Quote:
Originally Posted by pyoungbl
ZS, when I weighed the BB piston it was 30% heavier than OEM.
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Wow, that's a lot. That would definitely require bringing the red line down quite a bit, and even then, you are still putting more stress on the connecting rod than the OEM piston assembly does; assuming that the new piston was machined correctly, which does not appear to be a given, in light of recent experience.
This is starting to become a question of whether the juice is worth the squeeze. Considering yours and ChopperCharles' experience with the BB kits, plus others that I suspect simply don't post up their results, I'm beginning to suspect that the answer is a firm no, at least in regards to the NC250 engine.
Now tuning the ECU with a stock setup is another matter, given that GPX manages to get 32 HP out of their FSE250 dirt bike with the NC250 in it; there's definitely more power to be had from the OEM 249cc set up. We just need to go about getting it differently, needing EFI tuning versus increased displacement.