SRC475 2T

[Demannu]

SRC-475-V3.jpg (129.8 KiB) Viewed 249 times

Opinions people?
Hope he's toughened up the gearbox!
Personally I'd have saved a wedge by fitting decent suspension and modern bodywork onto the NS chassis.
Nothing wrong with it in the first place.
https://www.hotcars.com/things-we-learn ... rc-475-v3/

[MingtheMerciless]

I like it.

[Le_Fromage_Grande]

NS400R wouldn't be my choice of bottom end, they're not strong with a 387cc top end, but as I've said before I don't see the point of highly tuned 2 strokes in modern motorcycling, modern 4 strokes spin up like 2 strokes and there are plenty of powerful compact 4 stroke engines now.

[Skub]

Very pretty. I bet it sounds good.

[The Spin Doctor]

Nice.

[Bustaspoke]

Opinions people?
Hope he's toughened up the gearbox!
Personally I'd have saved a wedge by fitting decent suspension and modern bodywork onto the NS chassis.
Nothing wrong with it in the first place.

My opinion is the same as yours
I love the old two strokes of my youth,but they're from a different era.
I don't see the point of something like this.If I wanted a Supersport bike on the road I'd spend my time & money upgrading a R6 or CBR600RR.

[Demannu]

I had an NS.
I sorted the squish out, raised the compression a bit, cleaned up the atac valves (TS pipes dispense with them anyway), flowed the crankcase, trued the crank, cleaned up the transfers/exhaust ports etc and after a morning on the dyno it gave 65rwhp and quite a nice pull from 6k, really getting going from 7.5k. Cbr600 wheels were 'slotted' in which allowed decent rubber to be fitted and it would hang onto mk1 fireblades through the twisties, which was always a laugh to see them checking their bike over to see what was wrong with it!
Only weak point was 2nd gear which would jump if the change was rushed, round the dogs off/tweak the selector and hello rebuild!
I toyed with fitting TZ350 pistons but the bores were nicasiled, so a bit more involved than a rebore.
I would imagine 88hp/300lb makes for an interesting ride! Saves on front tyre wear.

[Supermofo]

Yeah would like that I'm my garage next to the council house GSX

[Screwdriver]

NS400R wouldn't be my choice of bottom end, they're not strong with a 387cc top end, but as I've said before I don't see the point of highly tuned 2 strokes in modern motorcycling, modern 4 strokes spin up like 2 strokes and there are plenty of powerful compact 4 stroke engines now.

No they don't. No filthy diesel is anything like a tuned two stroke. Plus it is an entirely different type of power delivery.

@8k rpm a plodding old 4cyl four stroke is giving you 16k power pulses. Plus half the time each cylinder is evacuating itself while still having to drive a very complex valvetrain at very high speed (that's 16 thousand "wasted" strokes just to keep the engine running).

@8k rpm a 4cyl 2 stroke is giving you 32 thousand times its swept capacity in power strokes every 60 seconds. Not only is the power delivery inherently smoother, it uses sound energy to evacuate each power cycle way more efficiently. Now while that may not even be strictly true, it is my strongly held conviction for which I would be delighted to be "put right" by anyone who knows that rather esoteric aspect of engine efficiency.

Yes plodding 4 strokes can use "tuned" exhausts too but that's only really to try and minimise the inevitable inefficiency of valve overlap. The 2 stroke unapologetically embraces its wasteful use of resources and the expansion chamber is effectively an integrated part of the internal combustion process.

[Screwdriver]

PS that thing above is fucking lovely. Fact.

[Mr. Dazzle]

The fairing looks like a weird Chinese eBay job to me and nobody has any business co-opting the HRC logo like that.

Other than that, s'alright I 'spose.

[Tricky]

SRC-475-V3.jpg
Opinions people?
Hope he's toughened up the gearbox!
Personally I'd have saved a wedge by fitting decent suspension and modern bodywork onto the NS chassis.
Nothing wrong with it in the first place.
https://www.hotcars.com/things-we-learn ... rc-475-v3/

Thats beautiful ( cacky little home-bodger reservoir brackets aside)- I think it's a decent styling job, and I'd love to have it in my garage

[Mr. Dazzle]

Thats beautiful ( cacky little home-bodger reservoir brackets aside)-

Ha! Oh yeah...

They've gotta be a last minute thing to get it working for pics surely.

[Le_Fromage_Grande]

NS400R wouldn't be my choice of bottom end, they're not strong with a 387cc top end, but as I've said before I don't see the point of highly tuned 2 strokes in modern motorcycling, modern 4 strokes spin up like 2 strokes and there are plenty of powerful compact 4 stroke engines now.

No they don't. No filthy diesel is anything like a tuned two stroke. Plus it is an entirely different type of power delivery.

@8k rpm a plodding old 4cyl four stroke is giving you 16k power pulses. Plus half the time each cylinder is evacuating itself while still having to drive a very complex valvetrain at very high speed (that's 16 thousand "wasted" strokes just to keep the engine running).

@8k rpm a 4cyl 2 stroke is giving you 32 thousand times its swept capacity in power strokes every 60 seconds. Not only is the power delivery inherently smoother, it uses sound energy to evacuate each power cycle way more efficiently. Now while that may not even be strictly true, it is my strongly held conviction for which I would be delighted to be "put right" by anyone who knows that rather esoteric aspect of engine efficiency.

Yes plodding 4 strokes can use "tuned" exhausts too but that's only really to try and minimise the inevitable inefficiency of valve overlap. The 2 stroke unapologetically embraces its wasteful use of resources and the expansion chamber is effectively an integrated part of the internal combustion process.

If you say so, I know which I'd rather ride, and I do have both.

[Yorick]

I raced 2 strokes for years. But I moved on.

Nothing in the world can beat hooning round a track on a 200 BHP monster.

[Demannu]

I raced 2 strokes for years. But I moved on.

Nothing in the world can beat hooning round a track on a 200 BHP monster.

Remind us again which bike scared you the most?

[Screwdriver]

I raced 2 strokes for years. But I moved on.

Nothing in the world can beat hooning round a track on a 200 BHP monster.

I have no doubt whatsoever that a good 4t is going to run rings around a good 2t, rider ability notwithstanding. It really depends what floats your boat though.

I would beat myself on an old nail of a FireBlade against myself say, on a well set up 500 GP replica. I could probably do that with lazy gearshifting and of course corner blocking. Top end is always an issue with "consumer level" 2t's. To get the high speed needed to stay ahead of a superfast 4t on any straight, you need a bike that requires GP level talent just to hang on to the inevitable wheelspin. Inevitable: mid corner!

But I would not be racing for prizes or aiming for excellent lap times. I would be doing it to enjoy the challenge of riding a precision instrument as if it were a scalpel rather than the blunt axe of a torque monster. Wrong gear on the old FireBlade and at my level, just shrug it off and do it right next time. Wrong gear on a 2t and you're a dead duck.

The satisfaction of screaming into a corner, the type of late braking you can only do on a 2t, maintaining corner speed in exactly the right gear at exactly the right rpm and the thing fires out of the corner like wile-e-coyote on an acme rubber band. The feeling when you get it right is intoxicating and you really have to be "perfect" every time or you blow your lap.

But man, when you get it right, there's no better feeling in the world...

[Yorick]

I raced 2 strokes for years. But I moved on.

Nothing in the world can beat hooning round a track on a 200 BHP monster.

Remind us again which bike scared you the most?

Maybe the RG500

But it wasn't that much fun to ride.

[Yorick]

I raced 2 strokes for years. But I moved on.

Nothing in the world can beat hooning round a track on a 200 BHP monster.

I have no doubt whatsoever that a good 4t is going to run rings around a good 2t, rider ability notwithstanding. It really depends what floats your boat though.

I would beat myself on an old nail of a FireBlade against myself say, on a well set up 500 GP replica. I could probably do that with lazy gearshifting and of course corner blocking. Top end is always an issue with "consumer level" 2t's. To get the high speed needed to stay ahead of a superfast 4t on any straight, you need a bike that requires GP level talent just to hang on to the inevitable wheelspin. Inevitable: mid corner!

But I would not be racing for prizes or aiming for excellent lap times. I would be doing it to enjoy the challenge of riding a precision instrument as if it were a scalpel rather than the blunt axe of a torque monster. Wrong gear on the old FireBlade and at my level, just shrug it off and do it right next time. Wrong gear on a 2t and you're a dead duck.

The satisfaction of screaming into a corner, the type of late braking you can only do on a 2t, maintaining corner speed in exactly the right gear at exactly the right rpm and the thing fires out of the corner like wile-e-coyote on an acme rubber band. The feeling when you get it right is intoxicating and you really have to be "perfect" every time or you blow your lap.

But man, when you get it right, there's no better feeling in the world...

I did that for years. Times move on.