zxr 250 restrictor problems

**freakazoid3** · 16th April 2007, 07:22

hello

i am a newbe at this forum but if recently fixed up a zxr 250 A of 1991.
and i have restrictor problems; it only does a max of 16000 rpm, more like 15500 rpm.
and it maxes out at 180 km/h, i dont think this is normal
right?
please if someone has experience how to delay this problem i would be gradeful.
i know my part of motorbikes and tuning, but the electrics aren't my best friends...

kind regards

**Sniper** · 16th April 2007, 11:24

Im not 100% sure of the revs, from what I understand, a bike will always limit you from going too far into the red but yes they are restricted to a top speed of 180KPH. Any reason why you want to go faster considering the speed limit in Belgium is 120kph on the motorway?

**steved** · 16th April 2007, 12:09

Originally Posted by Sniper

Any reason why you want to go faster considering the speed limit in Belgium is 120kph on the motorway?

Germany close by? Track days?

**Dave-** · 16th April 2007, 12:48

Nuremberg.

nuff said.

**Nonbeliever** · 16th April 2007, 16:17

Originally Posted by freakazoid3

hello

i am a newbe at this forum but if recently fixed up a zxr 250 A of 1991.
and i have restrictor problems; it only does a max of 16000 rpm, more like 15500 rpm.
and it maxes out at 180 km/h, i dont think this is normal
right?
please if someone has experience how to delay this problem i would be gradeful.
i know my part of motorbikes and tuning, but the electrics aren't my best friends...

kind regards

freak

91 is a "c" I believe

those things should pull like 19000rpm

**freakazoid3** · 16th April 2007, 21:27

well i've just looked at my registration and it defenedly is a zxr 250 A build in 1991.
it was one of the first models with the 2 round headlights at the front and the big blocked rear.
and yes i do want it to rev above 16000 rpm.
when the rev counter indicates that it is in the red zone at 19000 rpm, i dont want it to stop at 16000 rpm.
and i dont really care about the speed limit beeing 120km/h because i dont do alot of motorways , rather small country road, where you can defently go faster that 180km/h.
so if anyone has a clue about how to derestrict my motorbike, all solutions are welcome...

thanks

**Simon A** · 17th April 2007, 00:01

180km/hr sounds about right for top speed, I could never get mine over 180.

**freakazoid3** · 18th April 2007, 07:20

well i have solved the problem already.
the thing is; it has a speed restictor to limited the bike to 180mk/h , this restrictor are some elektronic component in the speedometer itselfe, but i changed my speedomter for one of a zxr400, because they read to 240km/h, and not 180km/h.but that meant that the wires leading from the restrictor where not plugged in.
so my bike thought that i was in last gear all the time, and driving at top speed.
i opende the original speedometer and took the restrictor out, dismanted it, so it would not restrict and fitted it sepreratly.
so now it does its 21000rpm and it will probbably go faster than 180km/h too.(i havent tryed it yet)so problem solved, and i read somewhere that now it will go over the 200km/h, i hope so!!

greets

**rookie** · 18th April 2007, 19:08

Originally Posted by freakazoid3

i opende the original speedometer and took the restrictor out, dismanted it, so it would not restrict and fitted it sepreratly.
so now it does its 21000rpm and it will probbably go faster than 180km/h too.(i havent tryed it yet)so problem solved, and i read somewhere that now it will go over the 200km/h, i hope so!!

greets

let us know how it goes.

**Simon A** · 18th April 2007, 21:45

There's no way a zxr250 will do over 200, the gearing won't allow it. Nor will it do 21,000rpm, even the 19,000rpm redline is a little lie, it's actually doing more like 17,000.

**rookie** · 18th April 2007, 21:50

I agree the 21,000 revs is a bit far fetched...200 is possible on a slightly tweaked zxr...talk to n4cr

**freakazoid3** · 20th April 2007, 04:07

Originally Posted by Simon A

There's no way a zxr250 will do over 200, the gearing won't allow it. Nor will it do 21,000rpm, even the 19,000rpm redline is a little lie, it's actually doing more like 17,000.

well, soon i will see whether or not the rev counter is not correct, because i am going to test a digital rpm counter which should be accured to 18.000rpm.
so when it read more then that it fine!
my zxr is slightly upgraded, with a k&n filter and rejetting and racing exhaust, i also changed the sprockets to my drivingstyle.(i only weigh about 70 kg so a larger front sprocket was called for.
after testing now(which i still havent done) i am going to try to fit zxr400 carbs.
because they are VHM 32 mm mikunis in staid of 30mm mikunis, the jets are more or less the same, so i will try them and hopefully suceed with maybe a little rejetting.

i will test it tomorrow, and let you know whether its possible to drive faster then 200 km/h an a zxr 250...

greets

**rookie** · 21st April 2007, 16:43

Originally Posted by freakazoid3

well, soon i will see whether or not the rev counter is not correct, because i am going to test a digital rpm counter which should be accured to 18.000rpm.
so when it read more then that it fine!
my zxr is slightly upgraded, with a k&n filter and rejetting and racing exhaust, i also changed the sprockets to my drivingstyle.(i only weigh about 70 kg so a larger front sprocket was called for.
after testing now(which i still havent done) i am going to try to fit zxr400 carbs.
because they are VHM 32 mm mikunis in staid of 30mm mikunis, the jets are more or less the same, so i will try them and hopefully suceed with maybe a little rejetting.

i will test it tomorrow, and let you know whether its possible to drive faster then 200 km/h an a zxr 250...

greets

yep that should do it...practise tucking in really tight as well...the small your frontal area the better...

**R6_kid:Me** · 21st April 2007, 16:49

I've clocked a ZXR250 at 205 and it still had a bit more left in it, and that was me riding next to it.

Also i guy who used to post here with the screen name John had a somewhat faster than everyone elses ZXR250 that had a few mods, if you look at his account and check his post history you might be able to find what he did, i do know he was running a 240kmh speedo.