More power from NSR???

[Farmingstock]

Just looking for options to take the bike to the next level

Current mods:

Full stainless tyga exhaust
36mm pwk carb
RS 125 inlet
Ram air filter
Boyeson duel stage reeds
Ported barrel
Race spec clutch plates and springs

Had the bike rolling roaded with a different exhaust and standard reeds and it was just over 26hp, feels faster now so I presume it’s higher up now.

Although I want to take the bike to the next level, it’s stripped back and all weight that can be removed has been!

It’s more of a toy used on a private road/track but want to know what my next options are???

[c_dug]

Surprised it only hit mid 20's with all those mods. I know they weren't the most powerful of its peers from scratch, but in my head I always figured they'd be in the low 30s with that sort of tuning.

I'm no tuning guru, but I'd think the next stages would be skimming the head to up compression a bit, then maybe looking at reducing reciprocating mass in the engine (lightened flywheel etc...)?

In the end it'll only go so quick at 125cc. There's no replacement for displacement!
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[Farmingstock]

Yeah I was surprised it wasn’t more! But think some rolling roads make the readings higher for bragging purposes! But the place I went to had just been calibrated and they knew what they were doing.

I have a spare head and flywheel, I couldn’t find any one online that had recommendations.

Surely there are other things tho as the RS 125 is a completely different animal also race 125’s must have other tuning??

[Ste]

Private road or track?

They make more than that as standard when derestricted so I'd be looking to address whatever is sapping power.

I'd probably get rid of most if not all of those mods.

[Farmingstock]

Yeah my username may give away why I have access to a private road! Ha ha ha they definitely don’t make that just derestricted as mine is an Italian import and derestricted from the factory! I can absolutely without a dowt say that the bike is quicker with the mods!

[Ste]

Yes, they do make that much derestricted.

Have you had the fuelling setup for all those mods?

[MarJay]

[Farmingstock]

Ha ha ha Again they don’t make that just derestricted! As mine was derestricted when I bought it! Fueling was set up on the dyno!

So now we know the facts, back to the original question next step modifications??

[Ste]

You can continue telling yourself that they don't make more power than that when derestricted or you could investigate why yours is down on power.

A mates had 27 or 28 bhp when tested and that was completely stock apart from being derestricted.

How many horsepower did yours have before you did all those mods?

[stevo as b4]

I agree with Ste, that it should have been ok as std as an unrestricted Italian import. But there's lots of versions, specs and different parts used. Look at how many different NSR CDI's and methods of restrictions used on them. I can't remember if Honda Italy claimed 26 or 28bhp (crankshaft figure), but low-mid 20's should have been about right at the tyre.

Your spec has loads of intake and fueling mods, but little details on what else has been done? Who did the cylinder mods, and what exactly was done? And where did they aim at in the Rev range for improvement?

Does the Tyga 150cc spannie actually work as well as std or better on a 125cc though? I'd want proof that it's capable of delivering a good curve on the NSR 125 before I'd pay good money for one.

If the pipe is any good, the next thing you want IMO is a programmable ignition and a couple of £££ spent at the dyno with a tuner that knows how to program it, and more importantly understands two strokes. If you go to any local generic dyno centre that just likes to quote happy numbers it'll be wasting your cash and time.

You've got a big carb probably too big, and plenty of air assuming your open filter is big enough and better than the airbox (unlikely). The electronics is where unlocked potential lies and it's likely to make much more difference than your other mods too.

Lastly you can't really look at two stroke tuning as bolting on a number of different parts all as upgrades that will work perfectly together and add performance with every bit you change. You need to look at it as a whole as changing one thing will affect everything else, and that's where having adjustability in stuff like ignition timing, power valve control and power jet switching is vital when you tune a bike or change it from standard.

[-]

I have a full power NSR125. If I want more power, I’d ride one of my 250 Yam strokers.

I’m not sure if the recknowned Honda reliability will be there if you push it further.

If you wanted to push it though a custom spanny and full
Circle crank would help. You could also skim the head a bit and O ring it as a head gasket.

A bit of dyno time to get jetting right would help too.
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[Farmingstock]

I knew it was gonna be your mates bike bet it wheelies in 4th too they are 11hp as standard, 14hp with intake and exhaust restrictions removed.

A Honda RS 125 full blown race bike will make 30/31 hp! you are absolutely delusional if you think a de-restriction will make an Nsr 125 anywhere near that!

Mine was 26hp at rear wheel with all the mods after being tuned, jetted correctly, on the Rollers proven, factual, not make believe or guesstimations coz “me mate said it was“

So as far as tuning goes and my actual question flywheel, head, ignition??

[Ste]

Found old posts about it and it was dynoed at 23.7bhp.

[Farmingstock]

Must have had a different pipe on it and maybe reeds etc, unless that reading was from the flywheel which would explain it

[Ste]

Narp, it was the standard UK model and the reading was from the rear wheel.

[MarJay]

F*ck sake... Kids these days eh?

Leave the bike alone, go and buy a faster 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.

[Ste]

It's a race bike toy used on farm tracks, we're too old and boring to understand such things.

[stevo as b4]

Sounds like he's been to Shiny Red's dyno, the one that reads magically lower than any other Dyno Pro unit, and apparently is the only one that's not delusional and gives the truth.

If the kid wants to waste even more money on his Honda hand grenade, a £200 ignition CDI unit is the way to waste it.

CRM 250cc engine transplant? Keeps it all Honda and it's not a vibration city frame cracking MX motor. That's where I'd waste my money if I was forced to.

[Farmingstock]

Honestly you lot give adults a bad name! 40 year old kid Hey!! I have a cr250 for the field but don’t have a bike liecence or cbt as previously stated it’s a bit of fun for a private road, can anyone actually read???

I like the old two strokes and just mess about with it to take my mind away from work, etc!

You lot are hilarious, especially Ste with his imaginary bhp didn’t want to get into a my mates bikes got more bhp than yours and it’s standard now that sounds childish so I’m sure your the kid!!

Stevo is the only one giving advice to the actual question, looked into ignitech and am waiting back on an email!

I’d buy a bigger bike something like rg250 etc but I have about as much chance of getting one of them for decent money as Ste has of actually reading a post!!

[redeem ouzzer]

A standard Full power NSR on a reputable dyno does about 22bhp at the wheel. Looks like you’ve covered most bases but get the squish set at about 0.9mm for more power everywhere.
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[Farmingstock]

Thank you GTfan any recommendations where to get machining done I’m based northwest but wanted to find someone to do the head and flywheel

[G]

[Farmingstock]

Again off topic but official stats from Honda site say different

https://world.honda.com/HRC/products/machine/rs125r/spec/

[G]

[Farmingstock]

This is the kinda performance I want tho

https://m.youtube.com/watch?v=Wd-JFD8Jg48