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Discussion Starter #1 (Edited by Moderator)
hi all , just bought a trx450 it had dropped a valve and damaged the piston and head also the cylinder, I bought a new big bore kit and new head, however the bloke that is building the engine said that the piston when at top dead centre its sitting down more in the cyclinder an the chain side and sitting up higher on the other side, he thinks the crank is bent, however a mate of mine said thats what these engines are like with big bore kits, they are never fully top dead centre on one side, does this sound right, as the engine builder isn't wanting to go any further until he has a crank thanks.

see pics below


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