Removing engine to frame bracket

[Athame57]

I wanted to adjust the cam chain tensioner today but found that I could not remove the brackets that are on either side of the tensioner bolts. The two forward ones weren't a problem but the large one at the engine end is inaccessible with any spanner I have due to room between bolt and engine, does this job need a special tool or something?

[Bryanj]

Normal 6 sided 3/8 drive socket should fit ok but why remove plate to adjust chain

[Athame57]

I can't see how to access the bolt without moving the plates.

[Nurse Julie]

Have you got crash bars fitted?

[Athame57]

No...

[Bryanj]

Never removed plates in normal service operations, just used sockets and spanners

[mike the bike]

You're not trying to remove the blanking plug instead are you? 

[Athame57]

You're not trying to remove the blanking plug instead are you?

Just put 'cb400f cam blanking plug' into google images. I see the adjuster bolt  goes into a plug that goes into engine. hhmmm...mine has a hole for an allen key in it...looks like I've got another bodge to get rid of. some previous owner left me with a home made brake arm and non standard clutch cable with wrong fittings to sort out as well. .... I think I want the plates off so I can have a good look....

[Bryanj]

OK its not an adjuster bolt its a locking bolt to stop the internal adjust bar moving.
The original bolt had a 6mm thread that screwed direct into the alloy crankcase with an 8mm thread just under the head for the locking nut. I have linked to a stainless repair kit on the forum already somewhere.