I dont know if its a gear or the flywheel. Had a feel around the hole and it doesn't have a thread on it so i dont think a bolt was used to close it off.
i have the same hole in the gearbox, so it must be normal
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i would have though a bung would go in there to stop any dirt, etc getting in?
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Oh good, thanks for the replies guys. Ill hae a look around if theres a bung that should be there.