Helloo RS owners.

The NX5 has a 15mm gudgeon pin in the piston, meaning it can be put on the NSR crank.

What I would like to know is, what is the distance from the NX5 gudgeon pin to the crown, and is the crown rounded like the NSR, or flat top?

Cheers
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The Chopster

I have bought nx5 pistons, flat and rounded.
I also have some kit pistons. Not sure why they are different?
I also don't own a nx5
I think they are considerably different in height to the nsr. The nf5 I hope are good for the F3 because I have loads and yet to check.
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mc18 F3, mc21 300, mc21ish sp, mc21/28ish.
cbr929, RC30, tdr250, rvf400, wave, gyro, joker.

What I know of A Kit pistons is that they run the ring gap over the boost port at the back of the cylinder.

Means that the A Kit cylinders can run bigger transfer ports, as the ring ends don't need a bridge to run on...

Also means a really long chamfer on the nikosil into and out of the port.
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The Chopster

Now I understand.
I actually bought them by accident. So I would need the kit cylinders and when I buy a nx5 I doubt it will have them.
So, if Matt can't use them I guess somebody on here might.
Back to your original question - anybody?
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mc18 F3, mc21 300, mc21ish sp, mc21/28ish.
cbr929, RC30, tdr250, rvf400, wave, gyro, joker.

I use NX5 pistons in my race bike. They are shorter, so you need to skim the cylinder height down to suit. Its a lot of work. An easier option is the 90s RM125 motorcross piston which is very similar to the NSR and a lot chaeper than an NX5. See a thread on this in the main discussion section of the site.

On the A kit piston, the ring peg is at the rear of the piston rather than off set. As Kieran says, it runs over the rear transfer port itself. This is possible as the A kit piston uses a very thin ring (0.7mm) so is flexible enough not to snap like the more rigid 1mm standard ring.

David19 wrote:I have bought nx5 pistons, flat and rounded.
I also have some kit pistons. Not sure why they are different?
I also don't own a nx5
I think they are considerably different in height to the nsr. The nf5 I hope are good for the F3 because I have loads and yet to check.

Standard NX5 pistons are no good in an F3.

NF5 pistons are also different to F3 ones.
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If I have to take the carbs off once more...

I know the nx5 pistons are no good; I always buy parts when cheap for motorcycles I wish to own in the future. I didn't mean to buy the kit ones though.
I did think the F3(89) pistons were a nf5 part number. Wasn't sure if they were different than the nf5 piston nf5 part number.
All adds to the excitement if they don't fit.
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mc18 F3, mc21 300, mc21ish sp, mc21/28ish.
cbr929, RC30, tdr250, rvf400, wave, gyro, joker.

Is that "the excitement" as the rear wheel locks mid corner on part throttle?"
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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.

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Never happen to me, I'm Buddhist.
Do good get good.
Anyway, I go round corners that slow; the bike is nearly upright
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mc18 F3, mc21 300, mc21ish sp, mc21/28ish.
cbr929, RC30, tdr250, rvf400, wave, gyro, joker.

David19 wrote:
Anyway, I go round corners that slow; the bike is nearly upright

That does it then... We'd definitely get on OK!
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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.

Check us out on Facebook! Please "like" our page!

Why not come to Pattaya bike week and we could have a slow motorbike race?
You could even help a certain person finish my crankcases.
Without starting another thread, anybody else coming to Pattaya for the Daytona beating bike week (pretty similar but no fat chicks allowed).
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mc18 F3, mc21 300, mc21ish sp, mc21/28ish.
cbr929, RC30, tdr250, rvf400, wave, gyro, joker.