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kx125 made into 144, as much hp as ktm 150sx?

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Im looking into getting a kx125 probably 04-06 then sending the engine out to have it made into a 144. Any good guys out there that could do it? will the 144 build make as much hp as the ktm 150sx? Should i just save up a little more money and wait for a ktm 150sx to show up. Im a short rider so whichever bike suits a smaller rider would be better

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Eric Gorr is the man, but I doubt you'll be anywhere near 40hp like the 2011 KTM 150SX.

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So there is no way to get the kx to make that much hp? Im looking to make the bike desert ready for some races in nevada

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You can so just about anything with enough money, but it would probably be a really high maintenance machine. What's wrong with a KDX200/220? Those are absolutely great bikes and have a very friendly seat height.

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You can so just about anything with enough money, but it would probably be a really high maintenance machine. What's wrong with a KDX200/220? Those are absolutely great bikes and have a very friendly seat height.

I think the OP is looking for a SX bike.

Has anyone dynoed a Eric Gorr KX144? I bet it is close to 40hp.

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I know it's not a Kawi, but this article isn't very hp inspiring...

http://motocrossactionmag.com/Main/News/TWOSTROKE-TEST-MXA-BUILDS-A-YAMAHA-YZ144-BIGBORE-M-6889.aspx

I stand corrected. On the yz 144 only 2hp increase over the meat of the power band.

The Mag even states it is not even close to a ktm 150 hp and trq numbers.

I wonder what a EG KX 144 hp and trq numbers would be?

Thank you for posting that artcicle

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I think that a 144 2 stroke can beat a 250f, the 250f still may have more HP but take into consideration that the 125 is 30 lbs lighter, and the fun factor is a major plus!

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hmm maybe my future looks orange? I know even the 2012 makes about 38 hp. The one thing i dont like is how much my 250f weighs, it feels like a pig!

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First off, the KTM150 IS A 144, they just use 150 as a marketing thing.

2nd, Absolute peak hp isn't the key to everything. The key is putting the power in the area the rider rides at.

i.e. A pro rider will want all hp at the top where he is at all the time. A novice rider will want it at the midrange, etc, etc.

EG and TDC both do some of the best work out there as well as a few others. They will all build and design the engine based on riders abilities and type of riding...woods, mx, etc.

Horse power is great, but not worth a damn if you can't use it or get it to the ground in your usable range.

Oh, BTW, a 144 is a jetting nightmare.

143.6cm3

Also, ride a KTM before you buy one. All the Euro bikes have a completely different feel to them. Closer seat to pegs, bar placement, etc. Personally, I don't like the feel of them.

Edited by SAPPERS

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First off, the KTM150 IS A 144, they just use 150 as a marketing thing.

2nd, Absolute peak hp isn't the key to everything. The key is putting the power in the area the rider rides at.

i.e. A pro rider will want all hp at the top where he is at all the time. A novice rider will want it at the midrange, etc, etc.

EG and TDC both do some of the best work out there as well as a few others. They will all build and design the engine based on riders abilities and type of riding...woods, mx, etc.

Horse power is great, but not worth a damn if you can't use it or get it to the ground in your usable range.

Oh, BTW, a 144 is a jetting nightmare.

143.6cm3

Also, ride a KTM before you buy one. All the Euro bikes have a completely different feel to them. Closer seat to pegs, bar placement, etc. Personally, I don't like the feel of them.

Im goint to use it for desert so wouldnt i want most of the power up top? Then again the races have parts where you start to slow down and have to go up stuff carefully. So if i look for a kx125, which years should i look for? Any other good brands and years that you've tried?

Edited by onetwofivelife

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So ive been looking and maybe a smaller bore 2 stroke isnt the answer, the other problem ive had with the 250f is it feels like porker, me being 5'6'' and 130 lbs at times i slide out and cant catch myself like i could with the old 125. Thats the reason i want 2 stroke. I was thinking if not a 144 then maybe a ktm 200 or even ktm 250sx, but then http://www.ktm.com/e...highlights.html the one thing i dont like about the 200 and 250 is they weigh 13-15 lbs more than the 150sx. Where does all that weight come from? Just the bigger engine? Heres a video of one of the races so you guys can see if I might need the extra power http://www.youtube.com/watch?v=LEWgR5StKak

Edited by onetwofivelife

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You're not near to using the full HP of that yamaha - I bet you'll be disappointed in a lighter bike with a shorter torque curve.

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I didn't read the entire thread, but I have owned a ktm 144sx and an '04 kx125 with a 144 done by Gorr ported for mid to top, stock pipe, shorty silencer, vforce 3 reeds. It felt really close to the horsepower of the 144sx, and what made it even more ride-able was that it had great mid-range. I bought it with the head modified for pump gas, but I had him bring it back to stock form, and the only power loss I felt was a little off the bottom-end. In the end, both bikes could handle most any 250f if kept on the pipe. The KX was a little easier to ride, and it absolutely ripped (I'm not a kawi guy either!).

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You're not near to using the full HP of that yamaha - I bet you'll be disappointed in a lighter bike with a shorter torque curve.

oh no thats not me in the video haha just a video i found on youtube. I was talking about how fast they're going and things they go over if its a dumb idea to go to a 125 or get maybe a 200

I didn't read the entire thread, but I have owned a ktm 144sx and an '04 kx125 with a 144 done by Gorr ported for mid to top, stock pipe, shorty silencer, vforce 3 reeds. It felt really close to the horsepower of the 144sx, and what made it even more ride-able was that it had great mid-range. I bought it with the head modified for pump gas, but I had him bring it back to stock form, and the only power loss I felt was a little off the bottom-end. In the end, both bikes could handle most any 250f if kept on the pipe. The KX was a little easier to ride, and it absolutely ripped (I'm not a kawi guy either!).

were you racing mx though?

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oh no thats not me in the video haha just a video i found on youtube. I was talking about how fast they're going and things they go over if its a dumb idea to go to a 125 or get maybe a 200

were you racing mx though?

Yes, I did some racing and trail riding with both of them.

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how was it in the trails?

The 144sx was ok in the trails. Not too difficult if you don't mind using the clutch a little, and would be easier with a 13T front sprocket. The kx was really good for being a small-bore 2 stroke since it had more mid-range.

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