Yakama wrote:

petrolhead19 wrote:might think about the 440 for my 23 then, i think 480 might be a bit too big and make the sleeves too thin

I have one of these big bore kits for my 23 but havent fitted it yet. Benn lying in my shed for a few years now

If you dont end up fitting it might buy it off you in the future when i have the cash lol

Yakama wrote:I have one of these big bore kits for my 23 but havent fitted it yet. Benn lying in my shed for a few years now

You're not the only one.

Not sure if they have been relined though. Wouldn't know how to tell either if I'm honest.

Yakama wrote:

petrolhead19 wrote:might think about the 440 for my 23 then, i think 480 might be a bit too big and make the sleeves too thin

I have one of these big bore kits for my 23 but havent fitted it yet. Benn lying in my shed for a few years now

This baffles me. Why go to the trouble of fitting new pistons etc. for an extra 40cc, when you could spend similar money on a 600 engine swap? I wonder what you can bore those out to.

amorti wrote:

Yakama wrote:

petrolhead19 wrote:might think about the 440 for my 23 then, i think 480 might be a bit too big and make the sleeves too thin

I have one of these big bore kits for my 23 but havent fitted it yet. Benn lying in my shed for a few years now

This baffles me. Why go to the trouble of fitting new pistons etc. for an extra 40cc, when you could spend similar money on a 600 engine swap? I wonder what you can bore those out to.

600cc V4???? Show me one and i'll buy it

amorti wrote:

Yakama wrote:

petrolhead19 wrote:might think about the 440 for my 23 then, i think 480 might be a bit too big and make the sleeves too thin

I have one of these big bore kits for my 23 but havent fitted it yet. Benn lying in my shed for a few years now

This baffles me. Why go to the trouble of fitting new pistons etc. for an extra 40cc, when you could spend similar money on a 600 engine swap? I wonder what you can bore those out to.

Talking about the NC23, for me I decided to go for the 480cc conversion as I managed to source one at a very reasonable price. The cost of doing the 480 are roughly the same for a 440 excluding the cost of the piston/ cylinder which can fluctuate, that is a set of gaskets if you can do the work yourself (I can).

Compare that with a 60cc conversion. Basically its reframing a 600. You need the engine, carbs, loom, cdi, exhaust, and one or two other bits from what I remember when I looked at it. Or consider it another way take a 600 and replace the frame with a 400. But its not that simple the frame needs modification. The front spars need to be cut and rewelded (Some thing I can't do).

So based on that I think it would be easier and probably more cost effective to just up the cc by a bit rather then attempt a 600 conversion. But yes you can big bore a 600, you could even fit a different engine say a fireblade engine to a 400 (this has been done for a 29 from what I remember). The possibilities are endless, each to their own, it all depends on how deep your pockets are etc...

I think the 442 big bore gives the NC a whole load more grunt - or so I'm lead to believe, - true its not a 600cc, but allows the bike to put out as much power as some of the older 600ccs (SRAD?) with extra tuning and dyno time.
If you are building a trick bike and have the cash - why not?!
The NC's are known for their handling - with more power - which most people try to get - why not have an awesome track weapon?!
I'd do it if I could afford or justify to my wife!

Has anyone used this on a Nc30 for the road and what real improvments does this kit give you?

RO has one.

hello i need hellp,lol i from portugal and a need pistons to my vfr 400 ,prices ???