Just a note one of the most powerful 583 engines seen was a lump bought off ebay with no history at all, it was checked and put in the bike. The dyno centre said it was the most worn loosest engine they had seen with the most piston slap ever when cold
, it went on to produce the most power they have ever seen from a 583 and more than one or two 620's, it wouldn't last half a season they said.....2 years later it was still going
So don't waste time/money with new components buy an old shitter and enjoy the power
