4-stroke Motor Builders

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7/22/2020 11:34 AM

I have a friend looking to build his son a National Level Motor for his YZ 250F. The kid is injured right now and will miss Loretta’s but should be riding again soon. They had used a builder from one of the training facilities but they epoxy broke loose and trashed the motor. So needless to say they are looking for another builder.

I wanted to get some opinions of the 4-stroke builders and your experience with them. Some of the names that come to mind are listed below.
Ed Torrance
XPR Motorsports
Bundy Built
Twisted Development
Tom Zont Racing
C4MX
Terry Varner (I know his 2-stroke motors are great)

Has anyone dyno’d the GYTR setup in comparison?

Thanks in advance!

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7/22/2020 11:56 AM

Sorry to hear about your kid getting hurt, that's a bummer. I know someone who was really happy with the GYTR kit in his YZ250f. If it were me I would either go with Twisted or GYTR. Though I've heard all good things about the people you listed above except for Varner.

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7/22/2020 11:59 AM

XPR or Twisted Development

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7/22/2020 11:59 AM

Matt over at http://www.provenmoto.com/ is your guy. Used to wrench for the TLD team

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7/22/2020 12:50 PM

LumpDog841 wrote:

Sorry to hear about your kid getting hurt, that's a bummer. I know someone who was really happy with the GYTR kit in his ...more

I have used Varner for all of my 2-stroke motors and they were fast and reliable.

What did you hear?

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7/22/2020 12:57 PM

brocsdad wrote:

I have used Varner for all of my 2-stroke motors and they were fast and reliable.

What did you hear?

https://www.vitalmx.com/forums/Moto-Related,20/Varner-Motorsports-issues,1375078

Numerous people waiting a long time.

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7/22/2020 1:53 PM

LumpDog841 wrote:

Sorry to hear about your kid getting hurt, that's a bummer. I know someone who was really happy with the GYTR kit in his ...more

brocsdad wrote:

I have used Varner for all of my 2-stroke motors and they were fast and reliable.

What did you hear?

Wow!

Terry has taken a couple weeks longer with my motors in the past but nothing too crazy. I can tell you this the Tom Morgan YZ 250 runs good but it's not in the same league as Terry's YZ.

I just had a friend send their KTM 150 to Varner back in April and he turned it in a week. The dad and son both had 150's and the dad bought a KTM 350. After riding the Varner 150 he said he should have kept his 150 and had it modded. He used the same specs from the motor he just did for Jeff Emig. Alessi also sent YZ 125 motors to several builders and chose the Varner mod.

It sounds like he got behind or needs some help. I hate reading this because the guy is a 2-stroke guru.



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7/22/2020 1:56 PM
Edited Date/Time: 7/22/2020 1:58 PM

LumpDog841 wrote:

Sorry to hear about your kid getting hurt, that's a bummer. I know someone who was really happy with the GYTR kit in his ...more

Coincidentally my kid did get hurt but the motor is for a friend's kid. The parents kinda lean on me for advice.

They have the GYTR kit on one of the bikes now and it runs good but they are looking for a national level motor.

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7/22/2020 1:59 PM

newmason wrote:

Matt over at http://www.provenmoto.com/ is your guy. Used to wrench for the TLD team

Have you personally used the Proven Motors?

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7/22/2020 2:04 PM
Edited Date/Time: 7/22/2020 2:20 PM

I'm anal as hell about my bikes. I'm a big fan of and have personally used TZR Racing for several projects. Last month I had them dyno tune and create a motor for my CRF250. It's awesome!

Good people

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7/22/2020 2:08 PM

id use XPR or Twisted only...

I trust those dudes. And they are honest blue collar working man type of dudes.

I personally have a built yz250f from Twisted and its a really strong motor.. your kid will be able to pull holeshots on gates with 450's... As long as the kid isnt 200+lbs.. i pull holeshots in the vet class on my 250F at 200lbs, but were fat slow older have jobs and a house kind of dudes..

A national level motor will run you about 8-10K, or a big bore kit for the practice bike(about 2500-3000) which is very similar power wise to the race bike.


Twisted Development built the ClubMX engines this year, and those were by far the fastest privateer bikes on the track, id say every bit as fast as every factory bike, outside of maybe a 1-2% advantage by the Star bikes due to Yamaha Engineers.

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7/22/2020 2:13 PM
Edited Date/Time: 7/22/2020 2:14 PM

TSCHAM101 wrote:

id use XPR or Twisted only...

I trust those dudes. And they are honest blue collar working man type of dudes.

I personally ...more

I have a call into Twisted for pricing.

Do they offer a big bore kit? Also how often do you need to rebuild it?

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7/22/2020 2:13 PM

TLR in florida Todd is the man

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7/22/2020 2:31 PM

pete24 wrote:

TLR in florida Todd is the man

RT... Todd at TLR knows his stuff. I’ve used him for my SX bikes in the past and will absolutely never go anywhere else.

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7/23/2020 2:07 AM

I use TLR Todd as well. He’s ported my 450 and my KX250 2 stroke cylinder. After he made a custom map for my vortex I gained 5.5hp more then the default maps. I’m going to use him all the time especially since he’s only 1.5 hrs from me.

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7/23/2020 6:57 AM

Frenchie at C4MX. Very knowledgeable guy and reasonable. Motor will be very fast as well

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thereal1six

7/23/2020 7:08 AM

Racer16 wrote:

Frenchie at C4MX. Very knowledgeable guy and reasonable. Motor will be very fast as well

His phone number is disconnected.

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7/23/2020 7:13 AM

pete24 wrote:

TLR in florida Todd is the man

I agree with this.

Todd is a low key mellow guy, but he gets the job done. Known him for years and he builds some fast, strong and reliable stuff.

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Make sure you downvote!

7/23/2020 7:37 AM

brocsdad wrote:

I have a friend looking to build his son a National Level Motor for his YZ 250F. The kid is injured right now and will miss ...more

I’d talk to John Turner at MMR he does great work and stands behind his motors. He has built two race motors for me to race at the pro nationals and they are unreal! Tell him Jake Bork sent you. (951) 235-2616 is his number

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7/23/2020 8:06 AM

newmason wrote:

Matt over at http://www.provenmoto.com/ is your guy. Used to wrench for the TLD team

brocsdad wrote:

Have you personally used the Proven Motors?

Yup, had Matt rebuild my bottom end on my YZ250

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7/23/2020 8:25 AM

brocsdad wrote:

His phone number is disconnected.

I can get you in contact with him.

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thereal1six

7/23/2020 8:37 AM

brocsdad wrote:

I have a friend looking to build his son a National Level Motor for his YZ 250F. The kid is injured right now and will miss ...more

One of my coworkers will do absolutely anything you guys need. We actually had to lay him off due to covid, and he could probably use the work. His Resume is 20 miles long, and maybe some of the guys know him. He has actually relocated to Dalton GA Photo
This is him on Scott Russell’s bike. I’m happy to get you in contact if you like.

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7/23/2020 8:40 AM

Racetech

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Unleaded tastes a little tangy. Supreme is kinda sour, and diesel tastes pretty good.

7/23/2020 9:20 AM

TSCHAM101 wrote:

id use XPR or Twisted only...

I trust those dudes. And they are honest blue collar working man type of dudes.

I personally ...more

brocsdad wrote:

I have a call into Twisted for pricing.

Do they offer a big bore kit? Also how often do you need to rebuild it?

Yes, thats where i did mine.

and Rebuild depends on how you ride the bike.. generally speaking the same as stock intervals.. so if you hammer stock pistons at 20hrs. i would do a piston at 20 hours on the big bore too..

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7/23/2020 2:27 PM

Twisted Development

http://www.td-racing.com

Period

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Nobody ever told me, I found out for myself. You've got to believe in foolish miracles. It's not how you play the game, it's if you win or lose. You can choose. Don't confuse. Win or lose. It's up to you!

7/23/2020 8:41 PM

Racer16 wrote:

Frenchie at C4MX. Very knowledgeable guy and reasonable. Motor will be very fast as well

brocsdad wrote:

His phone number is disconnected.

Racer16 wrote:

I can get you in contact with him.

I’m leaning towards Twisted but send me his number.

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7/23/2020 9:28 PM

Dan Lamey (Dasa Racing) probably knows more about a YZ250F than anybody.

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7/23/2020 10:17 PM

brocsdad wrote:

I have a friend looking to build his son a National Level Motor for his YZ 250F. The kid is injured right now and will miss ...more

JM Racing out of Houston. He’s built motors for Canard and others as they were coming through the ranks to factory rides. He is familiar with with the YZ engine as well, getting just shy of 50hp out of a YZ250f for a rider that will be running 250A at LL. Worth a phone call at the very least to go up against the list of names you have.

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7/24/2020 11:30 AM

TOM ZONT only way to go
give me call TZR

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7/25/2020 8:07 AM

TSCHAM101 wrote:

id use XPR or Twisted only...

I trust those dudes. And they are honest blue collar working man type of dudes.

I personally ...more

+1 for Twisted and XPR.

I know Twisted has a lot of time building race Yz250Fs. I used them on KTM builds.

I’ve also had XPR do ECU work in my Honda.

Both groups are very honest and reliable.

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