he was in the same situation as gav is rite now where he has taken off as much as he could off the piston in order for them to still be strong enough to use, so the only other way to lower it more without taking the engine apart was for a decompression plate to be used which was suggested by ahmed!!! both gav and this other guy were in the same boat hence why i've suggested to gav ahmed shouldn't have a problem as he also uses him.

Hardeep.