Best mods to yz250 2smoker

Adam_Jones
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Adam_Jones
Edited Date/Time 11/22/2021 2:54pm
What are the best mods to the 06-21 yz250 two strokes?!?!?!
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Johnny Ringo
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Johnny Ringo 10/19/2021 5:38am
10/19/2021 5:38am
Rental 997’s
PC pipe and Shorty Exhaust
Vforce
Flywheel weight and/or Rekluse
Wider pegs if it’s older
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80sMXbadboy
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80sMXbadboy 10/19/2021 6:35am
10/19/2021 6:35am
Johnny Ringo wrote:
Rental 997’s
PC pipe and Shorty Exhaust
Vforce
Flywheel weight and/or Rekluse
Wider pegs if it’s older
Evidently Johnnys an educated man
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murph783
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murph783 10/19/2021 6:36am
10/19/2021 6:36am
Johnny Ringo wrote:
Rental 997’s
PC pipe and Shorty Exhaust
Vforce
Flywheel weight and/or Rekluse
Wider pegs if it’s older
What he said except I like Pro Taper EVO bars, my bend is Carmichael but take your pick. Slightly less vibration than with a crossbar? Maybe?

As for the flywheel weight I’ve tried a few and I like e GYTR one best for moto
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Moto Mofo
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Moto Mofo 10/19/2021 6:47am
10/19/2021 6:47am
I’ve been a YZ250 fanatic for many years, and have tried various different things.. I thought it was gonna be too good to be true, internet hype and bullshit, but the Apex head is hands down the best thing I’ve ever done to a YZ250. Makes a substantially larger difference than any exhaust and intake combination. That should be your first step, or at least after you get the suspension dialed in.
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Zesiger 112
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Zesiger 112 10/19/2021 6:50am
10/19/2021 6:50am
Old guys will tell you “gas and tires”

I will say DEP pipe and long silencer.
Honda or KTM front master cylinder and brake line.
Getting the head sorted out.
Wider oem pegs as mentioned
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queen of spodes 10/19/2021 7:04am
10/19/2021 7:04am
Why the head mod? Is it to make the power delivery more punchy? The last yz250 I rode (2016) felt butter smooth and had a linear power spread similar to but not the same as a 250f
Moto Mofo
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Moto Mofo 10/19/2021 7:12am
10/19/2021 7:12am Edited Date/Time 10/19/2021 7:14am
queen of spodes wrote:
Why the head mod? Is it to make the power delivery more punchy? The last yz250 I rode (2016) felt butter smooth and had a linear...
Why the head mod? Is it to make the power delivery more punchy? The last yz250 I rode (2016) felt butter smooth and had a linear power spread similar to but not the same as a 250f
Fixing the squish makes the bike much more consistent and even easier to jet. YZs are notorious for detonating on pump gas, and I ordered my heads to correct this. Differences in combustion dome shape/volume give different flavors of power delivery. The MX dome I received enhanced the stock power delivery, making it more linear and easier to ride… like it filled in some of the dip that some people complain about. As a result, it pulls smoother and stronger than the stock head.

Just have to decide what kind of power delivery you desire and what your fuel requirements are.
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Moto520
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Moto520 10/19/2021 8:00am
10/19/2021 8:00am
+1 on the Apex head. Cleans things up a bit. I would change it when you do your first piston. Stock exhaust is fine....aftermarket don't make that big of a difference (to me anyway). I don't do the flywheel weight....i like it punchy. Are the front disk brakes 270MM stock now? On mine i went with the Galfer SKW front disk to get better performance. Stock wheels are good........
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UGOTBIT
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UGOTBIT 10/19/2021 8:02am
10/19/2021 8:02am Edited Date/Time 10/19/2021 8:03am
Yes, having the squish corrected should be one of the first things considered. My experiences echo Moto Mofo's, I just had my stock head cut for $55 bucks.

Ringo's hit list is good also.
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stone881
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stone881 10/19/2021 8:06am
10/19/2021 8:06am
Adam_Jones wrote:
What are the best mods to the 06-21 yz250 two strokes?!?!?!
As others mentioned, every Yz 250 owner needs to check squish and most likely have their head milled. Once that is done, you can add the bolt ons...flywheel weight, reeds, pipe/silencer.
dmm698
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dmm698 10/19/2021 8:10am
10/19/2021 8:10am
For the 225$ it cost for an apex head, why not just spend the small bit extra and send the cylinder + head to tom morgan?
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dedi684
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dedi684 10/19/2021 8:11am
10/19/2021 8:11am
11 oz fww and sometimes a 50t
Yz229
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Yz229 10/19/2021 8:25am
10/19/2021 8:25am Edited Date/Time 10/19/2021 8:41am
-Tom Morgan Engine (YZ315 is really good, or even just head to make jetting easier)
-Suspension springs and valving for your weight and ability/riding style
-11oz fly wheel weight
-DEP Pipe (FMF for more low end) and long silencer
-Properly jetted Keihin with C12
-2008 CRF450 front brakes
-Good bar bend

Lots of other things, but the above are my favorites
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Falcon
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Falcon 10/19/2021 8:31am
10/19/2021 8:31am
-Get the brakes sorted
-Springs if you're heavy or fast
-FMF pipe/silencer if you like it torquier off the bottom, PC if like it to hit less and rev more
-Jetting
murph783
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murph783 10/19/2021 9:45am
10/19/2021 9:45am
Oh yeah I forgot- if it’s older upgrade the front brake. At least an oversized rotor and braided line, then possibly a Honda master cylinder.
Moto Mofo
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Moto Mofo 10/19/2021 9:57am
10/19/2021 9:57am Edited Date/Time 10/19/2021 9:58am
dmm698 wrote:
For the 225$ it cost for an apex head, why not just spend the small bit extra and send the cylinder + head to tom morgan?
That’s a good point. And TMR would be my first choice to send a cylinder and head to. But the Apex head modification to a stock head is only $70, if I remember correctly. That’s what I would’ve done, but decided to buy the complete head kit to try different domes, and figure out what I like.
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b8res
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b8res 10/19/2021 9:58am
10/19/2021 9:58am
My .02 as a 58+ vet racer:

270mm front rotor

PC Pipe w/ R304 silencer

14/50 gearing

GYTR FFW

OEM reed cage with spacer, Carbon Tech Pro reeds

110 Sunoco @ 32/1 Motul 800

I have a ZipTy pipe and silencer that I need to try.... I've heard there really good... more everywhere
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bacon
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bacon 10/19/2021 10:18am
10/19/2021 10:18am
+1 for the the head mod.

I bought an RK Tek head and it was the worth every penny.
sumdood
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sumdood 10/19/2021 10:37am
10/19/2021 10:37am
Flywheel weights ? Rekluse clutch ? aye aye aye...... facepalm Laughing
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Chippy
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Chippy 10/19/2021 10:37am
10/19/2021 10:37am
DEP pipes and T2 fuel. Big front rotor.
hanzhonglboy1
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hanzhonglboy1 10/19/2021 10:40am
10/19/2021 10:40am
Johnny Ringo wrote:
Rental 997’s
PC pipe and Shorty Exhaust
Vforce
Flywheel weight and/or Rekluse
Wider pegs if it’s older
This is a good list. Flywheel weight, I reccomend the GYTR heavy flywheel instead of the set screw steahly style. Boysen reeds work good too. Wider pegs of a later model yz250f or 450f are great. This thumpertalk thread has all the info you need for OEM peg interchangeability.

https://thumpertalk.com/forums/topic/790113-oem-foot-peg-options-for-yo…

I think rekluse is overkill. Flywheel weight reduces stalling at low rpms and the clutch pull on these is already so easy.

The aftermarket renthal fatbar does help a bit with vibration, but mine is still a pain in the ass that put my hand to sleep. I do need to hold on looser (better w/ less death grip) but I do plan on some rubber bar mounts to help more. Rubber bar mounts are no where near as important as the list ringo posted.
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hanzhonglboy1
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hanzhonglboy1 10/19/2021 10:42am
10/19/2021 10:42am
UGOTBIT wrote:
Yes, having the squish corrected should be one of the first things considered. My experiences echo Moto Mofo's, I just had my stock head cut for...
Yes, having the squish corrected should be one of the first things considered. My experiences echo Moto Mofo's, I just had my stock head cut for $55 bucks.

Ringo's hit list is good also.
who did your cyl. head. Thinking of sending mine to Tom Morgan for a pump gas correction as all I run in pump swill.
dmm698
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dmm698 10/19/2021 12:00pm
10/19/2021 12:00pm Edited Date/Time 10/19/2021 12:03pm
UGOTBIT wrote:
Yes, having the squish corrected should be one of the first things considered. My experiences echo Moto Mofo's, I just had my stock head cut for...
Yes, having the squish corrected should be one of the first things considered. My experiences echo Moto Mofo's, I just had my stock head cut for $55 bucks.

Ringo's hit list is good also.
hanzhonglboy1 wrote:
who did your cyl. head. Thinking of sending mine to Tom Morgan for a pump gas correction as all I run in pump swill.
I did my stock head myself to get the correct squish, followed with some massaging to the bowl to get most of the volume back that I lost when removing material from the face.
Then I decided to have some cylinder work done, and after 6 months of dealing with the infamous Harris peformance, I finally received my stuff back and it went straight to Tom who had it turned around in a week.

Somebody like apex or Tom morgan is likely doing this with a different profile in the bowl portion, as well as maybe altering the angle of the outer "squish" band. Thus the reason for different domes ect. Plenty of places will do it, seems like the going rate is about 75 bucks.
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murph783
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murph783 10/19/2021 12:08pm
10/19/2021 12:08pm
How does one measure and adjust the squish? 🤔
UGOTBIT
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UGOTBIT 10/19/2021 1:24pm
10/19/2021 1:24pm Edited Date/Time 10/19/2021 1:34pm
UGOTBIT wrote:
Yes, having the squish corrected should be one of the first things considered. My experiences echo Moto Mofo's, I just had my stock head cut for...
Yes, having the squish corrected should be one of the first things considered. My experiences echo Moto Mofo's, I just had my stock head cut for $55 bucks.

Ringo's hit list is good also.
hanzhonglboy1 wrote:
who did your cyl. head. Thinking of sending mine to Tom Morgan for a pump gas correction as all I run in pump swill.
Ken O Connor Racing did mine, great guy to deal with.

Jetting with the Zook needles is nice also
Tracktor
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Tracktor 10/22/2021 11:37am
10/22/2021 11:37am
GYTR FWW
Head mod
STIC Metering block
Equals 450 like smooth power with phenomenal over-rev....
RCMXracing
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RCMXracing 10/22/2021 1:01pm
10/22/2021 1:01pm
For motocross do not like flywheel weights. Tried a couple. Bike loses zippy free flowing feel that makes 2 strokes great.

Boyesen Rad valve, FMF, 50:50 VP110:pump, 40:1 927. She rips.
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Falcon
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Falcon 10/22/2021 1:07pm
10/22/2021 1:07pm
sumdood wrote:
Flywheel weights ? Rekluse clutch ? aye aye aye...... facepalm Laughing
Don't hate on the guys who ride 4-strokes and just don't understand. Laughing
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