For all that you might as well get an RS250. _________________ james
Its not how fast you go...Its how you go fast.
MC21 Rothmans
RS250
RC31
CRF250X
748R
Porsche (many)
http://members.rennlist.com/j911brick/rennlist3_002.htm
Bit harder to keep between the hedges at night though eh? _________________ MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball
A stock '92 RS250 makes around 72bhp, a '99 RS250 makes about 76bhp. For sure the NX5's and later TZ's will make 80+bhp much easyer than an F3 NSR. At the end of the day the F3 is a mod'ed road bike as well as being over 10 years old so to be beating and getting close to the new full spec RS's and TZ's its doing well.
The F3 has better midrange than both the '96 TZ and the '92 RS but I think feels slower than both because of the lack of dips on the way up. The TZ feels like it pulls harder just because the F3 has such good midrange power.
I dont think there is much more in it, I think the most Matt has had out of one is 76bhp? So if i can get close to 73-74 on unleaded I will be most chuffed.
Heres another couple of graphs. An RG500 vs F3, and my own ex 300 vs the F3. Not much in it for being 50cc up!
_________________ If I have to take the carbs off once more...
I thought the RS 250 would make allot more power. I was thiiking they made about 90+ back in the late eighties (at least for the factory bikes). I seem to recall they were not that much slower than a 500 on a GP circuit. How much does the RS250 weigh? _________________ james
Its not how fast you go...Its how you go fast.
MC21 Rothmans
RS250
RC31
CRF250X
748R
Porsche (many)
http://members.rennlist.com/j911brick/rennlist3_002.htm
It's only now that the kind of (GP) machinery we lusted after back in the 90's (NF5's to '93, and NX5's after) is readily available/affordable and owned by "normal" people, that the truth is being discovered!
As far as I'm aware, it wasn't until 2000+ that the 250's were making over 90hp - and they were "works" 250's.
I believe the 250 GP bikes can/could weigh 100kg. I think the lightest you'll ever get an NSR is about 120kg. Add to that most GP riders don't weigh much more than a feather, and I reckon most Western road riders probably weigh 80~100kg, you could be giving up 50kg to an RS or TZ... relatively speaking, that's a lot of HP!! _________________ Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
In that case the NSR should be quite a performer compared to RSs back in the day. _________________ james
Its not how fast you go...Its how you go fast.
MC21 Rothmans
RS250
RC31
CRF250X
748R
Porsche (many)
http://members.rennlist.com/j911brick/rennlist3_002.htm
Year on year the RS's tended to make 2~4hp on a full F3 (MC18 & MC21) NSR, but weighed in at least 20kg less.*
For example, a 1990 F3 MC21 built with all HRC parts is reportedly 72hp - a 1990 HRC RS250R NF5 is reportedly 74hp "out of the box", before you start playing with it!
Like I say, the weight difference (and much better suspension) makes a hell of a difference. An F3 spec' NSR is a rapid piece of kit... you should try one!!
The thing is, it shows just how close an 89~91 NSR can be to an RS though!
*Note: HRC book figures. There were plenty of HRC kit parts to boost the power of a "standard" RS, as well as Jha, MotoBUM, iFactory, HARC Pro, KISS Racing parts etc., but the bikes were never making as much power as we were led to believe.
All it does is make those of us who are honest enough to accept it, realise just how talented the guys who raced them really were. _________________ Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
My HRC book does not show a F3 "kit". I just recall a few bits and pieces, but nothing I would think that would make that big a difference. _________________ james
Its not how fast you go...Its how you go fast.
MC21 Rothmans
RS250
RC31
CRF250X
748R
Porsche (many)
http://members.rennlist.com/j911brick/rennlist3_002.htm
F3 parts arnt covered in the ss/sp HRC manual. Like the saying goes, lots of small improvments can turn into one big one. Thats the case with the F3 kit. _________________ If I have to take the carbs off once more...
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