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Hi there.
i have a problem :-(
i have chip & filter (piper) .
when i put the piper
i have noice (knocking)
from 5.5k rpm
what could the problem ?
please help me
Do you mean knocking as in rattling exhaust noises, or knocking as in cylinder detonation?
If its detonation, and it didnt do it before you put on the filter, then the obvious answer is that the air/fuel ratio is too lean and it needs richening up. You should try and get the chip reprogrammed to deal with this.