What size is oil drain bolt?

[Philly_Chris]

I need to start beefing up my metric wrench collection (I have a Nova so all my tools are standard).
The Clymer says use a "spark plug socket", do they just mean "A" spark plug socket, or are the plugs the same size on my bike- its an'82 gs850G

Thanks

[Anonymous]

It's a 13/16" bolt. The plugs and bolt are the same size on my '78 GS750, so the same socket can be used for both.

[Anonymous]

Whatever it is (duhhhhhh to me) its the larger of the two "standard size" spark plug sockets that come with most socket sets.

[Anonymous]

Is there any other standard hardware on these bikes?

[chuckycheese]

Yes

I'm pretty sure mine's 18MM