2024 KTM 300SX Official Thread

Smith246 wrote:

Yeah I agree the midrange hit was pretty gnarly and definitely more tiring than 350sxf. I just felt it lacked alot in the bottom end compared...

Yeah I agree the midrange hit was pretty gnarly and definitely more tiring than 350sxf. I just felt it lacked alot in the bottom end compared to the 350, then come on very strong but signed off really early.

 I bought it thinking it would be my main MX bike but for me the 350 is better for that. It was alot of fun in the bush but.

urbanlift707 wrote:

Wild the difference people’s perspectives can be, I’ve hopped on my buddies 23 350 several times  and it has nothing down low compared to my 300...

Wild the difference people’s perspectives can be, I’ve hopped on my buddies 23 350 several times  and it has nothing down low compared to my 300. I’m not saying you’re wrong at all, but when I ride his 350 my biggest complaint is how slow it takes to build power. It easily and obviously revs way past what my 300 does so you can carry each he’s longer, but I’m quicker from corner to corner on my 300 by banging a quick 2-3 shift and letting the quick building power of the 300 do its thing vs waiting for the 350 to build up to a reasonable hp. 

I’m also faster on my tc125 than my wife’s 250f so I just suck on four strokes…love them all though 125, 250f, 350f, 300 each are fun in what they excel at I’m just oddly faster on each classes two stroke vs four stroke.

Smith246 wrote:

Thanks for the feedback, appreciate it. I love my 350 and keeping that as my main bike. I just picked up a 25 150sx and as...

Thanks for the feedback, appreciate it. I love my 350 and keeping that as my main bike. I just picked up a 25 150sx and as much as i love it i think im a bit heavy for it. Sounds like the 250sx can be ridden alot more like a 150 than the 300 can be.

Tomok wrote:

How heavy are you? I'm looking at a 2025 150SX to replace my 450. I'm 190 lbs.

sandman768 wrote:

Most guys with the tbi 250 sx have said its lacking the power & hit of the tradiational 250 2t. My 300 never lacked for hp...

Most guys with the tbi 250 sx have said its lacking the power & hit of the tradiational 250 2t. My 300 never lacked for hp or hit, I felt it hit too hard on aggressive map in the midrange and eventually had it tuned for more overrev on top…. The charm of the 300 is , you can lug it or rev it…it has an answer for everything 

Smith246 wrote:

That's strange, that's what I didn't like about my 300sx compared to my 350sxf. I felt like you couldn't lug it or rev it, it had...

That's strange, that's what I didn't like about my 300sx compared to my 350sxf. I felt like you couldn't lug it or rev it, it had to be ridden right in the midrange. It never had enough grunt to pull 3rd and it would just fall on its face when you revved it out. Thought it might have just been me but many in my area felt the same, all sold them and went back to 350's or 450's.  

Smith246 wrote:

Thanks for the feedback, appreciate it. I love my 350 and keeping that as my main bike. I just picked up a 25 150sx and as...

Thanks for the feedback, appreciate it. I love my 350 and keeping that as my main bike. I just picked up a 25 150sx and as much as i love it i think im a bit heavy for it. Sounds like the 250sx can be ridden alot more like a 150 than the 300 can be.

Tomok wrote:

How heavy are you? I'm looking at a 2025 150SX to replace my 450. I'm 190 lbs.

TDC wrote:

I had a much faster buddy than I that sold a stock '23 300SX. He rode my WMR re-flash + PC Works pipe '24 and said...

I had a much faster buddy than I that sold a stock '23 300SX. He rode my WMR re-flash + PC Works pipe '24 and said he wouldn't have sold his if he had done the same changes. 

I do think the '23 350 in an inside rut is more snappy in 3rd. My 300 is smoother and I like not dealing with the engine braking to jumpy throttle transition of the 350.

Paul Geoghegan wrote:

I’ve got 12 hours on my 24. No issues when the track is optimal. It corners great, good stability but man this thing is harsh through...

I’ve got 12 hours on my 24. No issues when the track is optimal. It corners great, good stability but man this thing is harsh through the chop later in the day. I’ve tried a bunch of shock settings, tried to make the AER fork work, ran my revalved 6500 kit which helped out marginally. I’m getting my Sag numbers.  Wondering if others are having issues charging in late motos when the track is blown out. I understand it gets harder to ride in these conditions but this thing is borderline unridable. 

Craig_Lambrecht wrote:

thats always been my biggest complaint with AER forks. I've been on ktm group since 2014 and never one LOVED my forks. Pondering trying the kyb...

thats always been my biggest complaint with AER forks. I've been on ktm group since 2014 and never one LOVED my forks. Pondering trying the kyb inserts next.

sandman768 wrote:

Bumping this thread for an ECU question…My 23 300sx has a remap by TPI tuning, I picked up a new 25 300SX, has anyone just swapped...

Bumping this thread for an ECU question…My 23 300sx has a remap by TPI tuning, I picked up a new 25 300SX, has anyone just swapped ECU”s ? 23 to 25? I swapped mine over today & reset the powervalve, seemed ok on the stand…I will test it out Wednesday…I liked my TPI tune on my 23…..

whateversclever69 wrote:

Anybody put vforce reeds on their 300sx?

urbanlift707 wrote:

I swapped my twisted tunes 23 ecu to my 24 and it worked perfectly.

sandman768 wrote:

Bumping this thread for an ECU question…My 23 300sx has a remap by TPI tuning, I picked up a new 25 300SX, has anyone just swapped...

Bumping this thread for an ECU question…My 23 300sx has a remap by TPI tuning, I picked up a new 25 300SX, has anyone just swapped ECU”s ? 23 to 25? I swapped mine over today & reset the powervalve, seemed ok on the stand…I will test it out Wednesday…I liked my TPI tune on my 23…..

ktmracer726 wrote:

I had TPI tuning do my ECU. I could not get it to run correctly. Ran the correct ratio and fuel he suggested. It would load...

I had TPI tuning do my ECU. I could not get it to run correctly. Ran the correct ratio and fuel he suggested. It would load up in corners and landing from jumps. Off idle was bad. Hard lesson to learn for $300. 

I got the TSP ERM from slavens and used the TSP MX map. Runs clean. So much better.  

TDC wrote:

Anybody know of any issues running 40:1? I haven't felt any change in the WMR re-flash performance since the ratio change. I also enlarged a coolant passage at...

Anybody know of any issues running 40:1? 

I haven't felt any change in the WMR re-flash performance since the ratio change. 

I also enlarged a coolant passage at the top of the cylinder, closest to the main exhaust PV.  

TDC wrote:

Anybody know of any issues running 40:1? I haven't felt any change in the WMR re-flash performance since the ratio change. I also enlarged a coolant passage at...

Anybody know of any issues running 40:1? 

I haven't felt any change in the WMR re-flash performance since the ratio change. 

I also enlarged a coolant passage at the top of the cylinder, closest to the main exhaust PV.  

sandman768 wrote:

I have run 40,50 & 60:1 in my 23 300, can’t tell the difference…Top end at 100hrs, looked great. I run Amsoil Dominator with 25% C12...

I have run 40,50 & 60:1 in my 23 300, can’t tell the difference…Top end at 100hrs, looked great. I run Amsoil Dominator with 25% C12 & non ethanol pump….The only reason I have tried so many ratios is due to having multiple 2t”s I ride and 40:1 is generally what I run….how is that WMR reflash? 2 distinct maps? WMR is my local shop when I”m down in Florida for the winters, great shop but when I had mine 23 reflashed TPi tuning was 1/2 the price….

TDC wrote:

The flash on both maps are clean, crisp and linear. Distinct in that one has a slower pull and lower peak, defo less tiring. Mayhem is...

The flash on both maps are clean, crisp and linear. Distinct in that one has a slower pull and lower peak, defo less tiring. Mayhem is released on the green map, it doesn't pull any surprises, but so quick all the way to a nice top. I had a previous 300SX owner say that he wouldn't have returned to a YZ450 if he knew this potential in the 300. Fast dude, BTW.

TDC wrote:

The flash on both maps are clean, crisp and linear. Distinct in that one has a slower pull and lower peak, defo less tiring. Mayhem is...

The flash on both maps are clean, crisp and linear. Distinct in that one has a slower pull and lower peak, defo less tiring. Mayhem is released on the green map, it doesn't pull any surprises, but so quick all the way to a nice top. I had a previous 300SX owner say that he wouldn't have returned to a YZ450 if he knew this potential in the 300. Fast dude, BTW.

sandman768 wrote:

Nice…My TPI flash is very good, definitely better than stock, but I asked for the 2nd map to be a little rich/ safe for deep sand...

Nice…My TPI flash is very good, definitely better than stock, but I asked for the 2nd map to be a little rich/ safe for deep sand riding….Its a little dirty, so I only use the 1 map setting….I”m debating keeping the tuned EcU but may just sell that with the 23 and have WMR flash my new 25….do you run a splash of race fuel ? 

washed up vet b wrote:

Was loving my ‘24 until the past weekend it started to bog, then cut out. Fires back up, runs for a minute or so, increases then...

Was loving my ‘24 until the past weekend it started to bog, then cut out. Fires back up, runs for a minute or so, increases then revs slightly by itself, the dies. Has anyone come across this?

No fault codes thrown, unplugged electrics, new gas etc etc 

ktmracer726 wrote:

I had TPI tuning do my ECU. I could not get it to run correctly. Ran the correct ratio and fuel he suggested. It would load...

I had TPI tuning do my ECU. I could not get it to run correctly. Ran the correct ratio and fuel he suggested. It would load up in corners and landing from jumps. Off idle was bad. Hard lesson to learn for $300. 

I got the TSP ERM from slavens and used the TSP MX map. Runs clean. So much better.  

sandman768 wrote:

Thats unfortunate, he did mine and It has been great, even offered to perform undated maps for free,  since mine was done early in 23….did you...

Thats unfortunate, he did mine and It has been great, even offered to perform undated maps for free,  since mine was done early in 23….did you do the Dongle powervalve reset? 

washed up vet b wrote:

Was loving my ‘24 until the past weekend it started to bog, then cut out. Fires back up, runs for a minute or so, increases then...

Was loving my ‘24 until the past weekend it started to bog, then cut out. Fires back up, runs for a minute or so, increases then revs slightly by itself, the dies. Has anyone come across this?

No fault codes thrown, unplugged electrics, new gas etc etc 

washed up vet b wrote:

Was loving my ‘24 until the past weekend it started to bog, then cut out. Fires back up, runs for a minute or so, increases then...

Was loving my ‘24 until the past weekend it started to bog, then cut out. Fires back up, runs for a minute or so, increases then revs slightly by itself, the dies. Has anyone come across this?

No fault codes thrown, unplugged electrics, new gas etc etc 

sandman768 wrote:

How many hrs ? Recent maintenance? Inline fuel filter replaced? Chase wiring behind front # plate, around batttery ect. Plug wet? Bench test fuel pump…

bodycast wrote:

Replace the plug.  Make sure it is a plug with a resistor.

Also run the bikes at 60:1

bodycast wrote:

Replace the plug.  Make sure it is a plug with a resistor.

Also run the bikes at 60:1

Ob917 wrote:

I agree with the plug, been there. I do run mine at 50:1. No issue for me there. I’m sure 60:1 is just as good, but...

I agree with the plug, been there. I do run mine at 50:1. No issue for me there. I’m sure 60:1 is just as good, but my ratio cup just doesn’t have 60:1!

washed up vet b wrote:

Thanks, I’ll try that tonight, hopefully it’s just the plug!