Back to Two Stroke KTM SX 300

8/1/2020 1:48pm Edited Date/Time 8/2/2020 2:39pm
After riding 125/150 2t from 1999 to 2019 i decided to try a bigger bike at the end of 2019 and bought a 350SXF .
I liked the 350 four Stroke ist was easy to Ride but i miss the Two Stroke.
The Sound, Smell and Most important the Kickstart😂😂

So i start 4 Weeks ago to look after a 250 SX and found this bike in Germany




The Seller quit with MX at 52 years and want to sell the bike in one piece so i get a 2019 250 SX with 300cc Kit- Full FMF and WP Xact Supertrax for 6700€
I change over some parts from the 350 and this is the Final result cant wait to ride it 🤤🤤🤤🤤









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Ovaltine
Posts
17
Joined
3/12/2020
Location
Sacramento, CA US
8/1/2020 2:09pm
That is a nice looking ride! Congrats
ROCKNDAWG
Posts
96
Joined
9/9/2014
Location
Kingman, AZ US
8/1/2020 3:31pm
Very cool bike! Is that the normal or shorty version of the 2.1 silencer? I can never find anything that shows them next to each other.
jeffro667
Posts
348
Joined
12/8/2015
Location
Jackson, OH US
Fantasy
3558th
8/1/2020 4:16pm
Very nice, imo the 300sx is an awesome bike!
5
slipdog
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10043
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7/25/2009
Location
Nor Cal, CA US
8/1/2020 5:01pm
Spoke with your wallet!
1

The Shop

DB505
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618
Joined
12/5/2013
Location
Rowlett, TX US
8/1/2020 5:10pm
Nice!
JMCR250
Posts
274
Joined
8/26/2018
Location
Chesterfield, MO US
8/1/2020 6:29pm
Welcome back to the fold! Nice bike.
8/1/2020 9:23pm
jeffro667 wrote:
Very nice, imo the 300sx is an awesome bike! [img]https://p.vitalmx.com/photos/forums/2020/08/01/441628/s1200_20200727_122118.jpg[/img]
Very nice, imo the 300sx is an awesome bike!
Very clean looking Bike 👍👍
Do you have any usefull advice for Carburator and Powervalve Settings ?
I get 3 different PV Springs
spimx
Posts
1123
Joined
3/25/2019
Location
Port Isabel, TX US
8/1/2020 9:32pm
Damn, nice deal!
8/1/2020 10:24pm
ROCKNDAWG wrote:
Very cool bike! Is that the normal or shorty version of the 2.1 silencer? I can never find anything that shows them next to each other.
I think it‘s the Shorty Version
tek14
Posts
4573
Joined
1/26/2014
Location
Vantaa FI
8/1/2020 10:49pm
6700€ for bike that has 5000€ suspension... pretty cheap.
8/1/2020 11:03pm
tek14 wrote:
6700€ for bike that has 5000€ suspension... pretty cheap.
6700€ for the bike like on the first Picture.
The Cone Valve Fork is from the 350
tek14
Posts
4573
Joined
1/26/2014
Location
Vantaa FI
8/2/2020 12:44am
tek14 wrote:
6700€ for bike that has 5000€ suspension... pretty cheap.
6700€ for the bike like on the first Picture.
The Cone Valve Fork is from the 350
Okay now i got it. Did u change valving for forks?
jeffro667
Posts
348
Joined
12/8/2015
Location
Jackson, OH US
Fantasy
3558th
8/2/2020 5:51am
jeffro667 wrote:
Very nice, imo the 300sx is an awesome bike! [img]https://p.vitalmx.com/photos/forums/2020/08/01/441628/s1200_20200727_122118.jpg[/img]
Very nice, imo the 300sx is an awesome bike!
Very clean looking Bike 👍👍
Do you have any usefull advice for Carburator and Powervalve Settings ?
I get 3 different PV Springs
I will have to check my specific jetting, but the first thing that needs to be done is to replace the jet block gasket, it will never run clean with the stock one. I use the yellow PV spring with the adjuster ran flush.
8/2/2020 6:41am
jeffro667 wrote:
Very nice, imo the 300sx is an awesome bike! [img]https://p.vitalmx.com/photos/forums/2020/08/01/441628/s1200_20200727_122118.jpg[/img]
Very nice, imo the 300sx is an awesome bike!
Very clean looking Bike 👍👍
Do you have any usefull advice for Carburator and Powervalve Settings ?
I get 3 different PV Springs
jeffro667 wrote:
I will have to check my specific jetting, but the first thing that needs to be done is to replace the jet block gasket, it will...
I will have to check my specific jetting, but the first thing that needs to be done is to replace the jet block gasket, it will never run clean with the stock one. I use the yellow PV spring with the adjuster ran flush.
What do you mean with jet block gasket, do you have a picture ?
barrs211
Posts
322
Joined
4/16/2012
Location
GB
8/2/2020 6:53am
Following. Also just purchased the 300 SX kit. And would like to know what setup changes you’ve had to make
8/2/2020 11:05am
What do you mean with jet block gasket, do you have a picture ?
think he means the o- ring thats in the carb remove the jet block and you find it, jetblock is where you screw your main jet into
RPM68
Posts
1559
Joined
11/18/2006
Location
DFW, TX US
8/2/2020 11:55am
I am about done with my 300 SX..

Here is my 2019 Build, not totally done, but I only want to paint swingarm and anodize forks. Perhaps some other little things. The cool thing about this build, is 90% of this stuff can be purchased from your Local WPS dealer. As a rep for the company, I am a firm believer in the products we sell.

2019 300 SX

-250 SX with KTM 300 SX Kit (300 ecu sucks and doesn’t rev, went back to 250 ECU)
-Keihin Carb Swap
165 main, 42 Pilot, NOZ E Needle
-V-Force Reeds
-2020 Yamaha KYB Internal Forks
-Enzo Racing Fork and shock Revalve and Spring for 150lbs Motocross
-Galfer oversized rotor
-P3 Carbon Factory Skid Plate
-FMF Factory Fatty
-FMF shorty Titanium 2.0
-Raptor Titanium Footpegs (Not pictured)
-Polisport Grey Plastics
-MX Gurl Designs Graphics
-Guts Racing Winged Seat Cover
-Rims Plus Wheel Set
-Dirttricks 48T rear sprocket (Minus 2 from stock)
-Firepower Gold Chain (shown with 10 Hours)
-Michelin Starcross 5 Soft Front
-Pirelli Scorpion MX32 Soft (sand) rear









5
8/2/2020 12:24pm
RPM68 wrote:
I am about done with my 300 SX.. Here is my 2019 Build, not totally done, but I only want to paint swingarm and anodize forks...
I am about done with my 300 SX..

Here is my 2019 Build, not totally done, but I only want to paint swingarm and anodize forks. Perhaps some other little things. The cool thing about this build, is 90% of this stuff can be purchased from your Local WPS dealer. As a rep for the company, I am a firm believer in the products we sell.

2019 300 SX

-250 SX with KTM 300 SX Kit (300 ecu sucks and doesn’t rev, went back to 250 ECU)
-Keihin Carb Swap
165 main, 42 Pilot, NOZ E Needle
-V-Force Reeds
-2020 Yamaha KYB Internal Forks
-Enzo Racing Fork and shock Revalve and Spring for 150lbs Motocross
-Galfer oversized rotor
-P3 Carbon Factory Skid Plate
-FMF Factory Fatty
-FMF shorty Titanium 2.0
-Raptor Titanium Footpegs (Not pictured)
-Polisport Grey Plastics
-MX Gurl Designs Graphics
-Guts Racing Winged Seat Cover
-Rims Plus Wheel Set
-Dirttricks 48T rear sprocket (Minus 2 from stock)
-Firepower Gold Chain (shown with 10 Hours)
-Michelin Starcross 5 Soft Front
-Pirelli Scorpion MX32 Soft (sand) rear









Wow Good looking bike
Can you tell me more about the ECU why is it Not working with the 300??
ROCKNDAWG
Posts
96
Joined
9/9/2014
Location
Kingman, AZ US
8/2/2020 1:17pm
ROCKNDAWG wrote:
Very cool bike! Is that the normal or shorty version of the 2.1 silencer? I can never find anything that shows them next to each other.
I think it‘s the Shorty Version
Thanks, Im about ready to buy one and I don't want anything longer.
philG
Posts
9630
Joined
5/12/2012
Location
GB
8/2/2020 1:36pm
A lot of the EMX 300 guys went back to 250, i know the bigger Yamaha's just didnt seem to go as well... TM300 was fine because it was designed to be a 300.

I found the same when we tried to bore and stroke the 300 to 330, it didnt want to rev with the bigger piston and longer stroke , for Supermoto, and after a load of work we went back to 300 and went a shitload better.

What i can say , is that the TM felt like a slow 500, it didnt have the zip of the 250, but i think it runs a better patime as an MX bike.

RPM68
Posts
1559
Joined
11/18/2006
Location
DFW, TX US
8/2/2020 2:38pm
RPM68 wrote:
I am about done with my 300 SX.. Here is my 2019 Build, not totally done, but I only want to paint swingarm and anodize forks...
I am about done with my 300 SX..

Here is my 2019 Build, not totally done, but I only want to paint swingarm and anodize forks. Perhaps some other little things. The cool thing about this build, is 90% of this stuff can be purchased from your Local WPS dealer. As a rep for the company, I am a firm believer in the products we sell.

2019 300 SX

-250 SX with KTM 300 SX Kit (300 ecu sucks and doesn’t rev, went back to 250 ECU)
-Keihin Carb Swap
165 main, 42 Pilot, NOZ E Needle
-V-Force Reeds
-2020 Yamaha KYB Internal Forks
-Enzo Racing Fork and shock Revalve and Spring for 150lbs Motocross
-Galfer oversized rotor
-P3 Carbon Factory Skid Plate
-FMF Factory Fatty
-FMF shorty Titanium 2.0
-Raptor Titanium Footpegs (Not pictured)
-Polisport Grey Plastics
-MX Gurl Designs Graphics
-Guts Racing Winged Seat Cover
-Rims Plus Wheel Set
-Dirttricks 48T rear sprocket (Minus 2 from stock)
-Firepower Gold Chain (shown with 10 Hours)
-Michelin Starcross 5 Soft Front
-Pirelli Scorpion MX32 Soft (sand) rear









Wow Good looking bike
Can you tell me more about the ECU why is it Not working with the 300??
The 300 ECU comes with the 300 SX Kit from KTM. I rode on it for about 6-8 hours on it. I was scratching my head bc my jetting was good, but it just wasn’t right. I had a 14 300XC that felt better than this. So went down two teeth hoping to make that bottom end hit pull longer, byt she just needed to be able to rev.

Once I put the stock ecu back on. She came back alive and now she sounds insane! Does exactly what I want, and with the YZ Forks, its a whole new machine. KTM’s would be unstoppable off the showroom if they threw away those Garbage WP Forks.
1

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