Hi guys

Am in need off some technical advice a bought a couple off wr 400 / 426 in bits ... Ie engines one of the engines had a cracked case and the other had a damaged con rod . After splitting the two engines and make one a av put it back in the bike to find it starts and find but in my eyes it's not running smooth for my like in , after reading some off the posts on here about swapping bits from an earlier engine to a later one ie one off the cranks had a key way and the other didn't could the timing be all wrong .Is there any on line manuals a could check the part numbers against

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