The best route for value/performance has surely got to be rebuilt/revalved/resprung SP stuff, this would be my choice.
To spend a bit more you could get RS forks and an RS125 rear shock, both will still need a rebuild to your weight if they're to outperform modded to suit you SP stuff .
After that you can go as nuts as you like, Ohlins rear shocks may well be awesome, they're also a lot of money and USD forks from anything you fancy will fit with enough effort, whether they work better than good stock stuff is open to discussion. _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
i'm running zxr400 usd forks and a cbr 6 fully adjustable shock!
took a bit of trial and error but definately an improvement over th worn out stuff i had.
Can you not pass up a chip shop or a burger joint???
If you are under 160lbs, I'd say get a SE/SP shock and install a Race-Tech gold valve along with a rebuild. I have one and it works great.
If over, keep looking for Ohlins/Penske/Fox shock with ride height adjustability. However, If you have aftermarket pipes, you'll be limited on how much you can raise the rear end on the MC21. With minimal machining work (drill press and a bench grinder), you could make a CBR600F2/F3 aftermarket shock fit. The stock Showa shock won't do you much good as it is a few mm shorter. I have been using a F2 Fox shock on my racing MC28 for a few years.
Hey Bro, OK so to let you know what im running and what i think of it;
Mine's a '21R and I've got an Ohlins shock at the back and RVF400 forks up front with CBR929 'Blade calipers, HEL braided hoses from Andy and some pattern discs off Tyga. The Ohlins shock set me back
£400, so about $1000NZ and the forks (well it was a complete front end off an RVF400) cost £700 from a breakers in the UK. They just needed the steering spindle thing pressing out the NSR bottom yoke and welding into the RVF yoke and the upside downers slid straight into the NSR frame. But it was a very dear way to do it and im not sure the upside down forks are any better than the standard ones - they just look more modern.
I'm 75kg and the bike weighs much less than standard as the airbox, 2T pump and tanks, standard plastics, subframe, kickstand and standard wiring are all gone. I'm also running a magtek at the back with my dry weather tyres. The RVF standard fork springs seem to be about the right stiffness - i've been told they're roughly the same stiffness as RS250 springs. I've used a cable tie wrapped around a stanchion tube to measure fork dive under heavy braking and it doesn't bottom out but uses most of the available travel so im happy with that.
The Ohlins shock though has seemed too soft to me - i think a stiffer spring from Rob at Crown Kiwi in New Plymouth will be on the shopping list in the near future.
What did your slicks cost you bro and where did you get them from? _________________ After years of moaning about immigrants now i am one...
Any late model 600 radial forks are good. I have a ZX636 complete front end on mine (thanks Neal) and a fully adjustable VFR400 rear shock. The bike is track only.
Or you can fit nc 30 forks , it's a cheap and easy swop . You get the bigger discs from the nc 30 too and your brakes are great ! You will be king of the late breakers ! Rear shock , rebuild a SE OR SP one if you find one .
If money is'nt the problem then ohlins is a must .
even if money no object i would still say get the rs shock then set up for you,will work the same as the ohlins but cost half the price _________________ ive seen more tarts than mr kipling
Am currently looking to upgrade my MC18R5 as well.
Was thinking Penske, for ride height adjustment (for the 17inch rear wheel change) and performance. It also seems slightly cheaper than the Ohlins from NZ
If I adapt something it will need a new spring and re valve anyway and will supposedly only be half as good.
The forks will be replaced with SP items with a re valve/new spring. To me the upside down issue is acedemic and the big diff should come from the cartridge.
After getting off my KR1s and NSR at the Taupo track and jumping on my brothers NSR400 with cartridge NC30 forks fitted, it was a huge difference.
Plush and planted versus skittery and no feel.
i really dont understand peaples need to buy expensive shocks when dans proved the rs shock works on the race track,the results dont lie.i think theres to many magpies as in go for the overpriced shiney shocks _________________ ive seen more tarts than mr kipling
I just bought a RS125 shock in decent condition for £45.00.
But be careful, these (and some other) piggy back reservoir type shocks will not fit the NSR with the standard subframe / battery box. _________________ Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30
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