Hello everyone,
I've just taken the plunge and bought my first nsr (MC21) which I hope to race at club meetings.I need all the edge I can get to reach the midfield pack so I'm very interested in the references to NSR300!!!
Is it really a 300cc NSR? What does it go like compared to a 250cc? Can I simply change barrels/cylinders?
Any help/info. will be greatfully received,
regards Will.

i was wandering this too, is it a nsr250 with nsr150 barrels. or nsr125 big bore barrels as the pins are biggere on the nsr125 but wouldnt need much to make a nsr250 pin fit in a 125 big bore piston
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Honda nc23 CBR400 AERO 1986, 1990 honda NC23 Tri-Arm, 1987VFR400 NC24 Rothmans Rep, NSR250 MC16 1987, CL250s 1983. Moto guzzi zigolo 110cc 1958. Fantic 50cc 1972. Suzuki Cobra Race bike 500cc 2t 1975 , GP125 1975. Triumph T110 1954. BSA Thunderbird 1955. Ariel VB 600 1952, 1990 MuZ 125 etz.

Ask the Tyga boys.

As far as I know they are modified NSR150 Barrels.

Although cheating isn't the answer.
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If you dont like the way that i ride.....Stop trying to keep up!!!!!

They're machined 150 barrels, that bolt right onto the 250 cases.

No point trying to race it that way though, since if caught you'd be thrown out instantly - and what's the point in cheating to win? Not winning at all is it?

Spend your money on suspension first, then training, and finally on the engine.

Oh, assuming you've de-restricted it of course!
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Racing an MC21 as a 300 isn't necessarily going to solve where you run in the pack, because if you race in a series that allows 300cc 2-strokes, then generally the bikes and riders you are up against are going to be bloody fast!

No 300 I've ever ridden has been as quick as a properly sorted 250.

As a (fast) road bike however, the 300 will be superb for the vast majority of riders. The main benefit of the kit is the fact you are getting all brand new components - some people don't like re-plated cylinders, and OEM Honda plating is the bollox!

To say the 300 is built on machined 150SP barrels though is a little bit of an understatement. It is a very comprehensive kit, a lot of machining, and took a lot of (continuing) development.

My single piece of advise if you are seriously considering a 300 kit though, is to ask TYGA about a Wiseco piston option. Every kit is made to order, so you want it tailored to the pistons while it's all being machined up.
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Andy.
NSR-WORLD.COM

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Andy wrote:

No 300 I've ever ridden has been as quick as a properly sorted 250.

MUST........ NOT........ TAKE............ BAIT........
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NSR300R - Why did i ever have a 250...

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Andy.
NSR-WORLD.COM

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Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

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The NSR300 kit may help some guys go quicker, especially if they're not experienced enough to take advantage of a tuned, well sorted, 70hp+ 250cc. A high revving, high power 250cc can be tricky to ride is you're not in control of the power.

One of the advantages in the stock 300cc kit is the midrange grunt, which helps with gearing choice (not as critical perhaps). These characteristics are controlled mainly by the porting and head design.

The stock kit is great for the street rider thanks to it's driveability, but if you're a real two stroke fanatic (like Andy) then you probably need something a little extra.

I've just changed the spec on the kit I'm putting together now, to add a little more at the top. Basically because it annoys me that Andy doesn't like the standard kit and we can't have that now can we This will now be the stock spec.

Matt@TYGA wrote:I've just changed the spec on the kit I'm putting together now, to add a little more at the top. Basically because it annoys me that Andy doesn't like the standard kit and we can't have that now can we This will now be the stock spec.

Back to 250cc now eh Matt?
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If I have to take the carbs off once more...

Damn, I've been rumbled.

You're just stressed because your bolt together F3 is below my 300 on the poser league

And you know it'll be untouchable after the next bunch of mods

lol Mine is pure unlike some.

And youre right, mine will be untouchable after the lastest mods, plus its not a tractor.
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If I have to take the carbs off once more...

As pure as the best HRC could come up with anyway. Pah....what would they know? I don't trust them. They never give you the real stuff.

All that HRC rubbish I was gonna put on my bike I had to modify in some way or another to get it to work properly.

It's only that chip changing F3 PGM I've left as God Himself built it. Now, He does know what He's on about

You just dont trust em now youve seen a MC28 F3 crank.
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If I have to take the carbs off once more...

That's exactly right Steve....you're not wrong.

Sneaky ..........

Oh, that motor I sent you pics of....got some more. Cunning NSR Stator conversion onto RS bottom end

Yeah, but it's not necessarily going to be cheating is it?
Bemsee for one allow up to 400cc two strokes to race in their 400 class...
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