Ktm 250 sx top end power

JBernard_401
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JBernard_401 9/17/2014 7:49am
9/17/2014 7:49am
look at the underside of the slide (bottom in the pic) and there should be a keihin casting logo mark and a # right next to it.
Tuck812
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Tuck812 9/17/2014 8:21am
9/17/2014 8:21am
Will do when I get home tonight thanks
Tuck812
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Tuck812 9/17/2014 1:11pm
9/17/2014 1:11pm
What everyone's thoughts on these bar mounts ?

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JBernard_401
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JBernard_401 9/17/2014 2:15pm
9/17/2014 2:15pm
seen MULTIPLE people dislike them. saying that they cant tell a difference and they are stupid $.
which sucks cause i wouldnt mind taming down some of the vibration on my 300. i wonder if an applied rubbermount set vs the ktm bar mounts is much difference.
digger
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digger 9/17/2014 2:54pm
9/17/2014 2:54pm
JBernard_401 wrote:
i think you'll like it a lot better.
one should be a 6.0 and the other a 6.5 slide. which model/year did you get.
A 13' 125sx comes with a 7.0 slide, and your 250sx came with a 6.5 slide. The slide is marked as to which it is, on it's underside, where the needle comes thru the hole on the bottom of the slide. you will want to use the 7.0 slide. It will provide cleaner jetting than the stock 6.5 slide. The difference between the 2 slides is that the 7.0 slides arc/halfmoon on the back side is 1/2 mm taller than the 6.5 slide. This will create slightly leaner jetting up to about 40% of the throttle opening.
Tuck812
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Tuck812 9/17/2014 2:55pm
9/17/2014 2:55pm Edited Date/Time 9/17/2014 3:26pm
JBernard_401 wrote:
seen MULTIPLE people dislike them. saying that they cant tell a difference and they are stupid $. which sucks cause i wouldnt mind taming down some...
seen MULTIPLE people dislike them. saying that they cant tell a difference and they are stupid $.
which sucks cause i wouldnt mind taming down some of the vibration on my 300. i wonder if an applied rubbermount set vs the ktm bar mounts is much difference.
I did ride engineering triple clamps on my tc 125 with their rubber mount top clamp and really like them. The reason why I was asking is I didn't want to do clamps if I didn't need to but with that being said I can get the ride set up for about 195 dollars difference
Pilon_fx
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Pilon_fx 9/17/2014 3:07pm
9/17/2014 3:07pm
The only time I had a real problem with gnarly vibration (head shake) was in my kx500. I threw a stabilizer on her and that took care of the shake as well as some added control. I've debated throwing one in the '14 250sx. Probably won't.
Pilon_fx
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Pilon_fx 9/17/2014 3:09pm
9/17/2014 3:09pm Edited Date/Time 9/17/2014 3:10pm
Anyone else running a Kreft power valve dial? Me likey.

It's the little orange guy posterior the expansion chamber.
Tuck812
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Tuck812 9/17/2014 5:20pm
9/17/2014 5:20pm
Pilon_fx wrote:
Anyone else running a Kreft power valve dial? Me likey. [img]https://p.vitalmx.com/photos/forums/2014/09/17/65481/s1200_image.jpg[/img] It's the little orange guy posterior the expansion chamber.
Anyone else running a Kreft power valve dial? Me likey.

It's the little orange guy posterior the expansion chamber.
I haven't but was thinking about trying one
Tuck812
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Tuck812 9/17/2014 7:28pm
9/17/2014 7:28pm
I checked my slides I have 6.5 and 7.0
Markee
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Markee 9/18/2014 5:09am
9/18/2014 5:09am
Digger29 wrote:
I forgot. Put a VForce on it too.
Crush wrote:
Yarp. That made a big difference to my 300.
I thought all KTMs came stock with VForce reed intake?
Pilon_fx
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Pilon_fx 9/18/2014 6:24am
9/18/2014 6:24am
Did. Changed in 2014. From action mag:

: The biggest news is that KTM switched from Moto Tassinari reeds to Boyesen reeds, but we aren’t talking about a Boyesen RAD valve system. KTM designed their own proprietary reed block that you would swear was still a Moto Tassinari VForce unit (since it features twin Vs and eight petals). Boyesen supplies KTM with their all-new RC2 performance-weave carbon fiber petals. The new KTM/Boyesen reed system fits into the engine at a steeper angle, and the 2014 reeds will fit into any previous 250SX with a four-bolt reed block.


I'm picking up MT's today to see if it's that different.
KTMShane699
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KTMShane699 9/18/2014 6:39am
9/18/2014 6:39am
Markee wrote:
I thought all KTMs came stock with VForce reed intake?
In 2014 they changed to Boyesen which is similar to the older Moto Tassinari. Going to the V-Force was a big step up in throttle response and mid-range. I wouldn't hesitate to put one in for anyone that has a 2014 KTM.

Shane
Pilon_fx
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Pilon_fx 9/18/2014 1:41pm
9/18/2014 1:41pm
Tuck812 wrote:
I bought one for a 13 125sx model here is a pic 38 slide is the one on the left ]https://p.vitalmx.com/photos/forums/2014/09/17/65435/s1200_image.jpg[/img]
I bought one for a 13 125sx model here is a pic 38 slide is the one on the left ]https://p.vitalmx.com/photos/forums/2014/09/17/65435/s1200_image.jpg[/i…]

I dropped a necj needle in mine today. Totally smoothed out the mid-range hesitation. Re-placed the red PV spring (was running green @ 1 turn from flush) and stood her right up in third and ride through 4th!! Had the red spring at one full turn from flush.

I'm at 5000 feet- I'm running 155/40 w the screw 2 turns out and clip is 3 down. She sure does purr.

Next step is the carb swap. Hopefully this weekend! Thanks for all the great input!
Pilon_fx
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Pilon_fx 9/19/2014 4:42pm
9/19/2014 4:42pm
JBernard_401 wrote:
i think you'll like it a lot better.
one should be a 6.0 and the other a 6.5 slide. which model/year did you get.
digger wrote:
A 13' 125sx comes with a 7.0 slide, and your 250sx came with a 6.5 slide. The slide is marked as to which it is, on...
A 13' 125sx comes with a 7.0 slide, and your 250sx came with a 6.5 slide. The slide is marked as to which it is, on it's underside, where the needle comes thru the hole on the bottom of the slide. you will want to use the 7.0 slide. It will provide cleaner jetting than the stock 6.5 slide. The difference between the 2 slides is that the 7.0 slides arc/halfmoon on the back side is 1/2 mm taller than the 6.5 slide. This will create slightly leaner jetting up to about 40% of the throttle opening.
Digger,

I made contact w a dude who builds cr500af for fun, and he uses Pwk 39.5 carb. My initial thought is if 38 is good, 39.5 is better bc a motor is a big air pump at the end of the day. Has the same d-shape slide but it is not an air striker.

1. Does it matter that it's 39.5 and not an air striker?

2. Why are we swapping slides?

Thx!!!
digger
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digger 9/19/2014 5:44pm
9/19/2014 5:44pm
A 39.5non taper bored carb wil have a negative effect on the engines lowend. The 39.5mm carb will not be able to draw air through it as quickly as a 38mm carb. The 39.5mm carb is also 15mm longer in overall length at 91mm,and may cause fitment issues. It more than likely will require slightly different jetting specs, like a larger pilot and main jetting,due to less draw throught the carb.It may very well make more peak hp, but will that translate into faster lap times vs a more ridable motor?

The leaner slide will lean the transition from into the pilot jet and into the needle, which when combined with the right needle will make the bike's power cleaner, more linear, and more responsive.
CheesePreetza 9/19/2014 6:06pm
9/19/2014 6:06pm Edited Date/Time 9/19/2014 6:08pm
Tuck812 wrote:
What everyone's thoughts on these bar mounts ?[img]https://p.vitalmx.com/photos/forums/2014/09/17/65463/s1200_image.jpg[/img]
What everyone's thoughts on these bar mounts ?

I enjoy mine, they are worth the money, take some engine vibration and initial shock out of your hands. Racing harescrambles i notice the mounts working more in the woods than on the track. You can get softer elastomers here
http://slavensracing.com/shop/progressive-handlebar-dampening-system-phds-by-xtrig-for-ktmhusaberg/

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Pilon_fx
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Pilon_fx 9/19/2014 10:54pm
9/19/2014 10:54pm
Awesome, thank you!

I read where you put a cr250 throttle on your '13. What did you gain with that over a Ktm??
Tuck812
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Tuck812 10/6/2014 8:42pm
10/6/2014 8:42pm
I rode my bike today for the first time with these mods: Vforce 4, pwk 38 carb, and 14/50 gearing. It rips and definatly has a lot more top end pull. The Rg3 supension seems really stiff, but this is my first ride on it so hopefully it gets better. I tried the N3Wk needle but going to switch back to the suzuki NECJ needle.
JBernard_401
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JBernard_401 10/7/2014 3:49am
10/7/2014 3:49am
ive got the necj needle, what did you feel different with the n3wk you didnt like?
Tuck812
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Tuck812 10/7/2014 7:08am
10/7/2014 7:08am
JBernard_401 wrote:
ive got the necj needle, what did you feel different with the n3wk you didnt like?
Low to mid was great mid to top was good, but I feel like the NECJ needle was better up top I'm gonna try them both back to back today.
digger
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digger 10/7/2014 7:39am
10/7/2014 7:39am
JBernard_401 wrote:
ive got the necj needle, what did you feel different with the n3wk you didnt like?
Tuck812 wrote:
Low to mid was great mid to top was good, but I feel like the NECJ needle was better up top I'm gonna try them both...
Low to mid was great mid to top was good, but I feel like the NECJ needle was better up top I'm gonna try them both back to back today.
The only difference between those 2 needles is the leaner starting diameter on the K needle and the 1st taper of the N3WK is slightly leaner. Tapers 2 and 3 are identical, also the N3WK is 1/2 clip position richer than the NECJ. IMO, the Yamaha/KTM N3xx needles may work slightly better up top than the Suzuki and Kawasaki needles, but it debatable. The Yamaha N3xx needles do hit harder into the middle though, if thats what you're looking for also.
Tuck812
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Tuck812 10/7/2014 8:12am
10/7/2014 8:12am
JBernard_401 wrote:
ive got the necj needle, what did you feel different with the n3wk you didnt like?
Tuck812 wrote:
Low to mid was great mid to top was good, but I feel like the NECJ needle was better up top I'm gonna try them both...
Low to mid was great mid to top was good, but I feel like the NECJ needle was better up top I'm gonna try them both back to back today.
digger wrote:
The only difference between those 2 needles is the leaner starting diameter on the K needle and the 1st taper of the N3WK is slightly leaner...
The only difference between those 2 needles is the leaner starting diameter on the K needle and the 1st taper of the N3WK is slightly leaner. Tapers 2 and 3 are identical, also the N3WK is 1/2 clip position richer than the NECJ. IMO, the Yamaha/KTM N3xx needles may work slightly better up top than the Suzuki and Kawasaki needles, but it debatable. The Yamaha N3xx needles do hit harder into the middle though, if thats what you're looking for also.
Digger thank you for the info. I defiantly did like the NECJ over the Ktm stock needle and liked the power with all the mods I did maybe I need to just give it another try. the conditions were different when I ran NECJ it was about 25 degrees hotter out
JBernard_401
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JBernard_401 10/7/2014 8:14am
10/7/2014 8:14am
what slide you running Tuck?
and how are you feeling about the 250sx getting it dialed in compared to your old 4T?
Tuck812
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Tuck812 10/7/2014 8:33am
10/7/2014 8:33am Edited Date/Time 10/7/2014 8:35am
JBernard_401 wrote:
what slide you running Tuck?
and how are you feeling about the 250sx getting it dialed in compared to your old 4T?
I'm running the 6.5 slide and I really like the 250 sx. It's easier to turn and feels lighter. I do miss the the electric start of the 4t and my redbull graphics, but that's about it . When I rode the 250sx yesterday, all the mods felt a lot faster to me, almost to fast, it was wheeling under acceleration out of the turns. I'm going to install the red spring this morning the rg3 supension is feeling really stiff going to play with the clickers today.

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