CBR 250 RR, and CBR 250rj, difference

[justsomeguy]

How well the bike is tuned makes a HUGE difference to its performance.

Could you please elaborate on this.

What would you do to a CBR to make it a bit quicker.

[FlyingDutchMan]

Could you please elaborate on this.

What would you do to a CBR to make it a bit quicker.

Well if its poorly tuned, it can bog down, have flat spots, jumpy through the rev range etc... You tune it well, and it'll pull smoothly all the way to the rev limiter. And hitting the rev limiter should feel like hitting a brick wall. If it doesn't yourbike isn't tuned to the best performance.

To make the bike quicker than stock, well you'll have to give it a nice exhaust, perhaps the whole system, re-jet the carbs. If you want to further, get a new ecu made up (one without a speed restrictor), slap on a turbo, fuel inject it, etc.... your wallet is the limit really.

Getting rid of the speed restrictor is piss easy - cut one of the wires (the right one!) and attach it to another through a 5cent resistor. Done - no need to buy speed de-restrictors off trade me... they're just preying on the gullible. I saw one on there for $150 Thats one huge arse mark up for a 5c resistor in a little plastic box with a couple of wires and two plugs. Heres the link if you want to do that: http://www.cr-x.org/cbr250/forum/top...TOPIC_ID=19547
Interesting info on what a speedo de-restrictor is: http://www.cr-x.org/cbr250/forum/top...TOPIC_ID=22334

And one last note: having a wheel tensioned chain (1" slack) and well lubed does make quite a difference to the performance.

[mikey]

Isn't '88 the year it was first registered here mikey?? Most bikes do a bit of time in Japan before they are brought over here and registered.

no!
think about it.
say bikesRus import a 2003 fireblade today. they dont register it as a 2006. it gets registered as a 2003. unless ltnz or bike shop fuck up / try decieve customers.

[justsomeguy]

Well if its poorly tuned, it can bog down, have flat spots, jumpy through the rev range etc... You tune it well, and it'll pull smoothly all the way to the rev limiter. And hitting the rev limiter should feel like hitting a brick wall. If it doesn't yourbike isn't tuned to the best performance.

To make the bike quicker than stock, well you'll have to give it a nice exhaust, perhaps the whole system, re-jet the carbs. If you want to further, get a new ecu made up (one without a speed restrictor), slap on a turbo, fuel inject it, etc.... your wallet is the limit really.

Getting rid of the speed restrictor is piss easy - cut one of the wires (the right one!) and attach it to another through a 5cent resistor. Done - no need to buy speed de-restrictors off trade me... they're just preying on the gullible. I saw one on there for $150 Thats one huge arse mark up for a 5c resistor in a little plastic box with a couple of wires and two plugs. Heres the link if you want to do that: http://www.cr-x.org/cbr250/forum/top...TOPIC_ID=19547
Interesting info on what a speedo de-restrictor is: http://www.cr-x.org/cbr250/forum/top...TOPIC_ID=22334

And one last note: having a wheel tensioned chain (1" slack) and well lubed does make quite a difference to the performance.

What do you mean when you say tune?? What is involved ? I don't know much bout mechanical stuff...

I don't want any speed de-restrictors..... don't want to blow anything up.

My bike will pull strongly till 160 anyday. Then go uptil 175 if I want it to. I don't want to go any higher.

It's doing about 15-16Krpm at 160 and around 16-17krpm at 170ish. Thats as fast as I'll let the little motor go.

I'm more curious on what you mean by tune rather than anything else.

I usually ride out in the country somewhere and only care about quick throttle response not top speed.

[Firefight]

[QUOTE=justsomeguy

What would you do to a CBR to make it a bit quicker.[/QUOTE]



.....someone else to ride

F/F

[justsomeguy]

.....someone else to ride

F/F

Good point - lets swap bikes

[Firefight]

Good point - lets swap bikes

Have offered before man, you are more than welcome to take it for a ride.

its only a bike.


F/F

[justsomeguy]

Have offered before man, you are more than welcome to take it for a ride.

its only a bike.


F/F

Thanks I will take you up on that offer.

[Firefight]

[QUOTE=justsomeguy]Thanks I will take you up on that offer. [/QUOTE

let me you know next time we do 22, are you living out east yet ?


F/F

[FlyingDutchMan]

What do you mean when you say tune?? What is involved ? I don't know much bout mechanical stuff...

I don't want any speed de-restrictors..... don't want to blow anything up.

My bike will pull strongly till 160 anyday. Then go uptil 175 if I want it to. I don't want to go any higher.

It's doing about 15-16Krpm at 160 and around 16-17krpm at 170ish. Thats as fast as I'll let the little motor go.

I'm more curious on what you mean by tune rather than anything else.

I usually ride out in the country somewhere and only care about quick throttle response not top speed.

Ahhh..... i see you want to learn about the dark art of carb tuning. I don't really know enough to provide any advice, but this thread: http://www.kiwibiker.co.nz/forums/sh...ad.php?t=25560 seems to pretty good. Just add a few 1000 rpms onto his numbers.

[justsomeguy]

let me you know next time we do 22

Well most probably the weekend of the 18th or 19th March (I prefer Sunday the 19th) depending on when the other 4 riders I want to call and you are free - will PM you the details.

are you living out east yet ?

Yup a lot closer to your driveway (22).

[R6_kid:Me]

jsg i think flyingdutchman is referring to making sure the bike is running sweetly, not so much 'tuning it up' as far as modding it is concerned.

Have a good read through that aussie CBR forum, they have lots of mods you can do on there to affect lots of different aspects of the bike.

Saw one of those repsol replica CBR250RR's today... to be honest it looked stupid, not enough noise to live up to the paint job