The New Kawasaki ZXRR125GP

[JayRacer37]

Also, Manfeild has lots of banking when your at hi-lean, so when you go to a track like ruapuna, with nothing but flat corners, always end up with a front spring rate thats too heavy and chatter, slides or lack of load due to, the front end not being loaded up by banking. and, at Manfeild, you can run a bike higher ride -hight wise, as you don't really need to factor in changing directions. When you get down south, tracks have sections of corners rolling inot each other, so the bike needs to change direction well to. but then they dont steer well though long slow corners...whick ruapuna has many!!! ARRGGGG!! too bloody difficult!!

[JayRacer37]

In short, there is no perfect set-up anywhere, anytime. But there is ALWAYS an optimum comprimise...adnt his can be very diffrent for two diffrent riders!!!!! SOOOOOO.....why would you have someone who rides completly different to you, fine tune damping adjustments, and then belive them when they tell you its right?? You have to set a bike up for YOU. Other people can help to get the feedback out of you, but it has to be right for the person thats actually riding it.

[roogazza]

Arrrh ! grasshopper ! so wise ! Gaz.

[Skunk]

Come on man, you know Ivan is the suspension guru, he knows how to do it all. How else do you think he goes soooo fast round there

You're just jealous of how good he is.

One day, Jay and K14, you will be at that level. There is no hope for me so I can only watch in awe.

[k14]

You're just jealous of how good he is.

One day, Jay and K14, you will be at that level. There is no hope for me so I can only watch in awe.

Yeah well hopefully I can get some tips off ivan when I come up to Manfeild in a few weeks time. I think it may be a bit far fetched to hope to be better than Ivan, one can only hope to be half the racer he is.

[JayRacer37]

You're just jealous of how good he is.

One day, Jay and K14, you will be at that level. There is no hope for me so I can only watch in awe.

Jealous is an evil thing...so i'm putting his speed down to a lap round the club circuit!! ha! im SO not jelous..*mumble, winge, complain*

[F5 Dave]

Shesh, the young man has gone from being a shy whippit who wouldn’t say boo, to stringing together the above spiel which is by far the most sensible thing in this thread. Hope you are using that brain to lever your way into a decent career so you can afford all this expensive motorbike lark.

[JayRacer37]

Shesh, the young man has gone from being a shy whippit who wouldn’t say boo, to stringing together the above spiel which is by far the most sensible thing in this thread. Hope you are using that brain to lever your way into a decent career so you can afford all this expensive motorbike lark.

I didnt say boo, cause I didnt have boo to say
Iv'e learnt a HELL of a lot over the past few years, mostly from boucing off guys VERY much like yourself at th bukets....best learning ground ever, cause it doesnt hurt to bad if you learn the hard way!!
I'm doing my best, its been a bundle of fun "using that brain" to help develop the new Conti race tyre...what a f**king brilliant experience. Bring on manfeild, and another winter of riding little bikes far to hard..go the buckets!!!

[Sketchy_Racer]

I think everyone will agree that made no sense either.

[translates] I had too hard a spring for me, so you put a harder spring in?

I'm sure Glen got all excited & was just a typo. Probably had a hard spring in there for Dodgy Si's more stately proportions

Yep typo, I had 'heavy' bouncing around in my head, and wrote it wrong.

It was supposed to say, "the spring i had was too heavy, so we put in a softer one"

Makes more sense that way huh

[k14]

Yep so what weight was originally in there and what did you replace it with?

[Sketchy_Racer]

I have two springs,

One which is standard + 1 other one that was too hard. So i can only assume the harder one was 7.5kg/mm and we put the standard 7kg/mm back in.

What i am trying to achieve on the bike is that it handles the faster corners at manfeild, because they are the most crucial.

The problem i was having, was the bike was getting really unsettled on high speed bumps.
Coming out of turn 1, then the follow through right hander as you exit, i was trying to hold full throttle, but there are two bumps in the middle, that the bike got really unsettled, and it would get into a semi vicious 'weave' (for a better word?) Then it got really interesting, as i then had to try get the bike to switch to a left hander, with a bit of trail brake. It got real interesting one lap, i stood the bike up, but the back was still all over the show. As i started braking (a bit to hard) the back wheel came up, and went slightly sideways. Which then was even more interesting, as when it came back down i was starting to tip into splash.

Unfortunatly, in the last two laps of the last session, i decided to get my weight off the seat and onto the pegs. Wow, what a difference. The bike still didint respond well to the bumps, but I could control the bike far better.

One more thing i learnt, if you get a bit carried away exiting the hairpin, it can spin up the rear wheel, if your still cranked over!! I never thought it would have the grunt to do that!!

Love these bikes, i can't wait to really get the hang of them. I know i need to get the '150' riding attitude outta me, as its far to rough for the lightness of the 125s. But we'll get there.

-Glen

[Ivan]

Sweet man go hard aye

[JayRacer37]

I have two springs,

One which is standard + 1 other one that was too hard. So i can only assume the harder one was 7.5kg/mm and we put the standard 7kg/mm back in.

What i am trying to achieve on the bike is that it handles the faster corners at manfeild, because they are the most crucial.

The problem i was having, was the bike was getting really unsettled on high speed bumps.
Coming out of turn 1, then the follow through right hander as you exit, i was trying to hold full throttle, but there are two bumps in the middle, that the bike got really unsettled, and it would get into a semi vicious 'weave' (for a better word?) Then it got really interesting, as i then had to try get the bike to switch to a left hander, with a bit of trail brake. It got real interesting one lap, i stood the bike up, but the back was still all over the show. As i started braking (a bit to hard) the back wheel came up, and went slightly sideways. Which then was even more interesting, as when it came back down i was starting to tip into splash.

Unfortunatly, in the last two laps of the last session, i decided to get my weight off the seat and onto the pegs. Wow, what a difference. The bike still didint respond well to the bumps, but I could control the bike far better.

One more thing i learnt, if you get a bit carried away exiting the hairpin, it can spin up the rear wheel, if your still cranked over!! I never thought it would have the grunt to do that!!

Love these bikes, i can't wait to really get the hang of them. I know i need to get the '150' riding attitude outta me, as its far to rough for the lightness of the 125s. But we'll get there.

-Glen

Yeah ur spring change should help that, its been a while since I had a chance to play round with a 125, but in essence, to fix the problem over bumps ur describing, you need to 1)lean over less so the suspension can have a go at working in a vertical plane rather than horizontal, 2)get into the suspension and reduce the high speed (compression) damping to let it react faster over bumps (not externally adjustable, dunno, can you do this on a RS125??) 3) get less sidewall stiffness out of your front tyre, either by getting a different construction or dropping pressure. Remember with no weight over the front end and little chassis flex the 125 is never guna be much good over mid turn bumps, this is a place more people than just you have struggled at, I had a few good moment's like you've described there - per session!! For fix 1), hang off the bike more, get your weight inside it, this will have the bike more upright when you hit the bump. This lets the suspension do more to soak up the bump. For this to work well, fix 2) needs also to be in place, as it still may be a bump that is too 'quick' (short sharp and sudden) for the suspension as it is. Fix 3) part i), beta get ur ass in world MotoGP125 so Dunlop will build and supply you diffrent tyres. Fix 3) part ii) will help over this particular bump, but comprimise the stability elsewhere, and poss. overheat/overwork the tyre. This is definitly somthing that could/should be tryed at 'Minefeild'. Sori to say, but all the spring change is really going to do (IF, and all I got is the above quote to guess off, that place is the only one you have a problem at) is give you less avalible travel and more sag, on the breakes, and in hi load corners (sweeper, higgins, all th banked ones), thus comprimising yur speed at these points (all the important ones) for a more comfortable feeling bike at one 'bad' point.
Hope this can help you in some way!!!

[Ivan]

Sweet jay thanks for that makes alot of sense

[steveyb]

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