nickbrick10

Hi, Friend bought a new Montesa 4rt but third time out he drowned it in a river, we got the water out of the air box, exhuast and barrel and thought it would be best to get the bike going and warmed up to get rid of any water left in it (dont know if this was the right thing to do). Surprised how quick we got it going but noticed a light knocking sound, also seemed to lack top end power. My friend is skint after buying the bike so are trying to find out what the problem might be and how much it will cost. Has anyone got any ideas, one guy told us it may have bent the valves through water compression but I thought it wouldnt run at all if that had happened. Any ideas much appreciated and thank you for your time. Nick