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CRF300L Big Bore

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CRF300L flashed ECU for engine mapping big bore tune

CRF300L Big Bore

4.5 (123)

ECU Tune For 301cc Big Bore

Name: CRF300L Big Bore ECU Tune For 301cc Big Bore - ECU Tune For 301cc Big Bore
Brand: CRF300L Big Bore
SKU: 44848066429103
Price: 299.0 USD
Availability: InStock
Rating: 5 (3 reviews)

4.5 (1,234)

Sold 100+ last 30 days

20% off first order

$299.00

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Color

Black

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We've partnered with the wizard at 550 Performance to offer a custom tune to match our 301cc big-bore kit with or without ported cylinder head.
This flashed ECU is required when running the the big-bore kit. Stage 3.0 is intended for the bi...

Reviews

5.0

3 ratings

550 Performance stage 3 ECU

Fueling seems to be spot on. Very smooth!

Shannon · September 27, 2025

3.0

Feeling same spot on. Pulls much better all through the power band. Modded dual snorkel air filter inlet, twin air filter, 550 no cut intake tube, cams, big bore, Chinesium FMF exhaust with spark arrestor. Much more fun now.

Tim · March 13, 2025