Hey guys I am helping a younger rider that has been riding for 3 years now. He is on a 2012 125 SX and is into his 2nd season of racing this year. His skills are improving quickly! I have been trying to coach him what I have learned through the years and what other pro riders have taught me. He is a small rider (140 lbs max) so the 125 does get him around the track quite well. He is pretty fearless when committing to jumping. I am teaching him that corner speed is where races are won. He is racing 250C and schoolboy class in our local mx series. Most of the class is stacked with 250f's. Today's tracks also cater a lot to 4 stroke bikes with jumps right out of corners. We have already been working on suspension set up and have been working with factory connection on valving. It's close to being about as good as we can get it on his budget. Our next move is to increase the power of the 125. We are looking for more power everywhere in the rpm range. Getting out of corners faster is what we are trying to focus on to stay up with 250f's. With the amount of research I have done, I have concluded that 2 inexpensive mods that have good results are cutting the head for the correct squish band clearance, and boring the carb. I plan to contact Cycle playground and question if it will have a noticeable gain of power. We don't have the budget to build a full race motor on race gas because this bike gets atleast 5-10 practice hrs a week put on it. If any of you have suggestions or have any experience with these mods please chime in! I am open ears on suggestions. Thanks!