Yamaha Blaster OEM VM26 Jetting Calculator
Get a starting jetting setup for your Yamaha Blaster’s original OEM Mikuni VM26 carburetor. Select your exhaust, airbox, air filter, reeds, engine setup, temperature, and elevation. The calculator will show a suggested main jet, pilot jet, needle clip position, and air screw setting.
Carburetor identification matters: This tool is for the original Yamaha Blaster OEM VM26. Do not use its recommendations for a Mikuni VM26-606 replacement carburetor or a Keihin PWK.
Only use quality jets and jetting kits like the ones from Ken OConnor Racing. Inexpensive jets from the box stores don’t have consistent flow rates and will have you frustrated and chasing your tail.
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KOR Yamaha Blaster OEM VM26 Jetting Calculator
Setup Information
Recommended Starting Settings
Modification correction: 0
Temperature correction: 0
Elevation correction: 0
Air leaks, incorrect float level, restricted fuel flow, worn carburetor components, poor fuel quality or mechanical problems can make any jetting recommendation inaccurate. A lean two-stroke engine can quickly damage the piston and cylinder.
How to use your Yamaha Blaster jetting recommendation
The displayed settings are a starting point, not a finished tune. Install the recommended jets, confirm that the carburetor is clean and the engine has no air leaks, and test the Blaster under the conditions in which you ride. Start rich and make changes in small steps while checking throttle response and engine behavior.
The main jet has its greatest influence at large throttle openings. The pilot jet and air screw affect idle and the first part of throttle opening. The needle position influences much of the midrange. If a problem occurs only in one throttle range, identify that range before changing jets.
Temperature, elevation, exhaust, and intake changes can all affect the fuel mixture. Recheck jetting when you change your setup or ride in substantially different conditions. A lean mixture or an air leak can damage a two-stroke piston and cylinder.
Yamaha Blaster OEM VM26 baseline settings
For the stock setup displayed when the calculator first loads, the starting settings are a 230 main jet, 32.5 pilot jet, needle in the middle clip, and air screw 1.5 turns out. Your selections may change the recommendation, so use the calculator result for your particular setup. Ken OConnor Racing
Before changing jets
Check for intake air leaks, a clean air filter, proper float level, unrestricted fuel flow, and sound carburetor components. Jet changes cannot reliably correct a mechanical or fuel-delivery problem. If you are unsure which carburetor is installed, identify it before using this calculator.
Need parts to dial in your setup? Browse our Yamaha Blaster jet kits, main jets, and pilot jets using the product buttons above the calculator.
Frequently asked questions
What is the stock Yamaha Blaster main jet?
The stock baseline shown in this calculator is a 230 main jet for the original OEM VM26 carburetor. Check your actual carburetor and setup before ordering jets.
Can I use this calculator with a VM26-606 replacement carburetor?
No. The VM26-606 is a different replacement carburetor. This calculator is specifically for the original Yamaha Blaster OEM VM26.
Does a pipe change mean I need a different main jet?
It can. Select your exhaust in the calculator and treat its result as a rich starting point to verify on your own machine.
Will the calculator give me a final tune?
No. It estimates starting settings. Actual jetting depends on the condition of the engine and carburetor, fuel delivery, weather, and riding conditions.
Should I change the pilot jet to fix a full-throttle problem?
Diagnose the throttle range first. The pilot circuit primarily affects idle and small throttle openings; the main jet has the greatest influence at large throttle openings.