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My father and I picked up a 2018 KTM 250 and he immediately orders a 300 kit to make it more "tractor like" as we're coming off racing 450's.
The bike was barely ran in before the 300 kit was installed and, whilst I've been pretty happy with the bike, reading this forum I was surprised to see that few fast MX guys run the 300 so decided to put it back to stock (to my father's annoyance).
The bike rides SO much better, revs more freely and hangs onto gears longer. I can clear jumps easier and the already light bike feels like an e-mountain bike now.
Does any recommend any mod's to the stock 250 engine/carb? I've seen a few mentions of lectron etc in the past...
Incidentally I have the 300 kit for sale if anyone wants it for woods, trail riding. Less than 10 hours on it.
The bike was barely ran in before the 300 kit was installed and, whilst I've been pretty happy with the bike, reading this forum I was surprised to see that few fast MX guys run the 300 so decided to put it back to stock (to my father's annoyance).
The bike rides SO much better, revs more freely and hangs onto gears longer. I can clear jumps easier and the already light bike feels like an e-mountain bike now.
Does any recommend any mod's to the stock 250 engine/carb? I've seen a few mentions of lectron etc in the past...
Incidentally I have the 300 kit for sale if anyone wants it for woods, trail riding. Less than 10 hours on it.
300SXS=Runs like a screaming banshee with unreal overrev
The Shop
Spend your effort in jetting the bike properly and getting the PSI setting for your weight/speed and adjusting the clickers. Save your money on proper maintenance.
How the hell are you having trouble clearing jumps? Just shift it, and she pulls.
And heck no, short shifting is not a wise practice for moto for several reasons and especially not on jump faces.
I do know some vets who claim to love the 300 for moto, but overwhelmingly the 250 is the preferred engine platform. I've ridden both extensively in moto, trails, and desert, and like the OP realized, the 250 is the better platform for any type of riding where there are higher speeds and top end is preferred. For slower gnarly types of riding, the 300 is generally preferred. You may not agree and to each there own, but this is not the popular consensus.
From the sound of it, the KTM doesnt like going bigger either,
I did hear that a lot of the EMX300 guys were running 250's , and the guys running Yamaha's who went big struggled as well.
To Whom It May Concern:
Thanks for contacting FMF Racing. The SST is meant for top end power but your Shorty silencer is meant for bottom end power.
We suggest changing your silencer to a Powercore 2 which makes great power through the mid and top end of the RPM's.
Pit Row
The stock exhaust felt too chocked up to me , compare to the Pro Ciruit system.
it isnt as light in the rev as a 250 but i can pull the rev pretty high
As mentioned there are a lot of other factors: carb/jetting, pipe/silencer, head/squish and ignition.
One story in MXA suggested an SX barrel conversion, fully set up MX style is too much for all but the fastest pro.
Personally, if I was going this way, I’d go the EXC barrel, and tune it UP from there, if required.
I rode a 2014 KTM 300 (offroad version w/o the headlight) and it felt like a good running 250, yes it pulled just slightly harder through the mid range and was smooth but compared to any 250 2 stroke mx based bike it wasnt as snappy and quick/free revving.
If the OP was still looking for mods for his 300sx, by now he'd surely be confused as hell. It seems everyone has a different idea on what to do to maximize the engine output for riding mx lol
From my own experience, the shorty provided more power and top end, but in all those cases I was coming off the longer stock silencer.
Post a reply to: KTM 300 kit worse for MX - recommendations?