125/150/250/300 KTM/HUS/GG jetting thread

AJ565
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AJ565 9/6/2021 1:21pm
9/6/2021 1:21pm
sandman768 wrote:
Finally got my new 125, thought I was all slick setting up the carb w/out removing it…..then I seen the new needle jet in the parts...
Finally got my new 125, thought I was all slick setting up the carb w/out removing it…..then I seen the new needle jet in the parts bag… 😂 looks like carb has to come off anyway….
I did mine on the bike
sandman768
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sandman768 9/7/2021 5:45am
9/7/2021 5:45am
AJ565 wrote:
I did mine on the bike
Just ordered the new jet block gasket, I was going to wait on that replacement but, might just as well do it now…
AJ565
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AJ565 9/7/2021 11:07am
9/7/2021 11:07am
AJ565 wrote:
I did mine on the bike
sandman768 wrote:
Just ordered the new jet block gasket, I was going to wait on that replacement but, might just as well do it now…
I did that on the bike too, it was a huge pain because I didn’t have any grease to hold it in place while I put it back together. It can be done tho.
yota
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yota 9/8/2021 5:01am
9/8/2021 5:01am
since I was doing everything at once I went ahead and took the carb off. was not that hard. any future changes I will do on the bike,

it is shameful that we basically have to rebuild these expensive carbs, change almost everything

my bike ran so much better sunday though..
2

The Shop

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huckster mcplush 9/10/2021 9:28am
9/10/2021 9:28am
Another little update with the 150xcw... Just for fun, went down from a 32.5 to a 30 pilot, and now I can hear a difference when adjusting the air screw. Got the best idle and throttle response at 2 turns out, so I should be good. Also for reference, I was previously using one of those JD quick tool free air screws. I compared the stock needle side by side, and they have a noticeably different taper to them. Haven't tried the JD air screw with the 30 pilot yet. Kind of interesting though with the profile being different than stock.
After changing the pilot, the bike felt very lean on the needle, very "zingy" if that makes sense. Always heard to go rich on the needle to the point of slight gurgle around half throttle, then back off slightly till it cleans up... Went from clip 2, 42-74 needle to clip 3, 43-74 needle for a total of 1.5 effective clip positions richer. Still no drastic rich gurgle at half throttle after fully warmed up and cleaned out. Power all around seems much broader, better pull down low and no weird flat spot then BRAAAAP!! Seems more linear and predictable.
Anyone else using the JD tool free air screw?
digger
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digger 9/10/2021 10:05am
9/10/2021 10:05am
huckster mcplush wrote:
Another little update with the 150xcw... Just for fun, went down from a 32.5 to a 30 pilot, and now I can hear a difference when...
Another little update with the 150xcw... Just for fun, went down from a 32.5 to a 30 pilot, and now I can hear a difference when adjusting the air screw. Got the best idle and throttle response at 2 turns out, so I should be good. Also for reference, I was previously using one of those JD quick tool free air screws. I compared the stock needle side by side, and they have a noticeably different taper to them. Haven't tried the JD air screw with the 30 pilot yet. Kind of interesting though with the profile being different than stock.
After changing the pilot, the bike felt very lean on the needle, very "zingy" if that makes sense. Always heard to go rich on the needle to the point of slight gurgle around half throttle, then back off slightly till it cleans up... Went from clip 2, 42-74 needle to clip 3, 43-74 needle for a total of 1.5 effective clip positions richer. Still no drastic rich gurgle at half throttle after fully warmed up and cleaned out. Power all around seems much broader, better pull down low and no weird flat spot then BRAAAAP!! Seems more linear and predictable.
Anyone else using the JD tool free air screw?
I'm glad to here that you are starting to get the bike working/tuned for you. I'm only here to get you in the ball park, jetting wise, the fine tuning is up to each Individual.
I haven't seen one of JD's air screw, but I suspect that they are based, taper wise off of Honda's OEM Mikuni's, which have a more linear taper, which allows for finer/ less aggressive tuning, than the KTM equipped Mikuni's, if I remember correctly.
huckster mcplush 9/10/2021 10:19am
9/10/2021 10:19am
digger wrote:
I'm glad to here that you are starting to get the bike working/tuned for you. I'm only here to get you in the ball park, jetting...
I'm glad to here that you are starting to get the bike working/tuned for you. I'm only here to get you in the ball park, jetting wise, the fine tuning is up to each Individual.
I haven't seen one of JD's air screw, but I suspect that they are based, taper wise off of Honda's OEM Mikuni's, which have a more linear taper, which allows for finer/ less aggressive tuning, than the KTM equipped Mikuni's, if I remember correctly.
Yes, that makes sense. The taper is much sharper, not as wide as the OEM KTM air screw. My plug looks much better now as well after making these changes. So I guess I was rich on the pilot, and lean on the needle. Seems that combination was masking the truth of what was really going on. Not that I want to screw things up while its going good, but I may do the front side notch on the #5 slide and try a 27.5 pilot. Aside from making the pilot more efficient and needing to go down a size on the pilot jet, is there any real big benefit to the front notch? Forgive me if I've asked before. I am just not seeing the logic if notching the front causes the pilot to provide more fuel, then reducing the jet size... My brain is saying isn't it the same a/f ratio? Thanks.
digger
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digger 9/10/2021 10:38am
9/10/2021 10:38am
huckster mcplush wrote:
Yes, that makes sense. The taper is much sharper, not as wide as the OEM KTM air screw. My plug looks much better now as well...
Yes, that makes sense. The taper is much sharper, not as wide as the OEM KTM air screw. My plug looks much better now as well after making these changes. So I guess I was rich on the pilot, and lean on the needle. Seems that combination was masking the truth of what was really going on. Not that I want to screw things up while its going good, but I may do the front side notch on the #5 slide and try a 27.5 pilot. Aside from making the pilot more efficient and needing to go down a size on the pilot jet, is there any real big benefit to the front notch? Forgive me if I've asked before. I am just not seeing the logic if notching the front causes the pilot to provide more fuel, then reducing the jet size... My brain is saying isn't it the same a/f ratio? Thanks.
I don't have a dyno to check the a/f ratio, but I do know that the notch seems to makes the bike idle better and also makes the air screw more effective, both slightly. If you do notch the slide, start out with the 30 pilot and work your way down, if you need too. If you're happy with the way the bike is running now, that's great. There's no need to cut the slide if you don't feel comfortable doing so. Ride on and be happy.
huckster mcplush 9/10/2021 10:52am
9/10/2021 10:52am
digger wrote:
I don't have a dyno to check the a/f ratio, but I do know that the notch seems to makes the bike idle better and also...
I don't have a dyno to check the a/f ratio, but I do know that the notch seems to makes the bike idle better and also makes the air screw more effective, both slightly. If you do notch the slide, start out with the 30 pilot and work your way down, if you need too. If you're happy with the way the bike is running now, that's great. There's no need to cut the slide if you don't feel comfortable doing so. Ride on and be happy.
Ok good to know. I'm fine with doing the notch, especially when hearing so many good reviews after doing so. I did notch my old #4 slide, but I think I rounded the edges too much. And for some reason I was told the opposite regarding the pilot, that I would have to increase the pilot jet, maybe that is why I didn't have good results..... Here is a couple pics of the front notch I did on the #4 a while back...

digger
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digger 9/10/2021 11:10am
9/10/2021 11:10am
huckster mcplush wrote:
Ok good to know. I'm fine with doing the notch, especially when hearing so many good reviews after doing so. I did notch my old #4...
Ok good to know. I'm fine with doing the notch, especially when hearing so many good reviews after doing so. I did notch my old #4 slide, but I think I rounded the edges too much. And for some reason I was told the opposite regarding the pilot, that I would have to increase the pilot jet, maybe that is why I didn't have good results..... Here is a couple pics of the front notch I did on the #4 a while back...

That notch looks like it's a little wider than mine, but The front side notch doesn't have to be nearly as accurate as the back side cutaway.
sandman768
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sandman768 9/12/2021 3:29pm
9/12/2021 3:29pm
Got out on my 22 125sx today with all the jetting changes in this thread. Put almost 2hrs on the bike, the jetting is perfect, bike ripped from bottom all way through the top! Well done guys.👍
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swatdoc
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swatdoc 9/18/2021 10:43pm
9/18/2021 10:43pm
FINALLY got my bike all back together, including revalved and modified forks and shock. Very anxious to try out the new cylinder porting from Lynks, and the new jetting. Just running it up the street, it feels pretty damn good - we'll see tomorrow at Lake Elsinore how it does on a track.

I did get the VHM carbon fiber air boot insert installed - here's a couple pics. The stock filter cage fits just fine, but what doesn't fit is the regular KTM/Husky air box wash cover. Had to order the Twin Air cover - it has more clearance.



2
swatdoc
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swatdoc 9/19/2021 5:45pm
9/19/2021 5:45pm
Bike ran great today. definitely a broader powerband - hardly used the clutch at all. Just left the jetting as is: 490 main, 30 pilot, clip in #2. Next time out I might try a 500 main just to see if it'll handle it.

Pretty happy with the porting and these carb settings. I'll run this for a while before I toss on the PWK/STIC
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yota
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yota 9/20/2021 5:36pm
9/20/2021 5:36pm
some kind of velocity stack?
yota
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yota 9/20/2021 5:53pm
9/20/2021 5:53pm
I have this from about 10 years ago for a 38mm airstryker. seemed to sharpen up the throttle response but some said it was just because it reduced the bore to 36mm more or less. wonder if it will fit the mikuni?



swatdoc
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swatdoc 9/20/2021 6:07pm
9/20/2021 6:07pm
yota wrote:
some kind of velocity stack?
check out my 9-2-21 post
yota
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yota 9/20/2021 7:26pm
9/20/2021 7:26pm
the boot on my husky is already stiff as hell. can't imagine it would deform much if at all as long as it was getting air flow thru it.
swatdoc
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swatdoc 9/29/2021 8:38pm
9/29/2021 8:38pm
Have any of you guys tried a flywheel weight on your 150?

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JMX82
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JMX82 9/29/2021 9:49pm
9/29/2021 9:49pm
swatdoc wrote:
Have any of you guys tried a flywheel weight on your 150?
I have heavier flywheel from 125 EXC (european enduro model) on my 2013 150SX and I like it a lot.
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Geky83
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Geky83 9/30/2021 1:31am
9/30/2021 1:31am
Hello guys,
I am an Italian guy, I have a Husky TC 125 2021 that I use for enduro races, but I am in trouble finding the right carb setting, mainly because just past the first quarter throttle the carburetion seems constantly very rich.
any of you have any advice for me?
or can you tell me the basic setting of the Husky TX 125 2021 US (not europe)?
Thank you.
Hello
AJ565
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AJ565 9/30/2021 5:47am
9/30/2021 5:47am
Geky83 wrote:
Hello guys, I am an Italian guy, I have a Husky TC 125 2021 that I use for enduro races, but I am in trouble finding...
Hello guys,
I am an Italian guy, I have a Husky TC 125 2021 that I use for enduro races, but I am in trouble finding the right carb setting, mainly because just past the first quarter throttle the carburetion seems constantly very rich.
any of you have any advice for me?
or can you tell me the basic setting of the Husky TX 125 2021 US (not europe)?
Thank you.
Hello
Page 1. Even has part numbers or where to find the parts.
Polishhammer 9/30/2021 6:47am
9/30/2021 6:47am
swatdoc wrote:
Have any of you guys tried a flywheel weight on your 150?
I have a new one still in the box if you want it. It’s a 10ounce
1
swatdoc
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swatdoc 9/30/2021 10:48am
9/30/2021 10:48am
swatdoc wrote:
Have any of you guys tried a flywheel weight on your 150?
Polishhammer wrote:
I have a new one still in the box if you want it. It’s a 10ounce [img]https://p.vitalmx.com/photos/forums/2021/09/30/512618/s1200_E5E5E6C1_CA6C_4D3A_ADD7_97F44B024AF8.jpg[/img]
I have a new one still in the box if you want it. It’s a 10ounce
Well bummer. I had already ordered an 8oz one to try
Bruce372
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Bruce372 9/30/2021 5:13pm
9/30/2021 5:13pm
swatdoc wrote:
Have any of you guys tried a flywheel weight on your 150?
Polishhammer wrote:
I have a new one still in the box if you want it. It’s a 10ounce [img]https://p.vitalmx.com/photos/forums/2021/09/30/512618/s1200_E5E5E6C1_CA6C_4D3A_ADD7_97F44B024AF8.jpg[/img]
I have a new one still in the box if you want it. It’s a 10ounce
swatdoc wrote:
Well bummer. I had already ordered an 8oz one to try
Was you the guy that bought the VHM weighted crank? How did it work out???
swatdoc
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swatdoc 9/30/2021 5:28pm
9/30/2021 5:28pm Edited Date/Time 10/2/2021 1:30pm
Not me Bruce. But I’m considering the 3mm stroker crank from Lynks
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Bruce372
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Bruce372 10/1/2021 9:51pm
10/1/2021 9:51pm
swatdoc wrote:
Not me Bruce. But I’m considering the 3mm stroker crank from Lynks
I'd love to hear how that runs
swatdoc
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swatdoc 10/2/2021 1:33pm
10/2/2021 1:33pm
swatdoc wrote:
Not me Bruce. But I’m considering the 3mm stroker crank from Lynks
Bruce372 wrote:
I'd love to hear how that runs
If i do it I'll let you know. It's $700 for the crank, so a little pricey. Lynks charges another $400 for install, but then I'd have shipping costs of a motor back and forth. I might consider just ordering the crank and having AEO install it for me.
Hammer 663s
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Hammer 663s 10/12/2021 9:54am
10/12/2021 9:54am
I just ordered an RK Tek head insert for our 2020 150Sx. It will be setup for 98-100 octane running a 92 non-eth + Sunoco 110 blend @ 40:1 w/Motul 800. I expect to have to go to a 520 main and a 35 pilot. Kelsey at RK said throw fuel at it till it can't take anymore then back off a little. I'll report back on how it worked out.

Hammer 663s
riv187
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riv187 10/12/2021 10:59am
10/12/2021 10:59am
Hammer 663s wrote:
I just ordered an RK Tek head insert for our 2020 150Sx. It will be setup for 98-100 octane running a 92 non-eth + Sunoco 110...
I just ordered an RK Tek head insert for our 2020 150Sx. It will be setup for 98-100 octane running a 92 non-eth + Sunoco 110 blend @ 40:1 w/Motul 800. I expect to have to go to a 520 main and a 35 pilot. Kelsey at RK said throw fuel at it till it can't take anymore then back off a little. I'll report back on how it worked out.

Hammer 663s
Kelsey made me a one off insert for my 18 TC125,,,,,I like it. I run straight 110 race gas,,so it's high compression. I feel like it improved the bottom and gave my bike a wider power delivery. Buds HGS pipe/silencer and stock porting. I only race MX,,but like a smooth pull coming out of tight slippery corners and RK Tek delivered.
1
Hammer 663s
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Hammer 663s 10/12/2021 12:09pm
10/12/2021 12:09pm Edited Date/Time 10/12/2021 12:18pm
Hammer 663s wrote:
I just ordered an RK Tek head insert for our 2020 150Sx. It will be setup for 98-100 octane running a 92 non-eth + Sunoco 110...
I just ordered an RK Tek head insert for our 2020 150Sx. It will be setup for 98-100 octane running a 92 non-eth + Sunoco 110 blend @ 40:1 w/Motul 800. I expect to have to go to a 520 main and a 35 pilot. Kelsey at RK said throw fuel at it till it can't take anymore then back off a little. I'll report back on how it worked out.

Hammer 663s
riv187 wrote:
Kelsey made me a one off insert for my 18 TC125,,,,,I like it. I run straight 110 race gas,,so it's high compression. I feel like it...
Kelsey made me a one off insert for my 18 TC125,,,,,I like it. I run straight 110 race gas,,so it's high compression. I feel like it improved the bottom and gave my bike a wider power delivery. Buds HGS pipe/silencer and stock porting. I only race MX,,but like a smooth pull coming out of tight slippery corners and RK Tek delivered.
That's exactly what I am looking for but on less octane. We are mx only too. Stock pipe, FMF shorty, stock porting/reeds. Might do reeds and porting when it's time for a replate on the jug.

Where did you end up with jetting?

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