2018 yz125 jetting help

Related:
Create New Tag

11/12/2018 10:43 AM

Jetting seems to be really good right off of the showroom floor. Added a FMF factory fatty and powercore silencer and it still runs great. MXA recommended to go up to the 440 main jet from the 430 that comes stock.

My next investment is going to be the vforce reed cage setup. This would make sense to go up a size in the main jet correct? More air would mean needing more fuel. Just hoping i have this correct.

Any advice appreciated, thanks

|

11/12/2018 10:48 AM

Save your money and run the stock reeds.


|

vomiting equals disqualification.

11/12/2018 2:28 PM

BR8ES wrote:

Save your money and run the stock reeds.


X2

Paw Paw

|

11/13/2018 3:27 PM

BR8ES wrote:

Save your money and run the stock reeds.


Paw Paw 271 wrote:

X2

Paw Paw

I disagree. I found the VForce 2 to be a welcome addition to my '01YZ125, and I also had one on the '15 I owned. As far as I know the '18 is fundamentally the same top end.

OP, you won't get any more power, but the initial throttle response and snap was noticeably better for me, anyway.
You will not need a bigger main jet nor needle adjustment, but you may need a bigger pilot or at least go out with your air screw.

If you are looking for more power, however, then I'd suggest going another route initially. The bikes I had reeds on were ported and had head mods. I added the reeds later and was happy.

|

Braaapin' aint easy.

11/13/2018 4:25 PM

BR8ES wrote:

Save your money and run the stock reeds.


Paw Paw 271 wrote:

X2

Paw Paw

Falcon wrote:

I disagree. I found the VForce 2 to be a welcome addition to my '01YZ125, and I also had one on the '15 I owned. As far as I know the '18 is fundamentally the same top end.

OP, you won't get any more power, but the initial throttle response and snap was noticeably better for me, anyway.
You will not need a bigger main jet nor needle adjustment, but you may need a bigger pilot or at least go out with your air screw.

If you are looking for more power, however, then I'd suggest going another route initially. The bikes I had reeds on were ported and had head mods. I added the reeds later and was happy.

Glad you were happy Falcon, I have never really noticed squat with VF reeds. I would spend that money on a good rear knobby, maybe a top end or rings or just riding fees. Maybe they would compliment other stuff, but as a stand alone... meh.

|

vomiting equals disqualification.

11/13/2018 11:03 PM

I felt like I got snappier throttle response on my yz125 when I fitted a set of vforce reeds.

|

11/16/2018 6:45 AM

BR8ES wrote:

Save your money and run the stock reeds.


Any knowledge on the lectron carb for this bike? Is a true plug and play item or is there some tinkering that needs to be done once its installed?

|

11/16/2018 4:11 PM
Edited Date/Time: 11/16/2018 4:13 PM

Telling ya, if you must experiment... go Smart Carb or Keihin(STIC is a nice add on too).

|

vomiting equals disqualification.

11/16/2018 4:12 PM

yamaharider471 wrote:

Any knowledge on the lectron carb for this bike? Is a true plug and play item or is there some tinkering that needs to be done once its installed?

More than likely there will be tuning... some have had great luck and others keep chasing their tail

|

vomiting equals disqualification.

11/17/2018 2:07 PM

BR8ES wrote:

Telling ya, if you must experiment... go Smart Carb or Keihin(STIC is a nice add on too).

Where do I find this smart carb?

|

11/17/2018 2:32 PM

BR8ES wrote:

Telling ya, if you must experiment... go Smart Carb or Keihin(STIC is a nice add on too).

yamaharider471 wrote:

Where do I find this smart carb?

Technology Elevated.... FB or website.

|

vomiting equals disqualification.

3/1/2019 5:56 PM

yamaharider471 wrote:

Where do I find this smart carb?

What did you end up doing? I'm curious to see how you liked the mod(s).

|

Holeshot Coffee Co.
Each bag sold donates $1 to Road2Recovery