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It's nothing new, just an old engine with a different head and cylinder has 1 mount differently, when I changed the cylinder I thought whether to buy this head is for 300$, but it turned out that the difference is very small in power, so just change the map and it is the same in addition this solution has a disadvantage, because the chain, when it stretches slightly changes the timing phase and requires modification of the top bracket the engine is called NT. 250 and the pictures are from ali express store and this chinese guy must have eaten rice from plastic, because he has such prices thathands are falling down, and for this engine he wants almost as much as for whole motorcycle.
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