rawrrrr
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hahaha i payed £££ was sweet till i got home pinned the valve and went blasting about now rings gone but tbh i don't thing compression is a thing to be bothered about its a 2 stroke so it needs a top end at some point at least you will know the condition of the engine before you start tarting it up if you know what i mean correct me if I'm wrong here guys but i think the money is really on that bottom end and how many monkeys with spanners have been at it
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@Calum it was a new crank shaft and some other stuff Athena parts were used i believe? I know it said Athena on there somewhere but yes I know what you mean I haven't ridden it yet still waiting for the piston and bore but the gears are smooth and the crank is smooth and has normal play
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@declan Yeah if you have checked all the tolerances then that's good. No up or down movement a fraction of side to side movement.
Just make sure you gently skim the barrel and head and use either genuine or athena head gaskets on reassembly then it should be problem free. Also make sure the piston ring end gap is spot on. Any modifications to the rings then ensure you chamfer the butts.
Obviously ensure the piston is faced the correct way.The other thing on these engines is the powervalve. If you are boring out the cylinder, then ensure the powervalve has been modified appropriately so that it doesn't foul the piston.