Tools for a big bore?

jp14 · Nova Slayer Joined: 06 Feb 2009 Karma :

I've had my RXS100 for a few months now and I am wanting to big bore it but I'm unsure of how to go about doing it, so I have a few questions:

-Firstly, is it a job I will be able to do relitevly easily?
-What tools do I need to do it?
-How much faster/ how many more cc's will it do with a + 1.50 piston?

Also, if someone would be able to say a sort of step by step guide or give me a link to somewhere that has one, that would be great!

Thanks very much

Vincent · Banned Joined: 16 Oct 2006 Karma :

I wouldn't have thought a 1.5mm rebore is going to make much difference, it's more like a standard rebore that you have done when the bore is worn out or damaged.
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Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Realistically an oversize rebore on its own will probably add next to nothing to the performance. A +1.5 bore would add only 4cc to the capacity.

If you did decide to do it then other than the actual rebore it would be pretty easy.

All the best

Keith
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Vincent · Banned Joined: 16 Oct 2006 Karma :

You could try fitting an expansion chamber, with that, and a bit of carb fettling, you might get it to pull better. Persobnaly, I would spend the money making sure it handles really well, good tyres, and make sure the shock is working well.
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Vincent · Banned Joined: 16 Oct 2006 Karma :

If I remember right from the last time I rode one, for 100cc the RXS performs quite well. if you really have to, you could look into fitting a 125 top end or complete motor.
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jp14 · Nova Slayer Joined: 06 Feb 2009 Karma :

hmmm yeh. I did see another piston on ebay which was +2.00, but as you say that probably won't make much difference either.

Would a better exhaust make more difference do you think? How would I go about making an expansion chamber?

Thanks

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Unless you want to do a load of research and playing around then I wouldn't make one. Micron used to make an expansion chamber for the RXS many years ago.

All the best

Keith
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jp14 · Nova Slayer Joined: 06 Feb 2009 Karma :

Vincent · Banned Joined: 16 Oct 2006 Karma :

I'm afraid you'd need to learn how to weld and fabricate before making an expansion chamber yourself, (you may know how to already, i don't know). If you didn't now, it's just an exhaust system. When designing exhausts for their bikes, the manufacturers have to look at noise, fuel economy, and looks. if you're not too bothered about how noisy it is and if the ike uses more petrol, you can design an exhaust that will make the bike perform a bit better. there are usualy two type of expansion chamber - a race one which normally gives you a lot more power higher in the rev range and one designed for street use where noise restrictions and reliability come into play.
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jp14 · Nova Slayer Joined: 06 Feb 2009 Karma :

Vincent · Banned Joined: 16 Oct 2006 Karma :

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

I've got a Giannelli on my RX-S that I would possibly sell to you.

It may need a de-coke but you shouldn't need to re-jet the carb as I ran it with the standard jet (unless that's because it's coked up to hell).

I'm not sure if it was the exhaust or not but I could only ever get 65mph out of mine, could be once again, because it's coked up but I've never taken it off to have a look because the nuts are a bit rusty.

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Years since I last rode an RXS100, but that managed over 70 on the clocks and was standard.

All the best

Keith
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Blau Zedong · Banned Joined: 26 Jun 2006 Karma :

It's possible to make an RXS batshit quick by porting it, using a 31K YPVS carb and a micron chamber (with a gutted and cut down end can). My mate did this and I rode it. Probably not good for every day use as it might well lead to short piston life as well as the hassle of running premix. A stock RXS is both quick for a 100 and very reliable.
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jp14 · Nova Slayer Joined: 06 Feb 2009 Karma :

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

My went 70, The Micron exhaust is really rare for the RXS.

These guys still sell a brand new one.

https://www.nikonexhausts.co.uk/twostroke.htm

Bit pricey though.
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mikey 2659 · Borekit Bruiser Joined: 25 Apr 2009 Karma :

i tried a micron on mine when they sold them off in m and p for £85 ,sounded nice and tinkly on tickover but wasn't worth the effort.if you go for cc increase do tell your insurer.spend your money on good rubber and oil.all the high milage bikes i ever saw were standard,fit the front end from another bike with a disc brake as front brake crap.i gave the exhaust to my brothers mate,i'll see if he still has it and the jets i got from stan stephens.yamaha and suzuki two stroke commuters were always reliable(6 volt electrics aside)if not played with!!!!!