Ktm 150 power characteristics

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2/23/2019 8:57 PM

I’ve owned in the past pretty much every brand of 125 except ktm and enjoy riding the small 2 strokes.

I recently bought a ktm 150, I’m struggling with how it has no bottom end it’s really twitchy getting into the power in corners, is there anyway to smooth the power out a little bit to make it more like a regular 125? I know the 150 will have a little more power, that’s not the issue it’s the delivery.
It’s currently standard with full fmf,
I’ve never had this issue with any of the 125s I’ve owned.
Thanks

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2/23/2019 9:55 PM

Have you tried twisting the throttle?

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2/24/2019 6:09 AM

Never had any Problems with no bottom end on my 150 KTM although i weight 90 Kg.
Maybe try a different gearing i use 13/50

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2/24/2019 7:17 AM

What year bike? There has been some issues with sticking power valve arms that could be what you’re describing.

Have you adjusted the power valve screw, that will change where your power hit.

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2/24/2019 7:46 AM

It’s a 2011, havnt changed PV screw. It doesn’t feel like a problem as such it’s jusy on slow tight corners where it’s hard to to keep the revs in the meat of the power it’s hard to stay in ruts as it’s so twitchy, as I said not had this issues with any 125 I’ve had

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2/24/2019 8:17 AM

I have a 2014 150 SX which the same engine as yours. Since you're familiar with 125s, you know how important jetting is.

When I rode the 125 and 150 back to back at a demo day, the 125 had better bottom end and a smoother power spread. The 150 was softer on the bottom and had a stronger midrange. May be the same on the 2011.

One mod that helped a lot was installing a thinner base gasket to reduce port timing and tighten squish height/increase compression. Pretty sure I used a 0.2 or 0.25mm base gasket versus stock. Still ran fine with pump gas. Will reply on Monday with detail (on work PC). Power was much more crisp off the bottom and smoother throughout range.

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