2019 KTM 250SX Must do's?

sandman768
Profile picture for user sandman768
Posts
8167
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3/21/2014
Location
Saratoga Springs, NY, USA
sandman768 3/28/2019 6:48pm
3/28/2019 6:48pm
I have an 18 with 45hrs on it...37.5 pilot...5.75 kx125 slide..450-470 main depending on track & temps. Stock needle & clip position. Fmf factory pipe with powercore silencer. 49 rear sprocket...50/50 non ethanol & Sunoco 110 leaded, 50:1 amsoil dominator. bike absolutely rips...have not even done a top end yet, sounds tight as day I bought it...
Mattshredsgnar 6/23/2022 11:29am
6/23/2022 11:29am
AJ565 wrote:
The jetting we’ve figured out for the ‘17-‘18 also works well on the ‘19 since it come rich too. Needs a pipe and silencer for more...
The jetting we’ve figured out for the ‘17-‘18 also works well on the ‘19 since it come rich too. Needs a pipe and silencer for more over rev and drop a tooth in the rear. I also run straight u4.4 as it was a noticeable power increase over C12.

Chassis wise a rear link and a steering damper help a great deal. The forks still benefit from a revalve.
Hey Aj, what do you think about RaceTech Gold valves on the stock WP AER48. Have you tried it?
AJ565
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3/12/2012
Location
San Antonio, TX, USA
AJ565 6/23/2022 1:26pm
6/23/2022 1:26pm
AJ565 wrote:
The jetting we’ve figured out for the ‘17-‘18 also works well on the ‘19 since it come rich too. Needs a pipe and silencer for more...
The jetting we’ve figured out for the ‘17-‘18 also works well on the ‘19 since it come rich too. Needs a pipe and silencer for more over rev and drop a tooth in the rear. I also run straight u4.4 as it was a noticeable power increase over C12.

Chassis wise a rear link and a steering damper help a great deal. The forks still benefit from a revalve.
Mattshredsgnar wrote:
Hey Aj, what do you think about RaceTech Gold valves on the stock WP AER48. Have you tried it?
I never tried them. I talked to a local suspension guy about them and when I was asking questions he would read word for word off race tech’s site about stuff so I knew he wasn’t my guy. I did get mine revalved and they were better, but I went with cone valves soon after. The ‘22 forks that came on my 350 are way better tho so I don’t know if they can update the older forks to what’s in the new ones, but that would be a big step in the right direction. Also if they can ask them to valve it for a 350. It’s different then the 2 strokes, 250, and 450 4 strokes and works very well on my 250 2 stroke.

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