Surron Ultra Bee Troubleshooting Guide: Problems, Causes & Replacement Parts

Common Problems × Cause Explanation × Action Suggestions

When using the Surron electric dirt bike, if an abnormal situation occurs, refer to this Ultra Bee troubleshooting guide to make an initial assessment of the problem source and take appropriate action.
This article is organized by fault category. It not only describes the phenomenon but also analyzes the underlying causes and gives handling suggestions, making it easier for users to locate and respond to issues quickly.

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I. Dashboard and Starting-Related Faults

1. Dashboard and headlight are on, but the bike cannot move

This type of issue is usually caused by the vehicle triggering its protection mechanism. Recommended steps:

• Switch the dashboard to TRIP mode and read the fault code.
• Check the following three common protection states:
  • Brake power cut protection: Caused by accidental brake lever activation, cutting power.
  • Throttle runaway protection: Detected abnormal throttle input, power is automatically cut.
  • Kickstand cut-off protection: Kickstand not retracted, system prohibits starting.

If none of the above applies and there is still no response, it is recommended to contact an authorized dealer for inspection and service.

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2. After turning on the key, neither the dashboard nor the headlight responds

Focus on checking the following basic problems:

• Whether the battery is fully discharged.
• Whether the key is turned to the correct position.
• Whether the power connector is loose.

If all of the above are normal, contact the dealer to further check the wiring or controller system.

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3. Suggestions for handling faults when they occur

• It is recommended to keep a fault code list and its meaning saved in your phone for quick reference after reading a fault code.
• Some minor faults can recover on their own in a short time, such as power cut caused by the kickstand not being retracted.
• If the fault continues to exist, contact after-sales support promptly to avoid further damage to the controller system.

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II. Brake System-Related Faults

4. Strange noise when braking

Possible causes include:

• Brake shoes or discs are excessively worn.
• Caliper not centered, causing an abnormal contact angle between the pad and disc.
• A foreign object is stuck in the brake pad.
• The brake disc is deformed or contaminated with oil, affecting the friction.

It is recommended to check the above components and replace or clean if necessary. If you cannot determine the cause yourself, go to a dealer for service.

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5. Braking power decreases

Similar to the noise issue, common causes include:

• Severe wear of brake pads or discs.
• Oil film on the disc surface reduces friction.
• The caliper position is abnormal, or the pad is not fully contacting the disc.

It is recommended to replace worn parts promptly and ensure the braking system is clean and dry.

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6. Quick hard pull gives braking, but slow pull feels no stable pressure

This may be due to insufficient oil in the brake master cylinder or internal piston leakage, causing unstable oil pressure.
Such hydraulic system problems are not recommended for users to disassemble themselves — contact the dealer immediately for inspection.

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7. No braking power even when the lever is fully pulled

Immediately stop using the bike and check:

• Whether the brake lever is bent or loose.
• Whether the brake pads and disc are severely worn.
• Whether brake fluid is leaking.
• Whether the fluid level in the inspection window is significantly low.

If it cannot be judged visually, go to a service station as soon as possible to check the brake system’s sealing condition.

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III. Tire and Drivetrain-Related Problems

8. Tire grip noticeably reduced

Common causes:

• Tire wear or rubber aging (rubber hardens, reducing friction).
• Tire pressure is too high, causing the surface to harden, reducing the contact patch, easier to slip.
• Wet road surface or large temperature changes can also affect grip.

Recommendation: Even if tires appear unworn, replace them once a year for safety.
When inflating, follow the recommended pressure range on the tire sidewall — do not assume “the more inflated, the better.”

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9. Vibration or abnormal noise from wheels while riding

Check:

• Whether spokes are loose or broken.
• Whether the axle is properly tightened.
• Whether the bearing is worn, causing an imbalance.
• Whether there are foreign objects or damage on the tire surface.

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10. The motor rotates, but the bike does not move forward

Usually caused by belt breakage or tooth damage, resulting in power not being transmitted to the wheel.
Check the belt condition; if there are broken teeth or cracks, replace promptly.

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11. Chain abnormal noise

• The chain should be kept well-lubricated to avoid dryness.
• Check for deformed, broken, or stuck links.
• Use a chain cleaner and lubricant for regular maintenance.

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12. Wheel spokes loose or broken

Unbalanced spokes will affect the rim structure and may cause a tire blowout or wheel wobble.
Damaged spokes should be replaced by a professional technician, and wheel tension readjusted and corrected.

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IV. Suspension System Faults

13. Front suspension too stiff, bumpy ride

Possible causes:

• Front forks are not kept parallel, increasing resistance.
• Spring preload is too tight.
• The compression damping adjustment is too high.

It is recommended to adjust preload and damping according to the manual and perform regular suspension maintenance.

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14. Rear suspension too stiff

Check:

• Whether the rear linkage rotates smoothly.
• Whether the preload is set too high (should be adjusted just enough so the spring is not loose).
• Whether compression damping is too high.

Proper adjustment will improve riding comfort.

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15. Friction noise during suspension travel

First, check whether there are foreign objects scraping the outer surface of the suspension.
If the noise comes from internal components, it may indicate oil seal aging or slider issues — should be handled by the dealer.

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16. Oil stains appear on the surface of the shock absorber

If it is only a thin oil film, this is normal lubrication.
If there are obvious oil stains and dripping, suspect seal failure and have it inspected as soon as possible.

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V. Electrical System and Throttle-Related Problems

17. Battery shakes during riding

Check whether the battery compartment has:

• Loose or damaged cover.
• Missing or displaced rubber pads.
• After locking the cover, there is insufficient preload on the battery.

It is recommended to always keep the battery securely fastened to prevent power loss or poor contact while riding.

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18. The throttle returns slowly or sticks

Check:

• Whether the throttle is installed too far inward, causing friction with the handlebars.
• Whether there is debris between the throttle and the grip.

Re-adjust installation position or clean if necessary.

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19. GPS shows “No Connection”

This may be related to the positioning module or controller software. Contact after-sales for inspection or software update.

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VI. Post-Crash and Structural Faults

20. How to self-check bike condition after a crash

Turn off the key → Lift up the bike.

Check:

• Whether the front forks are parallel or have a lateral offset.
• Whether the handlebar is deformed or misaligned.
• Whether brake levers are loose or detached.
• Whether the braking system functions normally.
• Whether the brake disc and sprocket are deformed.
• Whether the footpegs are broken or bent.
• Whether the throttle can rotate and return normally.

Finally, turn the key back on and check whether the dashboard and ride function are restored.

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21. What to do if the steering head bearing is loose

Operation suggestions (if inexperienced, have a professional technician perform this):

• Loosen all upper triple clamp bolts and remove the upper clamp.
• Tighten the steering stem nut until there is no gap but no obvious resistance.
• After reinstalling the upper clamp, tighten to the following torque values:
  • Stem nut: 40 N·m
  • Pinch bolts: 13 N·m

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Conclusion: Three Key Points for Fault Diagnosis

• Being able to read and understand fault codes is the first step in quickly identifying problems.
• Being able to recognize unusual sounds and operational feedback from the bike is key to daily inspections.
• When unable to determine the cause, handing it over to professionals promptly is the best protection for both your bike and your own safety.

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