RXS100 tried and tested tuning?

[NorthantsPete]

are there any tried and tested mods for these? Tried and tested suppliers?

I bought a cone filter for it but now people suggest its not great on these so not fitted it as the jets are standard.

Im thinking a larger jet, cone or standard air filter and adjust the fuel mixture to suite

exhaust wise you can mess with baffles , trim them down or even change to a new exhaust (get loud though)

low down its perky after 50mph i get very little

thoughts? (Apart from get a bigger bike, im practising!)
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No sense but plenty of determination

[Nobby the Bastard]

[NorthantsPete]

That would depend on the person willing to spend that time and money surely.

I have to live with it for the next few months until big bike test time so why not try to make it go a bit quicker if I like to tinker?

Any help appreciated, it is a 2 stroke afterall
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No sense but plenty of determination

[stinkwheel]

Get it running properly in standard form before trying to tune it. They are pretty poky wee bikes. Probably the quickest of the 100cc models.

You should hit 70mph on a standard model. (hit, not necessarily sustain)

So decoke engine and exhaust, check ring gaps and rebore if necessary, plugs, air filter. Maybe new reed valves. If the exhaust has been fucked with, put it back to normal. Run it on top quality 2-t oil. Oil the chain.

Should do wheelies.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[A100man]

RXS100 is an overgrown moped.. Lot s of tuning information here ..
https://www.mopedarmy.com/wiki/Category:Performance_Tuning
BUT you WILL have to invest significant time and energy in getting teh results you desire.
No one is going to tell you to by this jet or file that carb slide or exhaust port, or disc valve. It's hard graft and requires a lot of background reading if you don't want to cock it up.
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Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[mentalboy]

[stinkwheel]

I should also mention when you tune a 2-stroke, you usually steal from Peter to pay Paul. You make the engine have more power but over a very small part of the rev range at the expense of them running like crap elsewhere in the rev range. Many 2t racers won't idle at all.

At the peak of aircooled strokers, if you let the revs drop too low, they would seize, if you let them get too high, they would seize. If you listen to sound clips of them going over the mountain on the IOM when they still had a 50cc class, you'll hear them alternating between wide open throttle and nothing. The riders aren't even looking at the road, they don't need to slow down for any of the corners. They have their head over the clocks watching an exhaust manifold temperature gauge they're trying to keep in the green bit in the middle.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[NorthantsPete]

I guess something like this will give it a bit extra, nto a lot but 15cc is 15% increase!

Then a small upjet, cone filter ive already purchased and away we go

I already run fully synth oil, everything else running nice, and it'll currently do 65, maybe more on a hill (but not found one comfortable to do it)

https://www.ebay.co.uk/itm/Engine-Cylinder-Piston-Kit-54mm-For-Yamaha-RX-RX-S-RXS-115-RX-Spesial-Y-115-F-/133726811832?mkcid=1&mkrid=710-53481-19255-0&campid=5338722076&toolid=10001&nma=true&si=wOSs%252B3JxeMKQyyqS0yFTsfHFMPQ%253D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557
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No sense but plenty of determination

[stinkwheel]

I would fully expect a cone filter on an RXS100 to make it run like a pile of crap. They did quite a lot of work on pressure waves on that bike. It's the one with the now legendary "boost bottle" equipped intake system.

Almost certainly better to retain the airbox assembly, but you can try and find out.

What you have done is the only garaunteed route to more power on any vehicle, which is increasing the engine capacity. "There's no replacement for displacement".
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[NorthantsPete]

yes ive heard the intake is good and they worked hard on this engine

115 i think would be rare over here, but if its just the top end thats different a 115 barrel and bits may be the way to go

anyone know if its the same carb, rarely needs changing air wise... but jets would be bigger i imagine, same carb.
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No sense but plenty of determination

[stinkwheel]

[mentalboy]

[MarJay]

It’s now a classic. I’m sure if you mess it up there are plenty of people who would happily mess you up on the bikes behalf. Ride it or sell it and buy a bigger bike.

If you wanted to tune it as an excercise that’s one thing, but you’ve got the classic “kid with their first bike” stars in your eyes (I don’t care if you are a kid or not!). Every spotty youf with a tiddler thinks they can get another 20mph by making a cut here and a bolt on there. In reality it mostly just makes the bikes shit. However due to chip shop braggadocio, lack of real knowledge, personal pride and not wanting to admit they messed up and threw money down the drain, they will invariably claim their ‘handiwork’ was more than successful. Really if you want to make a 100 go faster, turning it into a 125 is the most reliable way, but then you’ve ruined the originality. Why turn it into a 125 when you can just buy a big bike?
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[stinkwheel]

In fairness, the above is very valid. Pretty much all 2-strokes are going for stupid money where people of my generation are trying to re-live their youth.

Something that is pervasive in this market is people want them as clean and original as possible. An attitude probably as unhelpful as the tune the nuts off it direction because they park them in their living room and ride it to the MOT once a year and spend the rest of the time polishing it and posting pictures on instagram.

However, if you put your energy into cleaning it up and making it as original as possible, not only will it run well, you could also make some money when it's time to change-up. If you get the right buyer after it with their jam-jar bottom nostalgia glasses on, there's no telling what they'd be prepared to pay out for it.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[redeem ouzzer]

Go see Mick Abbey and get him to tune it and make a pipe to suit the tune. Should be able to get circa 20bhp and no penalty in rideability.

VM26/28 carbs fit the standard intake rubber (I’ve seen a choke side carb off a 31K used) and use a foam Ramair filter, not a cone.

It would be a giggle as they weigh fuck all to start with.

There’s a lot of people on here with no 2T development experience will tell you it’s a bad thing cause they come from the world of sticking Microns on 125’s and guessing the jetting.
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Be a REAL MAN!

[Nobby the Bastard]

[redeem ouzzer]

[Nobby the Bastard]

[NorthantsPete]

[MarJay]

Millyard builds bikes for himself and does the odd commission, but he doesn't tune other people's old commuter wrecks as far as I know.
____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Nobby the Bastard]

If you have an rg125 you're better spending the money on that.

You can polish a turd but it's still just a polished turd.

The rg has much more in hand. If I remember correctly, the gamma was good for about 23 bhp as standard with the power valve and factory jetting and exhaust that was sold where the territory didn't have a 125 power limit and the fun was about 32 bhp with the same when that came out.

That was out of the factory. Not even tuned.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[A100man]

[NorthantsPete]

Feast your eyes Paul is in the uk mild tune and chris is in indonesia - far far east they love to tinker ive always got a guy messaging about those expansion exhausts custom made for this bike and india of course.
Jons...is.. well. work in progress!
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No sense but plenty of determination

[A100man]

Well the 'Kenny Rogers' look-alike looks cool, but that looks like it has a basic micron on it, I'd be curious to know it that helps much. The chromed one is not for me.

If you are serious about this and have 400-500 quid to splash on it then Mick Abbey could possibly make you a pipe and see to the head/barrel. No disc valve on the RXS obvs. Ideally he'd want the whole bike up in Teeside to run it on his dyno... unless hes's done one before.

I'm pretty sure he's done YB100 motors for the FS1-E upgrade mob.
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Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[redeem ouzzer]