icando3d2

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guys i have this engine in a showtime 90 its a non pumped engine i had a 1.20 pumped on it i swapped it out for a new one it sags when inverted it sputters and has loads less power than the pumped i had a 18x6 on it before now im down to a 15x6 i cant get it to give up the power i know it should have my saito 100 would walk all over it im running the same fuel 10% guys help me if i need more nitro tell me how much to run thanks in advance