I'm getting close to pulling the trigger on an engine rebuild and wanted to know what would you guys do if you were going to rebuild your engine. Would you use the RM or OEM?

I have searched and read the threads and it seems as if the RM still might not be a fully tested option.

Also front brake rotors. Are aftermarket available? Or is OEM the only choice.

Thanks guys.

OEM... or F3!
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Andy.
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Andy wrote:OEM... or F3!

Come on Andy give me more than that.

From what I've read F3 isn't an option for me.

Why not the RM, just because or something more technical.

It depends what you want out of the motor.

I am quite confident my next motor will make 70hp on OEM pistons, and go an awful lot longer between rebuilds than any single-ring piston motor.

Use single-ring pistons if you want to disassemble the motor every 200 miles (or sooner), and you want that last 1hp/500rpm.
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Andy.
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So, what's the secret to a reliable 70 gee gees Andy?

Single rings seal effectively at high rpm, but not so good at low rpm. They offer less friction than a twin ring design, but also wear quickly if the ring is thin.

The OEM pistons are not a disaster, and they have long life, but if you're like me and OEM stuff leaves a bad taste in your mouth then fit the RM (or whatever) pistons. They won't be an easy plug and play, so be prepared for some cutting here and there.

If you want an easy life then fit the OEM stuff.

Matt@TYGA wrote:
So, what's the secret to a reliable 70 gee gees Andy?

If you want an easy life then fit the OEM stuff.

Yep... all I want is an easy life supping Blue Cruisers in the company of several dayglo green bikini-clad shorties under UV light, with pumping tunes in my ear!!

I can't tell everyone the secret of my reliable 70hp motor Matt, as I would hate to damage my reputation on other Forums by releasing any kind of useful information!

I just don't think single-ring pistons are worth the hassle for 99% of the time, and 99.99% of the population. Mind you, it's easy to say that when I already have 2 motors with single-ring HRC pistons! A third motor would just be irrational, especially as it is going in my every (sunny) day ride.
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Andy.
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Thank you both that's the info I needed.

I run my '18 with OE pistons and the F3 with, er F3 pistons. If you did want to run the F3 pistons though you could run the long skirt ones which do help ring life.

Either long or short skirt F3 pistons will require the barrel to be machined though to get the best from them. However thats the same with OE pistons if you want to be picky.

The single rings dont last too long though and I'm replacing mine, as Andy says, around every 200 miles. You can feel the engine running freer and freer as they wear. The instant you put a set of new rings in it it feels like you've got another 5hp back.

If it was a track bike thne its easy to whip the cylinders off and change, but if its a road bike I woudl be sticking with the twin ring OE ones.
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If I have to take the carbs off once more...

StephenRC45 wrote:
If it was a track bike thne its easy to whip the cylinders off and change, but if its a road bike I woudl be sticking with the twin ring OE ones.

That was going to be the addendum to my post!
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Andy.
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They won't be an easy plug and play, so be prepared for some cutting here and there.

Mine were, went straight in? did i do somthing wrong? I use mine on the road every day and am guessing i have got about 5000 kms out of them, admitedly they are very tired now and need replacing but it not a very hard or expensive job cost me $60 aus dollars and take me 2 hours and im set for another 4 or 5 thounds k's. Id run the single ring ones, there cheaper and give you so much more over rev, i gained 1500 rpm at the top on mine.
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Hesitation is Fatal!!

What's the pin to crown measurement? And the shape of the crown? Identical to the NSR?

No good having and extra 1500rpm if the compression ratio is incorrect (could just be low compression allowing over-rev) or a poor mis-match between crown shape and combustion chamber.

Great if the RM pistons are a direct replacement, but I would be shocked if they are. Even the OEM barrels, heads, and pistons need optimising for best performance, and they are manufactured to work together.
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Andy.
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i can understand peoples concern about these single ring pistons however ive now completed 900miles with mine. im gonna replace the ring and little end as a matter of course at a 1000 miles. my bike has some massive ports, race cans with mc21 front pipes and foam filters. it made 67hp which aint bad. im gonna try a thinner base gasket and get another run done.
the piston goes straight in and is compatable with the barrel (wiseco's words)
its slightly lighter than f3 piston
£20 cheaper than standard piston kit.

so as far as i can see there no disadvantages as long as you dont mind swaping rings abit more often (there only £7)

everybody would like the hrc kit, and i know a few of you guys have it but to us mere mortals rm kits are the way forward!!
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wadda ya mean its too fast!

If nobody tries we would never know.... good on ya.

Not going to play "mine's bigger than yours", but mine has made more than 67hp on OEM pistons and stock porting, and will do considerably more than 1000 miles before needing the top-end to be pulled.

Nothing wrong with what you guys are saying, but in my opinion you haven't found the Holy Grail of cheap, long-life, lightweight, single-ring pistons... there is no such thing. Yes, the RM pistons are initially cheaper, but if you have to replace them twice (at least) for every set of OEM pistons, and the ring 3 times (at least) as often as OEM rings, then ultimately they are more expensive... and performance is ALWAYS ultimately MORE expensive.

Bear that in mind when choosing.

I say that if you have 2 NSRs (or more!) then build one that's all singing all dancing, with single-ring pistons, ported to hell, with pipes and a trick ignition, and keep one that will run almost forever, as you'll soon get pissed off pulling the top-end! We all love spannering now and again, but it will soon start to become monotonous when you are spending more hours replacing bits than hours riding.
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Andy.
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i agree with that, if its your only form of transport keep the standard kit. i use a tl1000 for work every day so the nsr only comes out when i wanna whop some 4 stroke ass!
as for mileage of the pistons i have no idea how long they'll last. but like i said im just changing the ring just to make sure.
5 year ago when i bought my first nsr250 i thought id use it for everyday use but it was hard work keeping on top of it. sometimes i cover 400 mile a week at the mo. which would be too much for the nsr. having said that theyd be fine for just general commuting.
as for the power of the bike andy sure theres more ponies in there but my bkes a bike of an experiment, ive been trying to build it using other bike bits to uprate it. im gonna call it frankeinstein!!
06/07 r1 shock
cbr400 swing arm
rs250 yokes
cbr600rr calipers
bbs rear wheel. front wheel will be fitted in the next week or 2 when ive finished making the spindle for some aprilia 06 rs125 forks. once the rs forks are fitted i'll have a trick front end up for sale.
it'll be certainly different when shes finished
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wadda ya mean its too fast!