flatspotting 03 ZX6R....why??

varden · Post by **varden** » Mon Jun 19, 2006 9:14 am

Yup...trackie has a flat spot over 9000 rpm.

All vacume lines are in place, no air box leaks....

Ideas?

FrogZ · Post by **FrogZ** » Mon Jun 19, 2006 11:00 am

...get a 12

javaman · Post by **javaman** » Mon Jun 19, 2006 11:10 am

What about KTRIC ? What's this for ?

FrogZ · Post by **FrogZ** » Mon Jun 19, 2006 12:02 pm

I had a RX10 used to die at high speed.
Took a long time to find as the mechanice would not take it and run it at 200 to find out why it was doing it

...anyway ended up being that the fuel tap (not hose) did not have a big enough hole

We stuck a drill up it and the bike never missed again.

So what I am saying Varden is (buy a 12

) it can only be fuel, air or spark eh?
Not liable to be CDI, not liable to be air either.....
fuel line kink ?

What have you done to it since it last worked right ????

Rossi · Post by **Rossi** » Mon Jun 19, 2006 12:47 pm

definitely sounds like fuel starvation.....if it's after a lengthy run mate I'd first check the breather on the fuel filler cap aint blocked

varden · Post by **varden** » Tue Jun 20, 2006 12:24 am

well it was going fine until lisa did a 150m tankslapper on it.

I talked to barrabob yesterday, he says its prolly clogged injector so i will bung in some injector cleaner and try that.

it needs a service so either way it will prolly wind up at mechanics sooner rather than later.

Neka79 · Post by **Neka79** » Tue Jun 20, 2006 12:53 am

varden wrote:well it was going fine until lisa did a 150m tankslapper on it.

I talked to barrabob yesterday, he says its prolly clogged injector so i will bung in some injector cleaner and try that.

it needs a service so either way it will prolly wind up at mechanics sooner rather than later.

check the fuel , air and electrical..cos that what makes a motor go bang...

hope that helps

Barrabob · Post by **Barrabob** » Tue Jun 20, 2006 7:52 am

The engine had been sitting for a length of time and my 2 cents worth was a bit of jelly petrol dislodged itself and clogged something.

injector cleaner is worth a go but you really want the flatspot gone before the next trackday rather than treating the fuel and hoping it comes good.

I still think its worth giving the injetor cleaner a go and letting it soak a bit though.

varden · Post by **varden** » Tue Jun 20, 2006 2:08 pm

I just called my mechanic, I'm taking the bike down to him in the morning and he can sort it out.

I've put some injector cleaner thru it but there is a limit to how much blowing out i can do without riding it down the road on slicks with no rego.

I'll get the valve clearances done and the balancing of the throttle bodies too.

Then i might feel compelled to start modding it.....mmmmm PCIII and BMC filter....fuel mapping...etc etc.......

FrogZ · Post by **FrogZ** » Tue Jun 20, 2006 2:15 pm

Cmon Varden you know the ONLY solution mate.... I'm getting sick of telling ya'......

blackninja · Post by **blackninja** » Tue Jun 20, 2006 8:01 pm

frogzx12r wrote:Cmon Varden you know the ONLY solution mate.... I'm getting sick of telling ya'......

if you add-up vardens 636 collection it should = over 1200cc

blackninja · Post by **blackninja** » Tue Jun 20, 2006 8:41 pm

im glad it kicked some arse their for a while

i guess the engine is overdue for a good service did ya check the spark plugs they would be abit shitty after sittn around could be they are burning out

Strika · Post by **Strika** » Tue Jun 20, 2006 9:30 pm

Can't see that injector cleaner will hurt it, but can't also see how it could be a blocked injector if it only fluffs at 9k!!!! More likely the fuel starvation issue, or something has come adrift inside the throttle bodies!

SocialSecurity · Post by **SocialSecurity** » Tue Jun 20, 2006 10:25 pm

what condition is the air filter in?

varden · Post by **varden** » Tue Jun 20, 2006 10:37 pm

frogzx12r wrote: Cmon Varden you know the ONLY solution mate.... I'm getting sick of telling ya'......

Let me guess??

ZX12R track bike??

Nah too cumbersome

blackninja wrote: if you add-up vardens 636 collection it should = over 1200cc

hmmm....with a custom crank i could have a 1272cc V8 ZX6R

Strika wrote: Can't see that injector cleaner will hurt it, but can't also see how it could be a blocked injector if it only fluffs at 9k!!!! More likely the fuel starvation issue, or something has come adrift inside the throttle bodies!

Well its also stalling, rough idling as well as flatspotting. If you gas it it clears its throat for a bit in the revs then by 9000 rpm it pulls the pin.

Truth be told i haven't looked at the plugs or the airfilter (cept to put it in airbox), but a service will be the go.