Ignitions and Electrical› Ignition Boxes and Components
Big Gun
Big Gun 01-12 Yamaha TTR 125/LEX/EX/LX Rev Box
SKU: B0AC 40-R29
Moderate — 2–4 hours
Description
Part #: 40-R29
If you are looking to swap out your stock CDI box, the Big Gun Over Rev Box is an affordable alternative to highly-priced OEM replacement boxes. It increases the overall RPM limit over the stock box and advances the timing curve.
MIA's Description
Installation is straightforward as it's a direct plug-in replacement for the stock CDI box. The product comes with a 6-month limited warranty.
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | Big Gun |
| Part Number | B0AC 40-R29 |
Videos
Big Gun Exhaust Tech Talk - Power Box 101
Yamaha TTR 125 Bike Build
NEW PIT BIKE RIPPIN! YAMAHA TTR110 WITH PRO CIRCUIT EXHAUST! #shorts #pitbikelife #yamaha #hillclimb
5 reasons why you need...
2023 Raptor 90 Big Gun Evo Exhaust
Klx 110 stock mod BBR D3 pipe revving #bbr #pitbike #takegawa #klx143
2007 crf 450r big gun evo r exhaust
BBR Motorsports CRF50 Walk Around
2023 XR650L SuperMotto
Surprise Kawasaki KLX 110😁 #shorts #surprise #kawasaki
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return Policy