Husqvarna tc250 2018 dyno

jeffoff
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jeffoff
Edited Date/Time 9/3/2020 4:06am
Bought this 2018 tc250 end of previous year, had not the intention of going this far in rebuilding and such.
Just the nature of the beast, to make it as best as possible.
Stripped bike, teared engine down til the last bolt.
New crankshaft bearings, and 2 new bearings in tranny.
New big end with conrod
Honed cylinder and new piston
VHM cilinder head
Cleaned up ports and crankcase
Vforce 4 intake
New linkage bearings and cleaned/greased everything else
New chain & sprockets with chaineguides
Acerbis frameprotection
Pro carbon skidplate and front discquard
Renthal twinwall 996
Odi husqvarna grips
Renewed al fluids from brakes/clutch
Motomaster oversize front brake
Ohlins 2017 suspension front and rear
New plastics with custom graphics set
New pps works exhaust system.
Powdercoated frame.
Talon hubs with excell rims, sandtyre set
Oem wheel set for hard pack
Bike has 32hrs now
No ride report as i broke my scapula just in my 4th lap riding the bike ?.



1
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jeffoff
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jeffoff 4/13/2019 3:29am
4/13/2019 3:29am






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jeffoff
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jeffoff 4/13/2019 3:40am
4/13/2019 3:40am














Looking forward to ride it ✊



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brooklynevans 4/13/2019 6:45am
4/13/2019 6:45am
Nice build! Where did you get the PPS pipe from?
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jeffoff
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jeffoff 4/13/2019 6:58am
4/13/2019 6:58am
brooklynevans wrote:
Nice build! Where did you get the PPS pipe from?
Thanks.
Bought it directly from pps, no website but has facebook page.
Belgian craftsmanship, some emx teams uses these exhaust.
And i see them frequently on others peoples bikes, from what i am told they seem to work very well.
Did not ride the bike with this pipe yet...
1

The Shop

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JWACK
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JWACK 4/13/2019 7:15am
4/13/2019 7:15am
Nice job! I dig the exhaust. It's the first one I've seen on the new gen 250 that looks "right" with that smoth round shape.
Ride report when you get the chance please!
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jeffoff
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jeffoff 4/13/2019 8:22am
4/13/2019 8:22am
JWACK wrote:
Nice job! I dig the exhaust. It's the first one I've seen on the new gen 250 that looks "right" with that smoth round shape. Ride...
Nice job! I dig the exhaust. It's the first one I've seen on the new gen 250 that looks "right" with that smoth round shape.
Ride report when you get the chance please!
Yeah pipe looks nice.
Will do, but can take a few months.
First need to let the injury heal up good ?
jeffoff
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jeffoff 11/4/2019 10:30am
11/4/2019 10:30am
Finally rode the bike, minus the suspension wich i sold.
Everything was good except coming out of the corner, needed to use the clutch...
Think jetting is a bit off, past that point it is a rocket Laughing
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ledger
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ledger 11/5/2019 9:47pm
11/5/2019 9:47pm
I don't know how I missed this bike, but I just noticed it... well done and great looking !
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Spudnut
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Spudnut 11/8/2019 8:18am
11/8/2019 8:18am
Love my 18 tc! Once you get jetting dialed and pv the way you like it they are rocket ships
1
jeffoff
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jeffoff 12/7/2019 3:35am
12/7/2019 3:35am
Had the chance to ride once more, rained alot past period so track was nasty.
Heavy dutch sandtrack combined with rain makes you and the bike work.
Again, bike rips in higher rpm. But in turns it is a disaster, had to clutch all turns. Sometimes even going back to 1st gear.
Messed a bit with airscrew but could not make it work.
480main
45pilot
Needle 44-73 on 3rd clip.
As 1.5 turns out
14/49 gearing
Pirelli scorpion mx soft 410 paddle in the back
Red spring, 2 turns in.
Slide 4

The 480/45 jets with needle is a setting from a fast rider here, who trained alot @ this track with his sx250.
Bike just goes through his legs, no power and takes some time to build up speed.
Checked working of powervalve on stand in pits and is moving freely when revving the bike.
Only 2nd ride since complete rebuild, everything is good.
Did buy this bike second hand and once home i discoverd bike was not maintained at all, do not trust seller. Got me thinking if this is correct cdi? Ktm sticker is gone with type number, but this is on the back...



All reviews say this bike is powerful down low, i would like to find that power Silly
DannyST107 12/7/2019 3:53am
12/7/2019 3:53am
Hello i bought a 19 sx250 few months ago and it should be basicly the same motor, i had it completely stock when bought and rode it once. All power is bottom mid with stock everything and 14/50 which is stock too. Bike died a little on top so bought a hgs complete system and getting vhm head soon.

I don’t know anything about jetting, ton v grinsven is going to do that, but maybe short story, try 1 tooth higher on rear?
mxstate
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mxstate 12/7/2019 4:52am
12/7/2019 4:52am
DannyST107 wrote:
Hello i bought a 19 sx250 few months ago and it should be basicly the same motor, i had it completely stock when bought and rode...
Hello i bought a 19 sx250 few months ago and it should be basicly the same motor, i had it completely stock when bought and rode it once. All power is bottom mid with stock everything and 14/50 which is stock too. Bike died a little on top so bought a hgs complete system and getting vhm head soon.

I don’t know anything about jetting, ton v grinsven is going to do that, but maybe short story, try 1 tooth higher on rear?
Try this first before Keihin/Lectron swap (not telling you not to , but this is a low cost and proven setup)

https://www.vitalmx.com/forums/Tech-Help-Race-Shop,42/KTM-HUS-125-150-2…

DannyST107 12/7/2019 9:37am
12/7/2019 9:37am
DannyST107 wrote:
Hello i bought a 19 sx250 few months ago and it should be basicly the same motor, i had it completely stock when bought and rode...
Hello i bought a 19 sx250 few months ago and it should be basicly the same motor, i had it completely stock when bought and rode it once. All power is bottom mid with stock everything and 14/50 which is stock too. Bike died a little on top so bought a hgs complete system and getting vhm head soon.

I don’t know anything about jetting, ton v grinsven is going to do that, but maybe short story, try 1 tooth higher on rear?
mxstate wrote:
Try this first before Keihin/Lectron swap (not telling you not to , but this is a low cost and proven setup)

https://www.vitalmx.com/forums/Tech-Help-Race-Shop,42/KTM-HUS-125-150-2…

If it was a tip for me, no need as the motor is running really strong as it is just getting more top now with hgs system and head. Was more for OP, thanks alot tho!
jeffoff
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jeffoff 12/8/2019 1:28am
12/8/2019 1:28am
DannyST107 wrote:
Hello i bought a 19 sx250 few months ago and it should be basicly the same motor, i had it completely stock when bought and rode...
Hello i bought a 19 sx250 few months ago and it should be basicly the same motor, i had it completely stock when bought and rode it once. All power is bottom mid with stock everything and 14/50 which is stock too. Bike died a little on top so bought a hgs complete system and getting vhm head soon.

I don’t know anything about jetting, ton v grinsven is going to do that, but maybe short story, try 1 tooth higher on rear?
First ride after rebuild was with 52 sprocket, then it had the same problem. Not this intense...
Changed gearing after, was to short...
So something else is off...
jeffoff
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jeffoff 12/8/2019 1:33am
12/8/2019 1:33am
mxstate wrote:
Try this first before Keihin/Lectron swap (not telling you not to , but this is a low cost and proven setup)

https://www.vitalmx.com/forums/Tech-Help-Race-Shop,42/KTM-HUS-125-150-2…

I have these parts to try, but bike has to run better with stock setup also...
Will try for sure once i get everything sorted out.
On my te300 2017 i was way to lean, even for road use...
jeffoff
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jeffoff 12/8/2019 1:37am
12/8/2019 1:37am
My husqy dealer stepped up and lend me tc250/2017 cdi to try.
Should be able to test somewhere in next days...
MadsDausel 12/8/2019 1:45pm
12/8/2019 1:45pm Edited Date/Time 12/8/2019 1:46pm
Do you have raised the port timing when you clean the ports? Maybe this is the light in the pic with the exhaust port but the middel transfer port look really big? On my old ktm sx 250 17 I could ride 3 gear in all corner with one touch on clutch or 2 gear without clutch.
jeffoff
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jeffoff 12/9/2019 2:50am
12/9/2019 2:50am
MadsDausel wrote:
Do you have raised the port timing when you clean the ports? Maybe this is the light in the pic with the exhaust port but the...
Do you have raised the port timing when you clean the ports? Maybe this is the light in the pic with the exhaust port but the middel transfer port look really big? On my old ktm sx 250 17 I could ride 3 gear in all corner with one touch on clutch or 2 gear without clutch.
Good observation on that.
Port timing, angles or port surface is not altered by me or by previous owner.
I just cleaned up the inlets and exhaust...
However the light you see in the pic is a chip of nicasil missing, normally related to grinding near edges of ports. This is not the case and i am clueless why this chipped off.
It was this way when i bought the bike, like many other things not good...
So i opted to clean this up in such a way the rings will not catch it...
New nicasil will be done in the future and then that spot will be gone also.
Yes dealer says this also they have a bunch of low end and this is not normal...

Pit Row

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jeffoff
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jeffoff 12/10/2019 9:24am
12/10/2019 9:24am
Did some testing today.
Changing cdi made no difference, went back home to try some carb settings.
Although i was a bit sceptic about the settings mentioned in the KTM HUS 125 150 250 jetting thread, i had the parts already on the shelf ready to try out. On my te300 it was way to lean, but on my tc250 they proved to be good!
#5 slide, 5.5 i did not found over here. S4 needle jet, 42-75 needle on 3rd clip, 480main, 45 pilot, AS 1.3 turns out.
When i return the cdi to the shop i will buy 500main jet to try, some track riding needed to determine main and pilot jet sizes.
Happy i made some progress with the bike Laughing

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Premix4Life 12/10/2019 1:08pm
12/10/2019 1:08pm
Good to hear progress has been made. Looking forward to testing results. Good luck to you Sir.
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Sixeightone
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Sixeightone 12/12/2019 1:24pm
12/12/2019 1:24pm
KEIHIN CARB PWK38

6.0 SLIDE
NECJ NEEDLE MIDDLE POSITION
180 MAIN
42 PILOT-V-FORCE 40 PILOT -STOCK REEDS
2 TURNS OUT

Stop screwin' around with jetting that shitty mikuni.

I have a 19 tc250 same motor and it made it run 500 times better!

MadsDausel 12/13/2019 12:52am
12/13/2019 12:52am
I Think ecomaxx is running the Stock carb so there must be a good setting😁
jeffoff
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jeffoff 2/21/2020 3:19am
2/21/2020 3:19am
As the bike was still not running like it should, it was time to put it on the bench...

Last time out it still lacked power down low, visible in the graph.
Responsible for this was powervalve setting, not only the adjuster screw...
In midrange it also was on the lean side, 480 main is a bit to rich but ok. Pilot did not change.
What he changed was needle to JD red, and back to stock slide.

So now,
480main
35pilot
JD red needle
S4 needle jet
#4 slide



Graph shows nice improvement between 4000 & 6000 rpm, also little gain on top...
Maybe if weather stays ok track will be open this weekend to feel the difference.Smile
jeffoff
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jeffoff 2/21/2020 3:19am
2/21/2020 3:19am
jeffoff
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jeffoff 2/21/2020 3:20am
2/21/2020 3:20am

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jeffoff
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jeffoff 2/23/2020 8:08am
2/23/2020 8:08am
Did ride yesterday, but it was a tough one.
We received alot of rain this month and storm was passing over with strong winds and drizziling rain.
Track conditions were harsh but bike performed flawless, no need to use the clutch anymore Smile
Same sandtrack as previous ride, so ideal comparison.
Now hoping for better weather...
2
Dexter
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Dexter 2/29/2020 2:04pm
2/29/2020 2:04pm
What did you change on the powervalve setting ?
jeffoff
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jeffoff 3/1/2020 2:54am
3/1/2020 2:54am
Dexter wrote:
What did you change on the powervalve setting ?
They changed the number of turns for the powervalve setting.
Apperently the Z dimension/rod length is off, that is why i was chasing my tail. When rebuilding the engine I marked the position and put it back togheter the same way, next overhaul i will make this to factory spec.
Now he compensated with a "not normal" powervalve setting.
ar15
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ar15 9/1/2020 5:01am
9/1/2020 5:01am
jeffoff wrote:
Did some testing today. Changing cdi made no difference, went back home to try some carb settings. Although i was a bit sceptic about the settings...
Did some testing today.
Changing cdi made no difference, went back home to try some carb settings.
Although i was a bit sceptic about the settings mentioned in the KTM HUS 125 150 250 jetting thread, i had the parts already on the shelf ready to try out. On my te300 it was way to lean, but on my tc250 they proved to be good!
#5 slide, 5.5 i did not found over here. S4 needle jet, 42-75 needle on 3rd clip, 480main, 45 pilot, AS 1.3 turns out.
When i return the cdi to the shop i will buy 500main jet to try, some track riding needed to determine main and pilot jet sizes.
Happy i made some progress with the bike Laughing

Hey jeffoff. Just wondering if this still is your carb setup. I live in the south of the Netherlands and only ride on the famous/infamous (depending who you ask) sand tracks over here. Currently have the stock exhaust on it but considering to go for an aftermarket (HGS). Bike is a 2018 KTM SX250.
TheTwostrokeTaliban 9/1/2020 5:20am
9/1/2020 5:20am
There is a little tool you're looking for to set the powervalve, nihilo makes them. US company. Then you can get the linkage dialed.

I have one of these built like this. (Terry Varner motor and PWK carb with billet metering block) In the realm of 250 twostrokes, these lack on the front side of the curve where the crank has to use inertia to get the third shaft spinning. Then they pick up and take off and have a bit of mechanical over rev because of the third shaft.

Softest powervalve spring you can get is the best. Opens it up earlier and might take some of that dip out of the front side.

This is the first turn at Budds Creek, short deep first straight...you can see 450s really trying to stay in the camera frame just 150ft out of the gate. God bless em for their effort. Has to be difficult with so much latency between combustion events, those poor things.

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