# Jetting for Yamaha YZ 2T bikes — Max performance for your YZ

> Yamaha YZ 2-stroke carburetor jetting optimization tool. (iPhone/iPad app by ISEnet.)

- Source: https://appshunter.io/ios/app/jetting-for-yamaha-yz-2t-bikes/id978505790 (this page in markdown: same URL + `.md`)
- Developer: [ISEnet](https://appshunter.io/developer/811255764)
- Category: Sports, Utilities
- Price: $3.99
- Rating: 5.00/5 from 3 App Store ratings · 20 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 2 MB
- Languages: American English, French (France), German (Germany), Italian, European Portuguese, Russian, European Spanish
- Released: 2015-04-01
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/jetting-for-yamaha-yz-2t-bikes/id978505790/reviews.md

## What is Jetting for Yamaha YZ 2T bikes?

This app helps you jet your 2-stroke Yamaha YZ (PW 50, PW 80, YZ 65, YZ 80, YZ 85, YZ 85 LW, YZ 125, YZ 125 X, YZ 250, YZ 250 X) and get the most out of it. From the temperature, altitude, humidity, atmospheric pressure and the oil-to-fuel ratio it works out the jetting recommended for your exact model.

To get the weather values the app can use the location service and the data connection: it takes your position and altitude, queries the nearest public weather station and brings back its readings. It also works with no GPS and no data, entering the weather by hand.

The app has 4 tabs:
- Results: the recommended main jet, needle type and clip position, pilot jet and air screw turns for the conditions and the bike you set, plus air density and density altitude. It has fine tuning per circuit —high, mid and low— to match the character of one particular engine.
- Conditions: temperature, altitude, pressure and humidity. Type them in, or pull them from the nearest weather station with one tap, without leaving the screen.
- Engine: year, region, model and oil mix ratio. The carburettor is not a choice: the year, region and model determine it.
- Logbook: saves each ride with the bike, the weather and what the app recommended, so you can note afterwards what you actually fitted and how it went, rated per circuit. Export it to CSV or share a copy to move it to another phone; importing never deletes anything.

Units: metres and feet for altitude, ºC and ºF for temperature, mb, hPa, mmHg and inHg for pressure, and kg/m³, lb/ft³ and lb/gal for air density.

No ads, no tracking and no account.

Yamaha YZ models that are included:
- PW50 from 1995 to 2027.
- PW80 from 1995 to 2024.
- YZ65 from 2018 to 2027.
- YZ80 from 1995 to 2001.
- YZ85 from 2002 to 2027.
- YZ85LW from 2022 to 2027.
- YZ125 from 1995 to 2027.
- YZ125X from 2016 to 2027.
- YZ250 from 1995 to 2027.
- YZ250X from 2016 to 2027.

## Key features

- Carburetor jetting recommendations
- Weather condition adaptation
- GPS for altitude and location
- Manual weather data input
- Support for multiple YZ models
- Adjustable measurement units

## Chart rankings

- #163 in Top Paid · Sports (US App Store)

## Recent user reviews (10 of 20)

All indexed reviews: https://appshunter.io/ios/app/jetting-for-yamaha-yz-2t-bikes/id978505790/reviews.md

### 3/5 — Ok setting suggestions

*2023-05-02*

But the pilot jet recommendations are far off, ie 5000 to 10,000 asl only recommends a turn out on a/s when I’ve found 2 sizes down on pilot is necessary, seems to recommend rich settings here. It’s difficult to input elevation with the keyboard being in the way.

**Developer response:** Hello, the issue with the elevation input is solved since last update.
In the case of the pilot jet recommendation, our model tries to enrich at low in order to be safe (most seizes are after WOT and suddenly close throttle), and that let us put a one size leaner main jet to maximize power.

### 1/5 — Please issue refund.

*2023-04-17*

This app is glitchy.  It won’t let me input elevation and doesn’t have all the info for my bike.

**Developer response:** Please send us an email to mobile@isenet.es.
We've updated the app in order to solve this issue, but in the case it's not ok, we'll refund you.

Best regards.

### 5/5 — Spot on…!!!

*2023-01-28*

I use this app for all my two strokes. I live in Reno Nevada and ride Nor Cal MX tracks often. The jetting recommendations is always spot on for me. 

More riding and less jet changes. 😎

### 3/5 — Need updates!!!

*2022-10-22*

Come on man we’re riding 2023 bikes and this app is still back at 2021 please up out an update already

### 5/5 — 1998 jetting

*2021-03-12*

After playing around with the fine tuning I can re-jet with local weather data and the bike runs like a champ .

### 5/5 — Great app

*2020-12-22*

My bike runs very well with the setup given by this app. Oil mix ratio adjustment is fine too

### 5/5 — Engine runs clean and fast

*2020-12-18*

My YZ125 was too rich with stock jetting. After set up the carb with this app, the mileage has increased and the engine runs like a dream

### 3/5 — Jetting info incorrect

*2020-01-27*

Hi, like the idea of this app and want to use it, but the specs on the app are incorrect for the 2019 (2020 is the same as 2019) YZ85.  In 2019 Yamaha redesigned the YZ85. Can you please update the app or refund my money?  

Here are the correct stock specs, please verify though. 

YAMAHA YZ85 JETTING FOR THE KEIHIN PWK 28mm
Here are MXA’s recommended jetting specs (when changed, stock specs are in parentheses):
Main: 145
Slow jet: 45
Needle: NBKF
Clip: 4th from top
Air screw: 1-1/2 turns

### 5/5 — Nicht schlecht

*2019-09-15*

Muss noch auf Herz und Nieren geprüft werden

### 5/5 — Dialed In

*2019-07-23, version 1.5*

Great app to dial in mine and my kids bikes as they are different sizes. Also riding year round and at different altitudes makes rejetting a breeze. Bikes run great and are responsive like they should be and I expect.

## Frequently asked questions about Jetting for Yamaha YZ 2T bikes

### What Yamaha YZ models does Jetting support?

Jetting supports a wide range of Yamaha YZ models including PW50, PW80, YZ65, YZ80/85, YZ125/125X, and YZ250/250X, with model years generally from 1995 to 2024.

### How does Jetting use weather data?

Jetting can automatically retrieve temperature, altitude, pressure, and humidity using your device's GPS and an internet connection. Alternatively, you can manually input this data for offline use.

### What specific jetting components does Jetting recommend?

The app provides recommendations for the main jet, needle type and clip position, pilot jet, and air screw position to optimize your carburetor's performance.

### Can I fine-tune the jetting recommendations in Jetting?

Yes, the 'Results' tab allows for fine-tuning adjustments to adapt the recommended jetting configuration to your specific engine's needs.

### Does Jetting support different measurement units?

Yes, Jetting supports various measurement units for altitude (meters, feet), temperature (ºC, ºF), and pressure (mb, hPa, inHg, mmHg) to accommodate user preferences.

### Is Jetting available on multiple platforms?

Based on the provided data, Jetting is available for iPhone, iPad, and iPod, indicating iOS compatibility.

### How often is Jetting updated?

The application was last updated on October 20, 2023, with the latest version being 2.3, suggesting regular maintenance and updates.

### What is the price of Jetting for Yamaha YZ 2T bikes?

Jetting for Yamaha YZ 2T bikes is a paid application priced at $2.99.

## Version history (last 5 releases)

### 2.5 — 2026-08-19

Logbook, and the weather station now inside Conditions.

- New Logbook tab: it saves each ride with the bike, the weather and what the app recommended, so you can note afterwards what you actually fitted and how it went. Rating goes per circuit: low, mid and high.
- Export the logbook to CSV, or share a copy to move it to another phone. Importing never deletes anything: what is missing gets added and what is there gets updated.
- The GPS tab is gone: the nearest weather station is now queried from Conditions, which is where the readings end up anyway.
- New launch screen, result boxes that use the full width of the screen, and values that no longer get clipped.
- Help rewritten from scratch, one text per screen, in all seven languages.

And from version 2.4, in case you skipped it:

- Bikes updated through 2027, with the YZ85LW as a new model.
- Jetting reviewed against the official Yamaha service manuals.
- More accurate response to altitude.

This version requires iOS 15 or later.

### 2.4 — 2026-08-04

Models updated through 2027.

- New model: YZ85LW.
- YZ125, YZ125X, YZ250, YZ250X, YZ85, YZ65 and PW50 now cover the 2025, 2026 and 2027 seasons. The 2026 YZ125 includes its new carburetor calibration.
- Jetting reviewed against the official Yamaha service manuals: needle type, clip position and air screw corrected on several 2021-2024 models.
- More accurate response to altitude: the main jet curve has been refitted against reference correction data.

This version requires iOS 15 or later.

### 2.3 — 2023-10-20

Minor adjustment to the calculation model of some engines after testing on the dynamometer. Engines are updated up to 2024.

### 2.2 — 2023-08-17

Models are updated up to the year 2024, and some errors are corrected, such as in the form to input altitude.

### 2.1 — 2020-10-16

Added 2021 models.
Added PW50 and PW80 from 1995 to 2021

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All apps by ISEnet: https://appshunter.io/developer/811255764

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*