2017 KTM 250sx light freshening up

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11/25/2021 8:23 AM
Edited Date/Time: 11/27/2021 2:53 PM

Picked this up yesterday as a potential replacement for my 2007 Kawi KX250 smoker. (original thread asking for feedback on the '17 250sx here)

This bike has 113.4 hours on the meter and a number of rough spots, such as dented pipe, road rash plastic, and bent footpegs. Engine runs strong, though it's going to need jet work - very rich on bottom with tons of smoke.

These are the before pics. She will look quite a bit different by the time I'm finished with the build.

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I've owned four KTM four strokes, but this is my first Katoom two-stroke.

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

11/25/2021 8:25 AM

Running fuel out of the carb before putting it in dry storage for a bit.

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

11/25/2021 8:39 AM

One thing I'm a little confused is the forks. I thought the 17's came with AER forks, but I'm unclear if these are actually AER forks..

Can anyone confirm what they are?

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

11/25/2021 2:37 PM

Yes, those are the original AER fork caps. Left fork has the Schrader valve to adjust air pressure. Right fork has the compression and rebound adjusters.

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11/26/2021 6:33 PM

crawfishoo wrote:

Yes, those are the original AER fork caps. Left fork has the Schrader valve to adjust air pressure. Right fork has the ...more

Do I need the fancy $80 pump to adjust?

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

11/27/2021 12:54 AM

crawfishoo wrote:

Yes, those are the original AER fork caps. Left fork has the Schrader valve to adjust air pressure. Right fork has the ...more

queen of spodes wrote:

Do I need the fancy $80 pump to adjust?

It's a great pump. You can also use a mountain bike fork/shock pump as well. Just needs an accurate gauge to enable you to set the pressure correctly and ensure repeatability.

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CR250 07
KTM 200 2016 EXC (XCW)
KTM 150 2018 EXC (XCW)
Husqvarna TE150 2019
Husqvarna TC125 2019
KX85 Supermini 2014
YCF 125 Bigy 2018

11/27/2021 2:57 PM
Edited Date/Time: 11/27/2021 3:00 PM

Rode the bike for the first time today, got sag set and adjusted shock rebound a bit. AER forks feel weird, not sure how to describe. They didn't feel too stiff or damped too quick or slow - just different from what I'm used to on traditional spring forks.

Super different feel from my '07 KX250 smoker. Still getting used to it.

The engine is stupid fast. It feels noticeably more powerful than my KX250. Good low-to-mid power spread. The jetting on this bike appears to still be stock. It blubbered a lot, and felt very rich. As above I've ordered necessary jet and carb parts to get that dialed in.

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

11/28/2021 9:26 AM
Edited Date/Time: 11/28/2021 3:30 PM

🙃😖
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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

11/28/2021 3:37 PM

Just before a bath

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

11/29/2021 4:21 PM

Holy crap, that filter was nasty! What type of riding are you going to do with it? One tip I learned here for these bikes, there is a little plastic burr on the point of the filter cage that can be sharp and start tearing filters. I used a file to smooth it out on mine.

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11/29/2021 7:44 PM

rollin64caddy wrote:

Holy crap, that filter was nasty! What type of riding are you going to do with it? One tip I learned here for these bikes, ...more

Yeah I felt that burr and will shave it down a bit when I move into my new shop and have all my tools available. Previous owner raced off road, he said he last ran a long race with it. The inside of the airbox was super clean. Inside of that gross filter was also very clean (twin air).

I'm mostly doing practice days at tracks. I doubt I'll do much off road work with this bike, but that's an option.

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

11/29/2021 7:57 PM

Installed new jetting tonight based on option "A" from AJ's jetting thread:

Main jet 500
Pilot jet 32.5
Slide 5.75 (Kawasaki part#16025-0003)
Needle 43-75 (KTM part #55431134400)
Clip position #2
Needle jet S4 (KTM part #55431021400)
Air screw 1.5-2.0
Fuel 55:1

This bike still had the stock jetting, which is blubbery down low. Hit up AJ's thread linked above if you have comments about jetting as I am relying on his expertise here.

Reinstalling the carb was actually easier than removal. I started by putting the bell end to the airbox boot first, then eased the intake side to the manifold. I also have the updated jet block gasket kit coming, but it won't be here till next week and I gotta ride this weekend 🤠🤘

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My poor KX250 feels a little nervous with its replacement hanging out right next to it...
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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

11/30/2021 7:03 AM

I had an 18, was one of my best bikes recently…. An Xc gas tank fits right on & allows for longer races, GNCC ect. I replace my grips & throttle tube at regular intervals on my Ktm”s, they sell the complete kits OEM”s, comes with new throttle tube, grips & 3 throttle cams… 2 for the 4t & 1 for your 2t. If your throttle pull feels hard, it’s the throttle cable, they are a little pricy but a new cable will bring back the light feeling throttle. If you are not a high rpm revver, be prepared to drop the main ….. These guys have the jetting pretty dialed but I was never able to pull more than a 460 main….

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11/30/2021 8:23 AM

I low key hate the oem ktm grips, ordered a plain tube so i can install pro-taper pillow top grips

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

11/30/2021 11:58 AM

🤔
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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

12/2/2021 11:39 AM
Edited Date/Time: 12/2/2021 11:40 AM

Your front brake hose needs a little reset in one of the pics. Loosen the banjo and spin the hose a little.
I used a Domino throttle (off a pre-2015) on mine and that made the pull quicker and lighter. I found the stock housing wore out at around 60hrs with some pretty severe scoring inside the housing against the throttle wheel. You might find a 2021 throttle would work well too.

The 2017s have the issue with breaking cases ... you'll need to mind how you kick it and drill your idler gear bolt a little deeper if you haven't done so already. Try and find out if your bike has been fixed under warranty. Ask the PO or run your VIN at your local KTM dealer.

I ordered the Raptor copy (steel) pegs for mine, and they are pretty good value at about $150. The bike will definitely need a good service at 100hrs with hydraulic fluids, grease, etc. They are awesome bikes and Pro Circuit work really well, too.

Don't think twice about selling your KX. These 250sx are AWESOME once dialed in.
I rode a borrowed KX250 for one race on a weekend when I blew up my 2011 KTM 250SX. Sheesh, glad I'm on orange!

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KTM250SX YZ125 YZ85 PW80 ZX6 FZX700

12/3/2021 5:16 PM

This pro circuit works pipe almost fits. Almost. Do they only match up with pro circuit silencers? Photo

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

12/4/2021 9:13 AM

My 125s PC pipe will mate to a stock, FMF, or PC silencer with no problems. Can't imagine it being different on a 250.

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Unleaded tastes a little tangy. Supreme is kinda sour, and diesel tastes pretty good.

12/4/2021 3:22 PM

Are you sure it's not a 19+ pipe? Or one off a 16 or older?

On 2018 125, fmf and pc compatible with stock....just about, the aftermarket stuff never fits as perfect as oem.

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12/4/2021 3:56 PM

The numbers on the pipe match up with 16-18 250sx. Idk, it's in the cylinder all the way, tried rotating either way to get either of the two mounting brackets closer but no dice. The bracket near the bottom front of the engine was closest to fitting, but it was about 1/4" off lengthwise (rotating that bracket wouldn't matter due to being too short).

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

12/4/2021 8:28 PM

That's the 19+ pipe. The rearward pipe mount attaches to the engine hanger.

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12/6/2021 3:28 PM

Still waiting on wheels and seat but

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

12/6/2021 3:29 PM

Matt Fisher wrote:

That's the 19+ pipe. The rearward pipe mount attaches to the engine hanger.

Can you share a pic of your pipe at the rear mount, and also the number stamped on the label?

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

12/6/2021 8:00 PM

I don't have a 19. Both my 125 and 350 are 17's, but do a quick search for 19 250SX and you'll see the pictures showing the rear pipe mount attached to the upper engine mount.

I started paying attention to the pipe mount of my 125, it cracks the forward pipe bracket all the time.

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12/7/2021 7:51 AM

Matt Fisher wrote:

I don't have a 19. Both my 125 and 350 are 17's, but do a quick search for 19 250SX and you'll see the pictures showing the ...more

That's really interesting, I've got 2018 125 and 150. Both have cracked pipes at the welds on the center cone near the bracket.
I attributed this to the FMF pipes fitting so poorly and just fitted the stock pipes.

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12/8/2021 7:46 PM
Edited Date/Time: 12/8/2021 7:47 PM

New Guts seat came today (not bolted down in the pics)

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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

12/8/2021 9:53 PM

Matt Fisher wrote:

I don't have a 19. Both my 125 and 350 are 17's, but do a quick search for 19 250SX and you'll see the pictures showing the ...more

Bruce372 wrote:

That's really interesting, I've got 2018 125 and 150. Both have cracked pipes at the welds on the center cone near the ...more

I have two stock pipes and two FMF pipes, all of which crack at the forward mount in one way or another. The OEM pipes tend to break at the 90 degree bend where it bolts to the frame bracket, whereas the FMFs tend to crack on the pipe itself, where the bracket is welded to it. That crack can quickly migrate and turn into more of a "blowout", and the FMFs will also self-destruct in the stinger area too. I don't actually think it's a FMF thing, as I've used their pipes on a myriad of other bikes with good results.

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12/9/2021 5:25 AM

Matt Fisher wrote:

I have two stock pipes and two FMF pipes, all of which crack at the forward mount in one way or another. The OEM pipes tend to ...more

All my 300”s & 250 ktm 2t”s crack at that mount, I reinforced the hell of of my front mounts. When I raced off road I had 3 pipes in rotation, either getting welded or dents blown out, it’s just part of the maintenance routine. My 96 CR 250 pipe cracks at the same forward mount all the time….

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12/13/2021 6:33 PM

Old foot pegs were trash got some new Evo ext's installed these are steel pegs not aluminum
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Ride like a girl!!!
Insta queenofspodes
2017 KTM 250 SX build thread
2016 KTM 500 EXC-F
Current project: 2007 Kawasaki KX250-R7 retro build
Current project #2: 1987 Kawasaki KX250-E1 rider/racer resto
1989 KX125 resto
1987 RM250 resto

12/13/2021 10:01 PM

Looks great!

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