Getting a hair more power out of a 2018 kx250f

toms.ab
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toms.ab
i love the power from this bike but i just want a little more top end pull, any simple motor mods that WONT sacrifice reliability? Ive had it remapped which helped some and am running vp110, Better fuel help? cant afford pro circuit cams and springs, thoughts on higher compression piston?
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mxb2
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mxb2 5/20/2019 11:18am
5/20/2019 11:18am
Vp pro6. , Vortex ecu from twisted develelopment.
kb228
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kb228 5/20/2019 11:19am
5/20/2019 11:19am
An HC piston and the stage 2 cams from hotcams should do the trick.
Falcon
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Falcon 5/20/2019 2:48pm
5/20/2019 2:48pm
If you don't mind losing a little snap off the bottom, go down one tooth on the rear sprocket.
toms.ab
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toms.ab 5/20/2019 8:37pm
5/20/2019 8:37pm
kb228 wrote:
An HC piston and the stage 2 cams from hotcams should do the trick.
often wondered about hotcams, would i need a remap?

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yz133rider
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yz133rider 5/21/2019 3:04am
5/21/2019 3:04am
If you order a yosh from tokyo mods theyll remap for free. Id start there. Full exhaust, remap and ask them which fuel and map for it.
kb228
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kb228 5/21/2019 4:52am
5/21/2019 4:52am
kb228 wrote:
An HC piston and the stage 2 cams from hotcams should do the trick.
toms.ab wrote:
often wondered about hotcams, would i need a remap?
Wouldnt “need” one. I will say the remap i did on mine after i built the motor gave me more power than the mods alone did.
dmm698
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dmm698 5/21/2019 6:09am
5/21/2019 6:09am Edited Date/Time 5/21/2019 6:12am
kb228 wrote:
An HC piston and the stage 2 cams from hotcams should do the trick.
Stage 2 cams would help up top. High compression piston will provide more low end grunt, would need to go back and look at some notes/data to be certain but this is what I remember.

Run a pipe with a properly tuned map. Stop wasting your money on 110 leaded fuel, its not a high compression 2 stroke. Run U4.4 with a proper remap or MR12 if you want to spend a fortune on fuel.

Take your bike to a dyno and set it up properly. Send it across the country for some mystery magic to be flashed in by somebody for sub par results. Does tokyo mods even have a dyno?
dmm698
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dmm698 5/21/2019 6:10am
5/21/2019 6:10am
mxb2 wrote:
Vp pro6. , Vortex ecu from twisted develelopment.
When spending 150+ dollars for a 5 gallon pale of fuel, MR12, is a much better fuel if he's not bound by ama pro regulations. U4.4 will also make more power, for half the cost.
kb228
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kb228 5/21/2019 7:16am
5/21/2019 7:16am
kb228 wrote:
An HC piston and the stage 2 cams from hotcams should do the trick.
dmm698 wrote:
Stage 2 cams would help up top. High compression piston will provide more low end grunt, would need to go back and look at some notes/data...
Stage 2 cams would help up top. High compression piston will provide more low end grunt, would need to go back and look at some notes/data to be certain but this is what I remember.

Run a pipe with a properly tuned map. Stop wasting your money on 110 leaded fuel, its not a high compression 2 stroke. Run U4.4 with a proper remap or MR12 if you want to spend a fortune on fuel.

Take your bike to a dyno and set it up properly. Send it across the country for some mystery magic to be flashed in by somebody for sub par results. Does tokyo mods even have a dyno?
The flash they did on my 450 turned it into a raped ape. I dont even want to ride it like that anymore & went back to a stock ecu. A dyno tune is better by far but also 3x the price
Blake_Toms
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Blake_Toms 5/21/2019 9:00pm
5/21/2019 9:00pm
kb228 wrote:
An HC piston and the stage 2 cams from hotcams should do the trick.
dmm698 wrote:
Stage 2 cams would help up top. High compression piston will provide more low end grunt, would need to go back and look at some notes/data...
Stage 2 cams would help up top. High compression piston will provide more low end grunt, would need to go back and look at some notes/data to be certain but this is what I remember.

Run a pipe with a properly tuned map. Stop wasting your money on 110 leaded fuel, its not a high compression 2 stroke. Run U4.4 with a proper remap or MR12 if you want to spend a fortune on fuel.

Take your bike to a dyno and set it up properly. Send it across the country for some mystery magic to be flashed in by somebody for sub par results. Does tokyo mods even have a dyno?
I run 110 because it’s cheap and clean, I get it wholesale. I ordered a pipe but there’s no where that can dyno tune within 200 miles of me so Tokyo mods it will have to be
dmm698
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dmm698 5/22/2019 5:23am
5/22/2019 5:23am Edited Date/Time 5/22/2019 5:27am
kb228 wrote:
An HC piston and the stage 2 cams from hotcams should do the trick.
dmm698 wrote:
Stage 2 cams would help up top. High compression piston will provide more low end grunt, would need to go back and look at some notes/data...
Stage 2 cams would help up top. High compression piston will provide more low end grunt, would need to go back and look at some notes/data to be certain but this is what I remember.

Run a pipe with a properly tuned map. Stop wasting your money on 110 leaded fuel, its not a high compression 2 stroke. Run U4.4 with a proper remap or MR12 if you want to spend a fortune on fuel.

Take your bike to a dyno and set it up properly. Send it across the country for some mystery magic to be flashed in by somebody for sub par results. Does tokyo mods even have a dyno?
Blake_Toms wrote:
I run 110 because it’s cheap and clean, I get it wholesale. I ordered a pipe but there’s no where that can dyno tune within 200...
I run 110 because it’s cheap and clean, I get it wholesale. I ordered a pipe but there’s no where that can dyno tune within 200 miles of me so Tokyo mods it will have to be
You're probably giving up power running your cheap and clean whole sale priced 110 octane over the pump fuel your bike was designed for - Jus sayin'.... Its a tough pill to swallow for some but 110 leaded is just not going to help out a stock kx250f.

Wholesale = Dispensed to you from a 54 gallon drum at a race shop (Old, been open, dispensing a few gallons at a time to people)? From a pump in the ground (Low turn over rate)? Or are you actually getting 5 gallon pails that are sealed? No matter how stale the fuel is I suppose it wont make a bit of difference in your case as losing the light ends of the fuel wont quite matter because you dont need the octane.

SO my advice is go back to pump fuel, and stick with it unless you plan to have the ECU remapped for an oxygenated fuel that will make power.
c0ncEpT
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c0ncEpT 5/22/2019 6:31am
5/22/2019 6:31am
HC piston, cams, U4.4, and a remap. It'll be a whole different bike.

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