2021 yz250f second injector

Christopher Moore
Just switched to Yamahas from husky. In 2019 for outdoors I had a full twisted bike, and im looking to budget build my Yamaha for outdoors this summer. Any leads on getting a kit?
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Zycki11
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Zycki11 2/28/2021 6:34pm
2/28/2021 6:34pm Edited Date/Time 2/28/2021 7:12pm
Twisted Development does dual injectors, remaps , ecu replacement, motor work etc.
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wrc777
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wrc777 2/28/2021 7:36pm
2/28/2021 7:36pm
I see Suzuki and Kawi have the 2nd injector standard. What benefit does it give?
Zycki11
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Zycki11 2/28/2021 7:41pm
2/28/2021 7:41pm
wrc777 wrote:
I see Suzuki and Kawi have the 2nd injector standard. What benefit does it give?
Fuel injection with a single injector starts to lose some gusto on the top end. The 2nd injector makes sure it’s a consistent pressure throughout the range and gives more power up top in the rpms.
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sgrimmxdad
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sgrimmxdad 3/1/2021 4:57am
3/1/2021 4:57am
Zycki11 wrote:
Twisted Development does dual injectors, remaps , ecu replacement, motor work etc.
This, I wanna buy a YZ250F just to do this!! Sick mod!
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AH387
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AH387 3/1/2021 7:50am
3/1/2021 7:50am
I think TD does that set-up on the ClubMX bikes. I swore on Instagram they posted a video of them revving the bike and you could see the 2nd injector inside the boot spray. The bike sounded so sick (but even the stock one sounds pretty nasty, so maybe not a good judge lol.) Regardless a cool set-up for sure.
Motofinne
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Motofinne 3/1/2021 7:58am
3/1/2021 7:58am
AH387 wrote:
I think TD does that set-up on the ClubMX bikes. I swore on Instagram they posted a video of them revving the bike and you could...
I think TD does that set-up on the ClubMX bikes. I swore on Instagram they posted a video of them revving the bike and you could see the 2nd injector inside the boot spray. The bike sounded so sick (but even the stock one sounds pretty nasty, so maybe not a good judge lol.) Regardless a cool set-up for sure.
It would be so fun to try a race bike like this.

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eric513anderson 3/1/2021 2:45pm
3/1/2021 2:45pm
AH387 wrote:
I think TD does that set-up on the ClubMX bikes. I swore on Instagram they posted a video of them revving the bike and you could...
I think TD does that set-up on the ClubMX bikes. I swore on Instagram they posted a video of them revving the bike and you could see the 2nd injector inside the boot spray. The bike sounded so sick (but even the stock one sounds pretty nasty, so maybe not a good judge lol.) Regardless a cool set-up for sure.
Motofinne wrote:
It would be so fun to try a race bike like this.

My god that’s nasty!
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yzf162
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yzf162 3/1/2021 4:57pm
3/1/2021 4:57pm
Bundy Built does them as well. If your going with a get ecu i might be able to find you a air box with the kit already to go installed. You would just need a get ecu
Premix
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Premix 3/1/2021 5:22pm
3/1/2021 5:22pm Edited Date/Time 3/1/2021 5:23pm
DH1 mods. Brandon has done several motors for me.
Johnny Depp
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Johnny Depp 3/1/2021 6:00pm
3/1/2021 6:00pm
It is also std. on Beta 4t’s for a few years now. Better mpg and power across the range.
#434
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#434 3/1/2021 11:08pm
3/1/2021 11:08pm
wrc777 wrote:
I see Suzuki and Kawi have the 2nd injector standard. What benefit does it give?
Zycki11 wrote:
Fuel injection with a single injector starts to lose some gusto on the top end. The 2nd injector makes sure it’s a consistent pressure throughout the...
Fuel injection with a single injector starts to lose some gusto on the top end. The 2nd injector makes sure it’s a consistent pressure throughout the range and gives more power up top in the rpms.
It‘s not the pressure. Otherwise you would need a second pump as well.
With higher rpm the air velocity in the intake increases and the fuel has less time to atomise before being burnt. By adding a second injector further upstream you can counter that. With rising rpm the system switches more and more to the second injector.
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dirtbikefreak 1/24/2022 5:48pm
1/24/2022 5:48pm
wrc777 wrote:
I see Suzuki and Kawi have the 2nd injector standard. What benefit does it give?
Zycki11 wrote:
Fuel injection with a single injector starts to lose some gusto on the top end. The 2nd injector makes sure it’s a consistent pressure throughout the...
Fuel injection with a single injector starts to lose some gusto on the top end. The 2nd injector makes sure it’s a consistent pressure throughout the range and gives more power up top in the rpms.
Any of you have experience with the 2nd injector kit from TD?

I am getting my bike ready for the season and i am on the edge to order the kit, it would be nice to hear some feedback....

I have already twin air cage, crm compositi airbox cover, FMF and TD tuned vortex ecu.... Bike rips just needs little more top end..

Christopher Moore 1/24/2022 7:36pm
1/24/2022 7:36pm
wrc777 wrote:
I see Suzuki and Kawi have the 2nd injector standard. What benefit does it give?
Zycki11 wrote:
Fuel injection with a single injector starts to lose some gusto on the top end. The 2nd injector makes sure it’s a consistent pressure throughout the...
Fuel injection with a single injector starts to lose some gusto on the top end. The 2nd injector makes sure it’s a consistent pressure throughout the range and gives more power up top in the rpms.
dirtbikefreak wrote:
Any of you have experience with the 2nd injector kit from TD? I am getting my bike ready for the season and i am on the...
Any of you have experience with the 2nd injector kit from TD?

I am getting my bike ready for the season and i am on the edge to order the kit, it would be nice to hear some feedback....

I have already twin air cage, crm compositi airbox cover, FMF and TD tuned vortex ecu.... Bike rips just needs little more top end..

Brandon at DH1 has in my opinion a better setup and is a quarter of the price
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Jack_Wagon
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Jack_Wagon 1/24/2022 8:04pm
1/24/2022 8:04pm
yzf162 wrote:
Bundy Built does them as well. If your going with a get ecu i might be able to find you a air box with the kit...
Bundy Built does them as well. If your going with a get ecu i might be able to find you a air box with the kit already to go installed. You would just need a get ecu
I have a GET ecu that is 2nd injector compatible I'll sell for $450
Austin_Rankin 1/24/2022 9:20pm
1/24/2022 9:20pm
You need to upgrade the rod, and piston, not the compression just the strength of the piston, then if your gonna do a vortex ecu you will need valve springs to keep up with the igntion, and a shit load of cam chains, may even look into the tokyo mods cam chain manual tensioner..


If running the dual in jector setup your required to run vortex ecu,

If running vortex ecu your required to run the valve springs,

If running high comp piston, you will be required to upgrade the connecting rod.

Its alot of money and its nuts,

The husky or ktm has everything. That your adding to this blue one stock, except for the ecu.
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LLOYD22
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LLOYD22 12/13/2022 7:51pm
12/13/2022 7:51pm
wrc777 wrote:
I see Suzuki and Kawi have the 2nd injector standard. What benefit does it give?
Zycki11 wrote:
Fuel injection with a single injector starts to lose some gusto on the top end. The 2nd injector makes sure it’s a consistent pressure throughout the...
Fuel injection with a single injector starts to lose some gusto on the top end. The 2nd injector makes sure it’s a consistent pressure throughout the range and gives more power up top in the rpms.
dirtbikefreak wrote:
Any of you have experience with the 2nd injector kit from TD? I am getting my bike ready for the season and i am on the...
Any of you have experience with the 2nd injector kit from TD?

I am getting my bike ready for the season and i am on the edge to order the kit, it would be nice to hear some feedback....

I have already twin air cage, crm compositi airbox cover, FMF and TD tuned vortex ecu.... Bike rips just needs little more top end..

yes and it helps power tremendously 

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