Quote:
Originally Posted by Working_ZS
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.
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The nc250 engine on Aliexpress are sold in 300cc version with the same head and shaft, and you can't get much out of mapping the injection, also heavier piston means different crank, and thus more Newton meters and better start.The fact that someone does not fit the cylinder is rather a matter of what Chinese factory it was produced in and you also need to be a little lucky and save the bike, because in this frame this engine is strained because of the weight.