around pikes peak yesterday, through heavy metro traffic and blow your head gasket hot heat, cold freezing winters, rain, I don't have any of these issues. I even run a full ti exhaust no fuel controller. Am I not trying hard enough, LOL.
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post #14 of 16 Old 06-03-2018, 03:37 PM Thread Starter
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You're saying the charging system is causing your bike to stumble intermittently? I have 13.2 volts at best daily now coming up on 31k miles. I just did 500 miles last week, 300+ yesterday. I cannot imagine replacing the r/r now when there's nothing wrong with it. How does stuff just go dead I mean seriously. I ride in altitudes up past 10k feet, i just rode around pikes peak yesterday, through heavy metro traffic and blow your head gasket hot heat, cold freezing winters, rain, I don't have any of these issues. I even run a full ti exhaust no fuel controller. Am I not trying hard enough, LOL.
the issue was progressively getting worse ,don't forget that im running pcv and autotune(heated wideband sensor)..the ecu requires a healthy charging system as well as battery ,in all conditions and loads ,having headlight on just drained voltage out of the system(12.3v at 4k rpm) this in turn can cause all sorts of issues and can confuse the ecu into issues that ive had ,mainly dumping fuel in ,this is what ecu does to safeguard engine ..I know that a failing battery can cause all sorts of issues in cars and motorcycles and throw all sorts of codes in can bus systems ..modern fuel injected vehicles need a decent charging system
when I ride bike just opening throttle going through gears as normal the ecu just enrichens by throwing fuel into engine and you don't really notice, but when your on light loads and cruising the ecu cant cope by giving correct fuel rate ,sounds like its 2 stroking in a better description from the exhaust noise
im further checking stator tomorrow but im sure that will be in spec from initial resistance checks ive done
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post #15 of 16 Old 06-03-2018, 03:45 PM
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Originally Posted by alfadave11 View Post
the issue was progressively getting worse ,don't forget that im running pcv and autotune(heated wideband sensor)..the ecu requires a healthy charging system as well as battery ,in all conditions and loads ,having headlight on just drained voltage out of the system(12.3v at 4k rpm) this in turn can cause all sorts of issues and can confuse the ecu into issues that ive had ,mainly dumping fuel in ,this is what ecu does to safeguard engine ..I know that a failing battery can cause all sorts of issues in cars and motorcycles and throw all sorts of codes in can bus systems ..modern fuel injected vehicles need a decent charging system
when I ride bike just opening throttle going through gears as normal the ecu just enrichens by throwing fuel into engine and you don't really notice, but when your on light loads and cruising the ecu cant cope by giving correct fuel rate ,sounds like its 2 stroking in a better description from the exhaust noise
im further checking stator tomorrow but im sure that will be in spec from initial resistance checks ive done
Best wishes that it'll get sorted soon and no doubt it will. Cheers.
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