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We've got a lot of time on the TBI 125's. Big believer in the TSP stuff here. We use the TSP ERM Mapping & 12degree Piston & Insert on our 25 125SX and will for '26. The kiddo was able to rip a couple holeshots at the LL regional and qualify for Loretta's in 125C. Granted it's only the C class, but there's a lot of talented rippers at the regional / national level on the gate. The bike proved fast enough to rip great starts against a gate full of petcocks & carbs. He also ripped a bunch of...

I think the tuners in America just gave up. Look at EMX125 in Europe. The fastest 125 class there is and they are running the EFI models.

I think a lot of people parrot what they read in MXA. So little difference, but the 150 does get down the road quicker.

I own both 125 and 150 2018s The 150 rips for sure, I think people say it's narrow because it's got more torque and gets it's business done. The whole 150s don't rev is an old wives tail imo. The poster above said it best, just pick the one you find in best condition and value

Well damn, go to 60:1 if it’s STILL to smoky for your opinion, go get the ecu flashed and mapped, and then if it’s still too smoky, put some exhaust packing in. -spy

Can’t do any jetting on this mate it’s fuel injected