Mikuni vs. Keihin - 2017 KTM 250SX

Bulldog
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Bulldog
Picked u p a new 2017 KTM 250SX. It comes stock with a Mikuni carb now. Our 2016 came with a Keihin, we had some mods done to it an really like the performance. Is there any reason swapping these carbs would cause any unforeseen issues? Thank you in advance...
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Skidaddle
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Skidaddle 11/22/2016 5:57pm
11/22/2016 5:57pm
Try it.
slipdog
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slipdog 11/22/2016 7:38pm
11/22/2016 7:38pm
I have both for my '17 TC 250, the stock Mikuni is better when jetted in correctly
seth505
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seth505 11/22/2016 7:56pm
11/22/2016 7:56pm
slipdog wrote:
I have both for my '17 TC 250, the stock Mikuni is better when jetted in correctly
Nice, that's good news. I was considering keeping carb off my 2013.
moto0852
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moto0852 11/22/2016 7:58pm
11/22/2016 7:58pm
slipdog wrote:
I have both for my '17 TC 250, the stock Mikuni is better when jetted in correctly
seth505 wrote:
Nice, that's good news. I was considering keeping carb off my 2013.
I have the 17 300 xc and while the mikuni seems to be a little more fickle to get right it seems better than going back to the Keihn. IMHO

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Deetsmx
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Deetsmx 11/22/2016 8:07pm
11/22/2016 8:07pm
Getting my lectron tomorrow, excited to try it.
moto0852
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moto0852 11/22/2016 8:28pm
11/22/2016 8:28pm
Deetsmx wrote:
Getting my lectron tomorrow, excited to try it.
Please report back on that.
Derek Harris 11/22/2016 9:45pm
11/22/2016 9:45pm
The mikuni stock vs pwk air striker stock when both are tuned in well has a definate edge to the mikuni.

ill try to dig up some dyno charts. Most people just hate jetting the mikuni...Its ultimately more tuneable
but more sensative too
CarlinoJoeVideo
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CarlinoJoeVideo 11/22/2016 10:17pm
11/22/2016 10:17pm
Deetsmx wrote:
Getting my lectron tomorrow, excited to try it.
I got a Lectron for my 16 125 and am pretty happy.

A few notes: my bike was used and when I put the carb on I was chasing a few problems. 1) my reeds were warped so I replaced those. 2) the silencer was super packed out, so they suggested I repack it, also I had a small gap where the pipe and silencer come together.

Once I got that dialed I've got 2 turns richer on the meetering rod and 1/4 turn richer on the power jet, now she's running great.
endurox
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endurox 11/22/2016 10:28pm
11/22/2016 10:28pm
Lectron carb is great for off road. Jetting stays the same with 4k elevation changes. BTW, the 17 Mikuni float level is 2.5mm to high out of the box. JD jetting has kits for all the 17 2 stroke models already in stock.
Charper732
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Charper732 11/23/2016 7:51am
11/23/2016 7:51am
Bulldog wrote:
Picked u p a new 2017 KTM 250SX. It comes stock with a Mikuni carb now. Our 2016 came with a Keihin, we had some mods...
Picked u p a new 2017 KTM 250SX. It comes stock with a Mikuni carb now. Our 2016 came with a Keihin, we had some mods done to it an really like the performance. Is there any reason swapping these carbs would cause any unforeseen issues? Thank you in advance...
They switched to Mikuni because the Keihin plant has been shut down. I had the infamous "stuck throttle" on my 250sx. When I was trying to figure out the issue I found out Keihin shut down their carburetor plant and they don't even have anyone for support anymore.
Deetsmx
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Deetsmx 11/23/2016 9:03am
11/23/2016 9:03am
CarlinoJoeVideo wrote:
I got a Lectron for my 16 125 and am pretty happy. A few notes: my bike was used and when I put the carb on...
I got a Lectron for my 16 125 and am pretty happy.

A few notes: my bike was used and when I put the carb on I was chasing a few problems. 1) my reeds were warped so I replaced those. 2) the silencer was super packed out, so they suggested I repack it, also I had a small gap where the pipe and silencer come together.

Once I got that dialed I've got 2 turns richer on the meetering rod and 1/4 turn richer on the power jet, now she's running great.
My reeds are in good shape and I've got a new fmf silencer on it. I let the guys at lectron know the mods I did and they built it so hopefully it's in the ball park. It also is coming with a shorter intake and new throttle assembly. Should be here this afternoon.
Deetsmx
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Deetsmx 11/23/2016 9:07am
11/23/2016 9:07am
endurox wrote:
Lectron carb is great for off road. Jetting stays the same with 4k elevation changes. BTW, the 17 Mikuni float level is 2.5mm to high out...
Lectron carb is great for off road. Jetting stays the same with 4k elevation changes. BTW, the 17 Mikuni float level is 2.5mm to high out of the box. JD jetting has kits for all the 17 2 stroke models already in stock.
I currently have a jd kit in there. While it's better than stock, I still feel like it's lacking. I still had to go up on pilot and main from their recommendations. I felt that when I got it good in one area it would take away from another. I've been wanting to try a lectron for a while so I finally pulled the trigger. I'll update Friday after I ride it.
fordo-197 11/23/2016 9:13am
11/23/2016 9:13am
the mikuni that came on my 17 husky was pretty much spot on stock for uk riding at sea level and cool conditions
Bruce372
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Bruce372 11/23/2016 9:49am
11/23/2016 9:49am
So are ktm using the same mikuni carb that comes on the yz125 or older rm125? Or the power jet version that came on the 05 and up rm125??
RPM68
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RPM68 11/23/2016 10:02am
11/23/2016 10:02am
Derek Harris wrote:
The mikuni stock vs pwk air striker stock when both are tuned in well has a definate edge to the mikuni. ill try to dig up...
The mikuni stock vs pwk air striker stock when both are tuned in well has a definate edge to the mikuni.

ill try to dig up some dyno charts. Most people just hate jetting the mikuni...Its ultimately more tuneable
but more sensative too
Derek hit the nail on the head. I had very good luck and most of my experience with the Keihin, the only reason why I dont like the mikuni is because im too lazy to learn it! lol

When speaking to douche bag (sleeter) he said it was specifically a performance based switch.
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