NSR De-Restriction?

[18_stuart_88]

Should i attempt to de-restrict it myself or should i take it to a garage.

If anyone has a good step by step guide that would be AMAZIN!

Stu

[G]

Do it yourself.

www.nsr125.com

[18_stuart_88]

Do you know how fast it will go after all that is done to it?

Stu

[G]

Have you read the derestriction guide on the site?
I suggest you do.

For a good condition engine, expect an indicated 100-110, depending on conditions. Real speed probably about 10mph under that.

[John C]

I've had 104mph out of mine.

May I suggest you use an oxy-setaline torch to get the restrictor from the exhaust, otherwise you'll be there all day and cost your self a fortune in fucked up drill bits. The torch will melt the welds first, as they melt at a lower temperature than the rest of the exhaust. Once the pipe is out use a reamer to clean everything up.

[18_stuart_88]

Im still contemplating on doing this myself sounds like realy hard work and from that manual on the site it looks pretty tricky. And i dont wanna put ma bike outa action for about a month by fuckin it up and being unable to take it to a garage.

Stu

[John C]

I can understand if you're a little worried about taking a drill to your exchust, but at very least do the intake plate yourself as you'd be mad to pay someone to do it for you.

[OreoXX]

I definitely agree with NSRSparkie, the intake restriction takes about half an hour tops to remove and you don't wanna waste a lot of pounds for a garage to remove it for you. Do as the guide says, although it isn't necesssary to remove the plastic tray where the servo motor is located, just remove the tank, airbox, carb and inlet manifold. You will see a thin metal plate with a hole in the middle, take it out and throw it in the garbage.

The exhaust is a bit trickier, if you're not comfortable with using a drill, you could always use a torch if available.

Good luck m8, let us know how it goes

[alains]

do not forget to upjet at 138,42,65 otherwise danger !
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the worst day fishing is better than the best day working

[John C]

[alains]

just notice that : over 9500 rpm , if you mixture is too lean you've got a big risk of a piston breaking down and very often the barrel will be damaged !
____________________
the worst day fishing is better than the best day working

[True Blue]

[alains]

hey ! oreoxx i will put £10 on the table if you take off the intake plate and re-mount everything within 1/2H , i will bet 3/4 if you are good , 1H if you are average !
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the worst day fishing is better than the best day working

[18_stuart_88]

and about 1 week coz i am shit, lol.

What kinda tools do i need to do this exhaust bit then, and how will it help speed/performance wise?

Stu

P.s alains im still looking for the CDI

[OreoXX]

[alains]

stuart , you are misleading the intake restrictor (which is a plate between carb and reeds) and the exhaust restrictor which is a chicane inside the exhaust system . the intake plate is quite simple to take off (not 1/2 h as said oreoxx especially for a begineer) , but the exhaust is much harder , this is why i recommand to replace the genuine exhaust system by a jollymoto race system (£205-245 depense on which can) . if it's a french import (as you said) you need to cut the exhaust where the chicane is , take the chicane off , and re-solder the 2 bits as they were before . you must use only oxy-acethylen torch , electric ark will not work . if you want details on how to do it , just pm me
____________________
the worst day fishing is better than the best day working

[True Blue]

No need to cut the exhaust when I done mine. Drill out the welds and take the restrictor out. Simple.
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Past >>>> Honda NSR 125 >>>> Suzuki GSXR 600 K1 >>>> Suzuki GSXR 600 K4 >>>>Kawasaki Z1000 DAF >>>>Suzuki RMZ 250 >>>> Current >>>> KTM Superduke R 1290 >>>>

[John C]

Same here easy

[alains]

hey , guys
if he has a french import , the restrictor is not at the exhaust entry , it's about 8-9" down in the pipe . we introduce a steel wire inside to mesure exactly the length . we report outside , make some marks , then cut it down . after taking off the chicane , we re-solder the 2 bits !
____________________
the worst day fishing is better than the best day working

[True Blue]

Best thing to do is to take the exhaust off and have a look.
____________________
Past >>>> Honda NSR 125 >>>> Suzuki GSXR 600 K1 >>>> Suzuki GSXR 600 K4 >>>>Kawasaki Z1000 DAF >>>>Suzuki RMZ 250 >>>> Current >>>> KTM Superduke R 1290 >>>>

[alains]

exactly !
____________________
the worst day fishing is better than the best day working

[2strokecrayze...]

hi, i found this and the nsr site when i was looking for information to derestrict my sisters '04 nsr125
took the exhaust of and drilled the welds, okay and a bit of hammer and chisel action lol.
stage one complete, going well i though to myself, it'll be un-restricted by the time she gets home.
next, i took the carb off only to fine that there were two one way screws at the bottom that i can get off with grips (because of the position/lack of room)

has anybody else had this problem?
any ideas on how to get em out?
i phoned honda and they said they dont give out information and they dont de-restric bikes either.

any help would be great! i dont want to have to either take the engine out so i can use grips, or hacksaw the heads off then use grip.
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keep it smokin'

[John C]

Photo

No one way screws I can think of.

If they are meant to come off you'll be able to get a security bit from somewhere

[swampy]

[swampy]