Can you still rebuild/repair HK43B or C3a S39B carbs,,what would you charge ? I have 2 with new kits in them but they are both giving same results,saw does not have much power, I could not ultrasound clean them, just carefully sprayed the passages, ? I know this is an old post but looking for help other than buying chinese knock offs. I did put a carb on from a different saw and it had alot of power.