The New Kawasaki ZXRR125GP

[k14]

Hey RG, or should I say.... we know who you are.
Powerjet, what does it do?
Powerjet adds extra power to the engine by injecting fuel at a metered rate separately to the other jet circuits in the carburettor. The powerjet is electonically controlled via a solenoid on the side of the carburettor and is thus controlled by the ECU. The PJ allows the tuner to avoid mid-throttle engine seizing by richening the midthrottle mixture. Very few engine seizes occur at full throttle. The engine rpm at which the PJ opens and closes can be set if you have an adjustable ECU otherwise it is set by the factory. Typically the PJ will open at say 8k rpm and close at 10.5 or 11k rpm (or something similar) to allow the engine to overrev. The size of the PJ can be changed just as one changes the other jets., but like most of them other than the main jet, they don't tend to need changing from standard.
Cheers, Steve

On the Rs's (powerjet only on 98 and newer) the power jet is on at all throttle openings below 4000rpm and from 4000 to the controlled rpm is on at above 70% throttle position. The standard cutoff is 12750rpm but you can replace a plug in the wiring loom and change that cutoff to 12500 or 12250.

[Sketchy_Racer]

They would be the modules right?

Mine has the older loom, without the modules. so no difference.

Modules only came into operation in 2001+ AFAIK

[k14]

There is a little plug up by my cdi. I have 3 other plugs in my jet kit which i can swap around to change the cutoff. Waste of time though, I just leave the standard one on the whole time.

[Ivan]

yeah thats the modules.
They are a waste oftime I dont care about power jet carbs. I amused to the old model and can still ride it well its what power band is

[k14]

yeah thats the modules.
They are a waste oftime I dont care about power jet carbs. I amused to the old model and can still ride it well its what power band is

Yes Ivan, of course you know better than HRC. I think you better ring up Mr Honda and tell him, might even give you a job.

[Ivan]

nope didnt say that im saying i dont use a bike with it. Didnt say Honda didnt need it, Glen and you might like it I like my bike as Im used to it and can ride it without it is what im saying. Dont always jump to conclusions and say that I think I know better Im saying what I like and thats my bike.

[Skunk]

They are a waste oftime I dont care about power jet carbs. I amused to the old model and can still ride it well its what power band is

Is that 'amused' or 'am used'? Have you run out of spaces as well as full stops and commas? I might have a spare 'shift' key too. You appear to be missing both.

[k14]

nope didnt say that im saying i dont use a bike with it. Didnt say Honda didnt need it, Glen and you might like it I like my bike as Im used to it and can ride it without it is what im saying. Dont always jump to conclusions and say that I think I know better Im saying what I like and thats my bike.

Dang, so thats your secret then? No powerjet carb means very fast bike. Right, i'm pulling my powerjet out tomorrow and maybe I'll have a chance of beating you at Manfeild in a few weeks.

[Ivan]

haha nah but you run your power jet and I run my jetting perfect not saying you dont and my gearing for the track which probably gives me almost the same power as ya power jet carb, plus Im used to riding without one I havent rode with one but like my bike as is I choose to stay on my 96 rather than get a 98 RS125 I let my brother have that and I out rode him just means I have to ride alot harder round the corners to get some drive out the exit to stay ahead


HATE MY SPACE BAR IT IS HARD TO USE

[k14]

So if the 98 is faster then why don't you take it so that you can go even faster overall? Oh yeah, guess that would that be unfair on the competion aye? Want them to think they have a chance aye?

[Ivan]

No I honestly dont think owning a newr bike is gonna make a huge difference I like racing my bike and me and my brother argue about who is the betterrider so i said you have the faster bike then if i beat you its your fault not the bikes.

I dont think I am gonna kick ass I dont know were you get this from?
I do know tho this season I am a better rider than last season and I know alot of riders who would agree.
One being the guy who wrote this thread

[Sketchy_Racer]

Ivan, have you ever taken into consideration, that you only adjust the main jet on your bikes?

Sure, it may be running great at full throttle, but the thing is, How much of a track do you really sit at full throttle?? maybe 25-30% at some.

Mid range and smooth power is far more critical than just full throttle peak HP.

This is where the powerjet comes into its own. It wont give the bike more peak HP, but it will give it a far better midrange, for a good drive out of the turns.

Correct me if im wrong

[Ivan]

Yeah oh well i got it running well and you know it works for me so I dont care powerjets a cool idea andI like it just saying I can ride my bike without it, I think anything to make a bike better and more rideable is better
The 96 luckily is a good engine also and is quite rideable compared tot he 93 etc

[Dodgy]

I think the PJ only really works well with unleaded anyway? The theory is magnificent but I found it didnt make too much difference with avgas. Best to put the cutoff down lower, 12250 should be a better bet than 12750

Agree with RG100, setting up the needle and pilot pays dividends. Problem is that the taper on the PJ needles is only really for unleaded fuel anyway and there is only one clip postion that works anyway. At least (if you are runing avgas), the earlier models offer more flexibility.

Rg, did you get my PMs? I sent you some about the chamber and your suspension setup.

[Sketchy_Racer]

No sorry.. havent got any PMs