MikeM said:Sump drain size. Does anyone know what size socket the sump drain is? I have been using and adjustable wrench. Caveman I know but it works.
I would like to get a real socket for it. I know its big. Larger than 1 inch. My bike is a 71
Deets55 said:Mike,
I have 75 MK3. Plug is 1.5" SAE. Which happens to be the same size as the front drive sprocket nut. I purchased a 1.5" deep socket, cut it in the center and welded in a piece of pipe ( standard socket was not deep enough).
MikeM said:Sump drain size. Does anyone know what size socket the sump drain is? I have been using and adjustable wrench. Caveman I know but it works.
I would like to get a real socket for it. I know its big. Larger than 1 inch. My bike is a 71
Thanks MikeM
dynodave said:The 1-1/2" started with the 850's . If yours is 1-1/2 then it (engine or drain/filter) was replaced at some time.
Not a fair comparo, example #2 clearly showing pipe wrench marks :shock:Bob Z. said:Just happened to have some cases in the basement.
Trying to show the difference. Left 850, nice 1-1/2" hex condition, center 750 rather chewed up!, probably 1-1/2", right from an 88 engine has the slightly smaller BSW hex size.
The Commando plugs are steel, the 88 is brass. The threads into the crankcase are the same. All have the brass mesh and retaining clip.
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baldy said:I use a trailer hitch wrench (1.5 inch) from Walmart ($10) on my 1970. Works great.
aceaceca said:I have a 71 Commando and use a 1 7/16" six sided socket.
auldblue said:![]()
1.5 AF or 1 1/2 AF but some I have taken out have had the cold chisel and hammer job. Effective but agricultural!
Rohan said:dynodave said:The 1-1/2" started with the 850's . If yours is 1-1/2 then it (engine or drain/filter) was replaced at some time.
It started earlier than that.
I have a set of dommie cases with that large sump plug.
Its 500cc and 1950s, on a generator engine.
Swaps with 850 parts not possible.... (as in swapping cases).