KTM 125 Engine Builder

Alan Greenwell
Edited Date/Time 9/9/2021 10:58am
My son will be moving up from the supermini to a 125 in the near future.

Was curious who was building a good quality engine package?

Looking for a solid package, not a high strung time bomb.

Thanks for your help
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Rickyisms
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Rickyisms 6/14/2020 6:24pm
6/14/2020 6:24pm Edited Date/Time 6/14/2020 6:24pm
Pro circuit built my 16 125SX and it has been bullet proof, top end every 15 or so hours and has never made me push it back to the truck in 150 hours. Broke it down a couple weeks ago cause the crank bearing started raising hell. Never getting rid of this thing.
2
Alan Greenwell 6/14/2020 6:32pm
6/14/2020 6:32pm
Rickyisms wrote:
Pro circuit built my 16 125SX and it has been bullet proof, top end every 15 or so hours and has never made me push it...
Pro circuit built my 16 125SX and it has been bullet proof, top end every 15 or so hours and has never made me push it back to the truck in 150 hours. Broke it down a couple weeks ago cause the crank bearing started raising hell. Never getting rid of this thing.
How is the performance gain over stock?
Did you see the gains low/mid/high in the rpm range?

When I spoke to Pro Circuit last week they would not provide any dyno horsepower improvement numbers for their package.

Which seemed a little odd.

Thanks
CarlinoJoeVideo
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CarlinoJoeVideo 6/14/2020 8:49pm
6/14/2020 8:49pm
Pro circuit or Twisted Development would be my call for 2 strokes. Twisted does many of the top amateur riders.
1
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Chris99Flannery 6/15/2020 5:31am
6/15/2020 5:31am Edited Date/Time 6/15/2020 5:34am
Rickyisms wrote:
Pro circuit built my 16 125SX and it has been bullet proof, top end every 15 or so hours and has never made me push it...
Pro circuit built my 16 125SX and it has been bullet proof, top end every 15 or so hours and has never made me push it back to the truck in 150 hours. Broke it down a couple weeks ago cause the crank bearing started raising hell. Never getting rid of this thing.
Alan Greenwell wrote:
How is the performance gain over stock? Did you see the gains low/mid/high in the rpm range? When I spoke to Pro Circuit last week they...
How is the performance gain over stock?
Did you see the gains low/mid/high in the rpm range?

When I spoke to Pro Circuit last week they would not provide any dyno horsepower improvement numbers for their package.

Which seemed a little odd.

Thanks
Because PC theyre selling nothing special. Its already the best 125 engine around. Dont need porting. Get your ktm head set up and know your jetting. Maybe ignition set for race fuel if youre serious.
Do the proper 125 race maintenance through the season. Reeds, pistons, cranks etc.
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The Shop

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2F4A
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2F4A 6/15/2020 6:00am
6/15/2020 6:00am
Alan Greenwell wrote:
My son will be moving up from the supermini to a 125 in the near future. Was curious who was building a good quality engine package...
My son will be moving up from the supermini to a 125 in the near future.

Was curious who was building a good quality engine package?

Looking for a solid package, not a high strung time bomb.

Thanks for your help
I don't know how much the AMA technical regulations are different from FIM technical regulations but you might want to look in to EHR Tuning in The Netherlands. Yes you have to ship your engine(s) overseas but you will have a top notch package for around +/- 2100 dollars.

Eddy's service is well known on the european continent with multiple european and world championships in multiple classes.

You can get in touch with him via www.ehr-tuning.com

Feel free to ask Wink

1
Factor E
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Factor E 6/15/2020 8:13am
6/15/2020 8:13am
Lynks Racing
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sandman768
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sandman768 6/15/2020 8:53am
6/15/2020 8:53am
WMR in Stuart, Florida is a very good KTM shop also.
2
Tracktor
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Tracktor 6/15/2020 11:33am
6/15/2020 11:33am
We have tested two full mod packages, one a full PC mod, against our stock bike with 38mm Keihin with STIC Metering block. The STIC bike was preferred every single time. All bikes are 2017/18 TC125's...........
4
Rickyisms
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Rickyisms 6/15/2020 5:37pm
6/15/2020 5:37pm
Rickyisms wrote:
Pro circuit built my 16 125SX and it has been bullet proof, top end every 15 or so hours and has never made me push it...
Pro circuit built my 16 125SX and it has been bullet proof, top end every 15 or so hours and has never made me push it back to the truck in 150 hours. Broke it down a couple weeks ago cause the crank bearing started raising hell. Never getting rid of this thing.
Alan Greenwell wrote:
How is the performance gain over stock? Did you see the gains low/mid/high in the rpm range? When I spoke to Pro Circuit last week they...
How is the performance gain over stock?
Did you see the gains low/mid/high in the rpm range?

When I spoke to Pro Circuit last week they would not provide any dyno horsepower improvement numbers for their package.

Which seemed a little odd.

Thanks
Everything top to bottom was ported, polished, cases were matched, and the carb was bored. Squish is corrected and I run 110 at 32:1 with Castor 927. Really strong bottom for a 125 with an easy transition from mid to top end, once you’re in the higher RPM range the bike just wants to keep screaming.
1
chickenstrips721 6/27/2020 12:25pm
6/27/2020 12:25pm
I went through Munn racing in Waco Texas, I’ve had nothing but good luck with my motors. Port, polish, VMH 12 degree domed piston and head, lectron carb. Bike is insane now
2
Matt Fisher
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Matt Fisher 6/27/2020 7:54pm
6/27/2020 7:54pm
I just bought a KTM 125 with a motor built by Lynk's Racing, and it rips. I then contacted the builder about having a head insert modified for 100LL instead of C12, and he was responsive and professional. Would recommend.

I also just had my YZ250 cylinder ported by Tom Morgan Racing. Very professional. Great communication via both phone and email. Returned cylinder had damn near a small binder on setup and suggestions. I haven't finished putting the bike together so no ride report, but would recommend Tom as well.
2
brocsdad
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brocsdad 7/22/2020 11:15am
7/22/2020 11:15am
Terry Varner is a 2-stroke guru and R&D just built a project KTM 125 for one of the magazines
4
brocsdad
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brocsdad 7/22/2020 11:16am
7/22/2020 11:16am
Alan Greenwell wrote:
My son will be moving up from the supermini to a 125 in the near future. Was curious who was building a good quality engine package...
My son will be moving up from the supermini to a 125 in the near future.

Was curious who was building a good quality engine package?

Looking for a solid package, not a high strung time bomb.

Thanks for your help
2F4A wrote:
I don't know how much the AMA technical regulations are different from FIM technical regulations but you might want to look in to EHR Tuning in...
I don't know how much the AMA technical regulations are different from FIM technical regulations but you might want to look in to EHR Tuning in The Netherlands. Yes you have to ship your engine(s) overseas but you will have a top notch package for around +/- 2100 dollars.

Eddy's service is well known on the european continent with multiple european and world championships in multiple classes.

You can get in touch with him via www.ehr-tuning.com

Feel free to ask Wink

is that a dyno for a YZ 125?
1
dave_daum
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dave_daum 7/25/2020 7:21am
7/25/2020 7:21am Edited Date/Time 7/25/2020 7:24am
Tracktor wrote:
We have tested two full mod packages, one a full PC mod, against our stock bike with 38mm Keihin with STIC Metering block. The STIC bike...
We have tested two full mod packages, one a full PC mod, against our stock bike with 38mm Keihin with STIC Metering block. The STIC bike was preferred every single time. All bikes are 2017/18 TC125's...........
I swapped the stock carb for a 39mm Keihin pwk carb with a #7 slide, proper jetting, Boyesen reeds, and an RK head insert. My KTM is now a top tier racer that will run with and beat the competition. Total time and cost were less two hours labor and less than $500.00 US Dollars. Best of all it never breaks down. Put the money into the suspension and make sure your son uses all the throttle.
OLDMOTO
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OLDMOTO 7/25/2020 11:33am
7/25/2020 11:33am
brocsdad wrote:
Terry Varner is a 2-stroke guru and R&D just built a project KTM 125 for one of the magazines
Only takes 2 years and a lawsuit to get your parts back.
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brocsdad
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brocsdad 7/27/2020 6:44am
7/27/2020 6:44am
brocsdad wrote:
Terry Varner is a 2-stroke guru and R&D just built a project KTM 125 for one of the magazines
OLDMOTO wrote:
Only takes 2 years and a lawsuit to get your parts back.
I'm sorry to hear you had issues with Terry. He has always had my motors back within a month and they ripped!
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15tc150
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15tc150 8/30/2020 7:47pm
8/30/2020 7:47pm
VHM from the Netherlands sells entire engine kits, pro circuit gets their cranks from them, so I figure it’s gotta be top notch stuff
jday1024
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jday1024 8/21/2021 5:18am
8/21/2021 5:18am
Tracktor wrote:
We have tested two full mod packages, one a full PC mod, against our stock bike with 38mm Keihin with STIC Metering block. The STIC bike...
We have tested two full mod packages, one a full PC mod, against our stock bike with 38mm Keihin with STIC Metering block. The STIC bike was preferred every single time. All bikes are 2017/18 TC125's...........
dave_daum wrote:
I swapped the stock carb for a 39mm Keihin pwk carb with a #7 slide, proper jetting, Boyesen reeds, and an RK head insert. My KTM...
I swapped the stock carb for a 39mm Keihin pwk carb with a #7 slide, proper jetting, Boyesen reeds, and an RK head insert. My KTM is now a top tier racer that will run with and beat the competition. Total time and cost were less two hours labor and less than $500.00 US Dollars. Best of all it never breaks down. Put the money into the suspension and make sure your son uses all the throttle.
Mind sharing where I can purchase those things for my 2022 125, got Mikuni decent but I’m running c-12 and would like to know the jetting for keihin and what to purchase. Thanks

Pit Row

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swatdoc
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swatdoc 9/8/2021 10:22pm
9/8/2021 10:22pm
Tracktor wrote:
We have tested two full mod packages, one a full PC mod, against our stock bike with 38mm Keihin with STIC Metering block. The STIC bike...
We have tested two full mod packages, one a full PC mod, against our stock bike with 38mm Keihin with STIC Metering block. The STIC bike was preferred every single time. All bikes are 2017/18 TC125's...........
dave_daum wrote:
I swapped the stock carb for a 39mm Keihin pwk carb with a #7 slide, proper jetting, Boyesen reeds, and an RK head insert. My KTM...
I swapped the stock carb for a 39mm Keihin pwk carb with a #7 slide, proper jetting, Boyesen reeds, and an RK head insert. My KTM is now a top tier racer that will run with and beat the competition. Total time and cost were less two hours labor and less than $500.00 US Dollars. Best of all it never breaks down. Put the money into the suspension and make sure your son uses all the throttle.
jday1024 wrote:
Mind sharing where I can purchase those things for my 2022 125, got Mikuni decent but I’m running c-12 and would like to know the jetting...
Mind sharing where I can purchase those things for my 2022 125, got Mikuni decent but I’m running c-12 and would like to know the jetting for keihin and what to purchase. Thanks
http://www.sticsupertorque.com/
Tracktor
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Tracktor 9/9/2021 10:58am
9/9/2021 10:58am
dave_daum wrote:
I swapped the stock carb for a 39mm Keihin pwk carb with a #7 slide, proper jetting, Boyesen reeds, and an RK head insert. My KTM...
I swapped the stock carb for a 39mm Keihin pwk carb with a #7 slide, proper jetting, Boyesen reeds, and an RK head insert. My KTM is now a top tier racer that will run with and beat the competition. Total time and cost were less two hours labor and less than $500.00 US Dollars. Best of all it never breaks down. Put the money into the suspension and make sure your son uses all the throttle.
jday1024 wrote:
Mind sharing where I can purchase those things for my 2022 125, got Mikuni decent but I’m running c-12 and would like to know the jetting...
Mind sharing where I can purchase those things for my 2022 125, got Mikuni decent but I’m running c-12 and would like to know the jetting for keihin and what to purchase. Thanks
swatdoc wrote:
http://www.sticsupertorque.com/
That's the spot for the Metering block. You can also pick up a used carb off Ebay as they cam stock on a bunch of different bikes over they years & just put the STIC in that. Saves a few bucks......

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