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Not sure what this is do I remove it?

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McCabe-Thiele (Ted):
Whilst cleaning my lower crankcase yesterday I noticed this bolt/cap/plug not sure what it is as I see no reference to it in my manual.

The photo is upside down it is underneath where the points cover sits. Should I remove it ?


.what is this cap-bolt by Macabe Thiele, on Flickr

philward:
Not a 400 expert but on 500/750, its the oil gallery plug - oil travels along this to mains/big ends/etc. I always remove to clean oil ways properly - you can blow through to each main bearing oil feed for example

Bryanj:
On the other end is a little push in plug held in by the alternator cover and if you leave the cover of whilst starting the engine it will dissapear into a dim and distant corner plus large black puddle under bike

Trigger:
Heat it up with a blow torch until you can smell the rubber getting hot and as has already been said, use a good socket or clamp it in a vice and turn the case to get it moving  ;)

Once off, you can use a long bar to push the plug out the opposite end. A good clean out and replace the O' rings.

McCabe-Thiele (Ted):

--- Quote from: Oddjob on March 30, 2021, 04:15:52 AM ---Make sure you use a decent spanner/socket when removing it as they tend to round off easily.

--- End quote ---
Although the nut looks unmarked a 14mm socket seems  a poor fit as the head looks almost as though its an angled top, 9/16 AF no better. I used my impact driver - straight off no issues. The other end is solid so I will put a bar through & tap it out.

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