How to adjust the impact speed of the OKMO B02 engine?

Help and Guides
1

Been seeing a lot of people asking how to get the B02 running smoothly, so here’s how I usually tune mine.

Nothing complicated — just step-by-step based on real use.

:green_circle: 1. Check your ignition first

Before touching anything else, make sure your ignition is actually working properly.

Quick checklist:

  • Timing is set correctly

  • Spark plug is firing where it should

  • Ignition system is working normally

If all that looks good, you’re ready to start.

:fire: 2. First startup (baseline)

Here’s how I usually get it going before tuning:

  • Open the carb about 1 full turn
    → This just gives you a safe starting point since you don’t know the mixture yet

  • Pull the governor linkage by hand
    → Helps get things moving

  • Spin the flywheel with a drill
    → Gets fuel into the cylinder

  • Turn the power on

  • Pull the governor again to start it

:backhand_index_pointing_right: At this point, the engine should fire up.

:warning: 3. What you might notice

Don’t expect it to run perfectly right away. You might see:

  • Knocking sounds

  • Unstable RPM

  • Random stalling

Totally normal.

You can even mess with the governor and carb a bit on purpose — just to see how it reacts.

Once it stalls, that’s actually a good time to start tuning.

:wrench: 4. Carb tuning (this is the key part)

Here’s a simple way to dial it in:

  1. Close the carb completely

-> There’s still some fuel left in the cylinder, so it may fire briefly

  1. Restart the engine

-> It’ll burn off the remaining fuel and rev up

Now while it’s running:

:backhand_index_pointing_right: Slowly open the carb back up

  • Go little by little

  • Listen to the engine

You’re trying to find:

:fire: the highest, smoothest RPM

:backhand_index_pointing_right: When the mixture is right, you’ll hear it:

  • smoother

  • more stable

  • cleaner sound

:gear: 5. Governor adjustment

Once the carb is dialed in, move on to the governor.

Steps:

  • Loosen the governor nut

  • Turn the adjuster counterclockwise one step at a time

  • Use the thread marks as a reference

Keep going until you hit the speed you want.

Then:

:backhand_index_pointing_right: Lock it back down by tightening the nut

:test_tube: 6. Final check (“final exam” :grinning_face_with_smiling_eyes:)

Once everything is set:

  • Pull the governor linkage by hand

  • Watch how the engine responds

You’re looking for:

  • smooth idle

  • smooth transition to high RPM

  • no stalling

:backhand_index_pointing_right: If it runs clean across the whole range, you’re good.

:fire: Final thoughts

At the end of the day, tuning is all about getting:

  • the right air-fuel mix

  • stable RPM

  • smooth response

There’s no exact “perfect setting” you can copy —
every setup is a little different.

:backhand_index_pointing_right: The trick is:

:fire: small adjustments + listen + repeat

Once it’s dialed in, the engine should run smooth and reliable.

Enjoy it :+1: