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2018 sx150 Dyno results

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So I recently got a 18 150 after 13 years of 250f

 

Just for fun I had it on the Dyno as it's cold and wet here and no fun to ride

 

So here's the good news

 

Jetting was very close ,one needle clip leaner and one main jet richer with STD pipe

 

The map switch makes a decent difference,more aggressive is just that

 

Reed block ,zero power gain from v force ,it was a loss until it had leaner jetting to suit

 

Mainly done for reliability,one reed had a small gap

 

Pipes were STD ,hgs and FMF factory fatty ,the FMF was a clear winner ,more power everywhere, the hgs was pure top end screamer ,no midrange power

 

The STD was a good compromise with only lacking overrev ,STD needed richest mainjet

 

The mukuni carb holds the engine back in the midrange by over 1 hp compared to the 16.

 

STD squish was too wide at 1.5mm but I wasn't going to start taking cylinders off a brand new bike

 

Tuner says the engine has a another 1hp with a squish at say 1.2mm

 

And another 1 hp from kehin carb but I really need to ride it and stop spending lol

 

Dyno is showing STD pipe Vs FMF

 

IMG_20180127_153942525_HDR.jpg

 

 

 

 

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The power is really wide for a 2 stroke ,much wider ( mostly top end ) compared to the 15 150

 

My 2001 signed off at 10.5k

 

For comparison a 17 125 has around 33-34 hp

 

And older 125 like a,2012 has 32

 

 

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If i where riding for fun the 150 for sure but for points the 250 all day.

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If I weighed around 180 I would be racing a 150. No lie.

 

My brother had a 15 150SX and I got to compare it to a built RM144 a few years back. The 150 was faster, yet had a broader power band. Would love to spin some laps on a new 150.

 

I have an 08 YZ125 that is just begging me to send it's cylinder to Derek at HPbikes, but we'll see, needs a revalve first.

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One thing to note , in terms of fueling the 18 was real close ,probably better than older bikes , it may not be the best carb available but to spend 100s replacing it is crazy unless you have huge swings in elevation and temperature,one winter setting and one summer for most is easy to get.

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Another one

All STD Vs modified IMG_20180129_151928327.jpg

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received_1986244188325401.jpeg

Green stock pipe, blue van hasselt pipe, red hgs pipe ktm 125 sx 2018

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IMG_2691.JPG
This is over 40 HP on a ‘17 150 XCW. I took it to .6mm squish and it needs race gas. This run is with a Kehein Carb, the jetting isn’t quite sorted here as you can see, but it is almost a full horsepower more than the Mikuni. I have the Mikuni back on now, it may not have the peak Horsepower, but it does run better in this configuration.

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I want to get a keihin and stic but the prices make the bike as expensive as a sxf !!

FB_IMG_1519652534176.jpg.10c0fda5625765c02de1fecd84835d35.jpg

Ktm 125 sx 2016 STD vs ktm 125 sx 2018 (Full mod)

Come on let us know the spec ,that's impressive

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received_1986244188325401.thumb.jpeg.a5c8c79cb49e65b8f71cfc795e66a038.jpeg

Green stock pipe, blue van hasselt pipe, red hgs pipe ktm 125 sx 2018

It appears the hgs is much better on the 125 than 150
IMG_2691.thumb.JPG.ab513f717f55f03a1dff915596e39b11.JPG
This is over 40 HP on a ‘17 150 XCW. I took it to .6mm squish and it needs race gas. This run is with a Kehein Carb, the jetting isn’t quite sorted here as you can see, but it is almost a full horsepower more than the Mikuni. I have the Mikuni back on now, it may not have the peak Horsepower, but it does run better in this configuration.

Is 0.6mm squish safe ?
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Is 0.6mm squish safe ?

It’s working well for me with 100 octane race gas. No issues whatsoever and it has such instant throttle response.
I’m sure many would not like going this tight, but the Banshee drag racers often go zero squish. This leaves no slop for a bad crank or piston pin bearing, but after seeing how hard those guys run, .6 seemed conservative.

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Ive tried 0.80mm squish on my 125, was very responsive etc but gave up too much on top, im at 0.95mm now. Hgs is best pipe for the 125.

The tuned 125 is a friend of mine who is a tuner...

-ported and polished cylinder
-custom head insert with 12° piston
- custom ignition cuve
-hgs pipe/silencer

And thats about it really, 98+ some octane booster.

Thats power at the crank mind..

When everything is tested and married together on the dyno you can get some impressive results.

The key is dyno testing really..

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It doesn't matter crank or wheel hp ,the gain is all I look at , that's serious gains

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12 hours ago, JoeKtm2 said:

Ive tried 0.80mm squish on my 125, was very responsive etc but gave up too much on top, im at 0.95mm now. Hgs is best pipe for the 125.

The tuned 125 is a friend of mine who is a tuner...

-ported and polished cylinder
-custom head insert with 12° piston
- custom ignition cuve
-hgs pipe/silencer

And thats about it really, 98+ some octane booster.

Thats power at the crank mind..

When everything is tested and married together on the dyno you can get some impressive results.

The key is dyno testing really..

with all that work what does it  put out at the crank? 

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Jetting helped alot, with a 440 main jet he got it up to 46.5hp...

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That's again impressive

Any issue with detonation?

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That's again impressive
Any issue with detonation?


Thats a safe curve no detonation, with a 440 main it made 46.5hp... But was risky.

Was 4 hours work on dyno and 1.30hrs on track testing though..
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