MY17-20 | ECU Tuning | Honda CRF 250 L and Rally

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  • Regular price $299.98
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The 91 Octane Series of ECU reflashes change the spark timing to extract more power from 91 Octane (R+M)/2 fuel.

 CORE ECU Option:

Please send me a new ECU = You will receive a new ECU that is already tuned from us, no need to mail in your OE ECU. 

I will send in my own ECU = You need to mail us your OE ECU so we can reflash it.

If you purchased a new ECU from us, you can return your stock unit for a core deposit. The Core Deposit is $129.99 USD. To initiate a return, contact us at Email Support.  

Features of this reflash:

  • More aggressive timing utilizing 91 octane fuel
  • 11,000 RPM rev limiter
  • Base fuel mapping enriched
  • Closed loop fueling zones reduced which allows a better compromise between fuel economy and power
  • Acceleration fuel maps enriched
  • Warm idle raised up to 1500RPM
  • PAIR and EVAP check engine codes removed

Required Modifications for STOCK IMPROVED:

  • None - OE Bike Expected

Required Modifications for STAGE 1:

  • Free Flowing Muffler and Head Pipe (FMF, Yoshimura, or similar)

Required Modifications for Big Bore Kit:

  • Larger engine displacement > 249 CC [Please let us know the new displacement]
  • Free Flowing Muffler and Head Pipe (FMF, Yoshimura, or similar) for best results

Optional Mods: 

  • Airbox Modifications / backfire screen removal


If you are mailing us your ECU, please use the address below:

550Performance LLC
ATTN: ECU Reflash + Order Number
1921 Huckleberry Ave
Omro, Wisconsin 54963

Upon receipt, we will flash the ECU and send it back to you. Typical turnaround is 1 - 3 business days. In some rare cases this could be as long as 5 business days.

Please be aware that 550Performanc LLC is not responsible for and will not refund any charges incurred upon arrival of our products abroad.
This includes charges such as, but not limited to:

  • Import duties
  • Import VAT
  • Custom fees
  • Warehousing fees
  • Any Parcelforce UK fees
  • Any charges incurred as a result of importing goods ordered from 550Performance LLC

Prices and cost of shipping published on our website does not include any of those charges. When placing an order with 550Performance LLC you agree to take full responsibility for any charges incurred by importing our goods into your country.


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