Calling all mechanically minded

poted this on a Ninja forum as well but the org mechanics might be able to offer some sugestions to it as well. IL4 question as well

there is def something up with the power or power delivery on my bike (P7F).

sometimes it will shoot off after 9k and keep pulling like a train, other times it will do that in fits and starts across the revrange, but most of the time it just feels like its got a lot more to give and its muted or strangled.

today i was doing well above a ton wont say where but was in 3rd so it was in its power band above 12K . anyhow open the throttle and not a lot takes ages to accelerate anywhere aproaching quick. most the time i am lucky if i can get it past 130!! it just seems to not want to do anything fast. like maybe 1MPh a second in the power band in 3rd, same in 4th. up to about 110 its quick but not pull your arms off quick, unless its in one of its moods to do so. I know it can accelerate rapidly as when it feels like it sometimes there is a massive surge of power and bang there we go, change gear and its back to feeling like it has more to give. the rev needle takes ages to move at full throttle above about 12.5K in 3rd and above!!!

I thought it could be the valve in the exhaust sticking??? i am gettin an after market pipe fitted soon so ill see if that helps.

I thoght maybe a problem with the FI or ECU? somethiing not operating properly.

also concidered it could be a US import, although it was bought from george whites and they deal in UK bikes. As i know the US ECU is down on power and stangles the bike after about 13K

Guys i am getting frustrated with my pile of crap now as its ****ing anoying having brief teasers of power and then pack to feeling like its trying but being restrained.

Any ideas (sensible ones) as i am geting really ****ed off with it now.

I am desperate enough to pay for a dyno and if its under powered throw it through the door at GW and get it seen to under warranty. but first i though i would ask if anyone might know what could be causing it??

Hi neio,

Definitely worth getting a dyno done and finding a dyno to use as reference from a mag or someone here so you can compare. A mag is bound to have done one. will look for you.

Then take it to george whites, or you could call kawakaski, or even pop to kawasaki bristol. They're very helpful compared to gw. GW were a nightware when i bought my bike. was sat there an hour and a half cos the guy didn't know what he was doing and couldn't find any paperwork. Several complaints later to the managers and i managed to get my ownerbook and service log book etc, 2 months later. Won't be buying from them again. (That's my gw rant over)!

Originally Posted by adw

Hi neio,

Definitely worth getting a dyno done and finding a dyno to use as reference from a mag or someone here so you can compare. A mag is bound to have done one. will look for you.

Then take it to george whites, or you could call kawakaski, or even pop to kawasaki bristol. They're very helpful compared to gw. GW were a nightware when i bought my bike. was sat there an hour and a half cos the guy didn't know what he was doing and couldn't find any paperwork. Several complaints later to the managers and i managed to get my ownerbook and service log book etc, 2 months later. Won't be buying from them again. (That's my gw rant over)!

I have it booked in for a Dyno run tomorrow morning. I phoned them up and told them I want it to see if the engine is running properly. If that shows up bad air fuel mixture or any problems on the power curve at least I have some proof to go to GW with and back up my claim. I have the Fast bikes mag long term ZX6R as a bench mark and can realistically expect to see about 105-109BHP at the rear wheel as standard.

I will be lifting the tank tonight to check for any kinked blocked or lose tubes and breathers as well.

Its annoying when you know something is not right with your pride and joy but cant tell exactly what

Sounds like a valve in the exhaust or inlet tract not opening properly does your bike have one of these? not to familiar with your bike.

Originally Posted by mototech

Sounds like a valve in the exhaust or inlet tract not opening properly does your bike have one of these? not to familiar with your bike.

It def has an exhaust power valve yes its located under the seat and you can see it clearly. On priming the cables activate and move it. But that wont 100% prove its opening all the way once running will it. It also has two sensors of some kind on the collector box where all the down pipes meet; I assume they are Lamba sensors though?

As for on the inlet/air intake, I can only really take the tank off to check nothing is blocked or the Ram air isn’t blocked etc.

Like I say I am hoping the Dyno print out will highlight any issues with air/fuel and power?

I bet you a shiny penny it is a spark plug breaking down/problem

Had exactly the same symptom on my SV ... it was a dodgy plug ... sometimes it'd rev fine, other times it just felt like it wasn't pulling as hard as it should ... but not as if it was totally down onto just one ...

If you think about it if one (or more) cylinder is under performing, not only is that not giving much power out, but the others are then fighting it staking the power away from them ...

As you have identified, it could be something more s3xy like the power valve or valves themselves, but I'd go for the plugs first

Originally Posted by neio79

It def has an exhaust power valve yes its located under the seat and you can see it clearly. On priming the cables activate and move it. But that wont 100% prove its opening all the way once running will it. It also has two sensors of some kind on the collector box where all the down pipes meet; I assume they are Lamba sensors though?

As for on the inlet/air intake, I can only really take the tank off to check nothing is blocked or the Ram air isn’t blocked etc.

Like I say I am hoping the Dyno print out will highlight any issues with air/fuel and power?

Yep they sound like the lambda sensors, definately sounds like something not opening right and causing a restriction occasinaly as this would give you the symptoms you describe... a dyno run will give you some answers im sure.

Originally Posted by mototech

Yep they sound like the lambda sensors, definately sounds like something not opening right and causing a restriction occasinaly as this would give you the symptoms you describe... a dyno run will give you some answers im sure.

Maybe a blocked air intake etc? or a trapped breather tube of somesorts?

Originally Posted by neio79

Maybe a blocked air intake etc? or a trapped breather tube of somesorts?

Well yeah but i thought you just said you had checked the intake? trapped breather is unlikely. my moneys on the exhaust valve.

[yorkie_chris]

Lambda sensors have the potential to muck up the fuelling, as do the spark plugs as blue says, as does a sticky EXUP valve. (wouldn't expect carbon deposits on such a new machine though)

Basically it's a complicated EFI system, if it's showing no fault code then there's no real way to know whats fubarred, also your dyno run could show up perfectly healthy as you've got an intermittent problem

Have a check over for loose connectors and stuff, that's a distinct possibility too.