Chain adjustment issue

[Benno]

My chain is a bit slack (3 inches of movement!) so I need to tighten it a bit.

But there is some kind of pin over the right side nut that I can't get off (it's a castle nut, I think the correct term is - can this be undone by a normal spanner?). How do I get this thing off without breaking it?

Cleaning the bike would probably help a little bit. It's covered in much and grime
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[P.]

You unbend the pin and pull it out.

[Islander]

Unless its an R shaped sprung one in which case you just pull it out

Don't forget to put it back when you're done.

[P.]

[Islander]

[map]

[Islander]

[haroman666]

[Benno]

Hmm, OK. Seems like I'll have to bend/snap it to get it off though. Let's see what happens!
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[P.]

[Benno]

Well this pin is proving very hard to take out! And there seems to be a very thick bolt/screw going through the nut. Here's a picture of what I'm working with (I know it's filthy )

I am a total mechanical noob so forgive me

https://cdn.bikechatforums.com/files/imag0510.jpg
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[Matt B]

Bend the lugs on the left together then stick some thin nosed pliers in the loop end and lever/wiggle/twist it out. Maybe some WD40 and a soak for a while.

If you are going to replace it stick an R Clip in there instead. Makes it easier next time you want to adjust.

Get them on ebay cheap as chips.
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[Benno]

[Matt B]

I'm a bit lost regarding the big fat screw thing...? Should just be the split pin passing through the hole in the axle and stopping the castellated nut from turning.

Get the pin out then see.
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[haroman666]

Bend the ends of the split pin and pull it out.
Then undo the nut as a normal nut on a thread.
There is a hole in the bolt that that split pin goes through.
Much like this arrangement here:
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQL4m2agXziY0o4H2IpEaYjzK5WmhjNgxyFh-TkAO6HHndim-Ni
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The mistresses: 2000 Honda CBR600f, 2000 Honda VTR1000

[Benno]

This is so typical, I am missing the exact spanner size I need to take it off yet the nut on the other side is a different size that I have the spanner for

Time to do some MORE tool shopping. Although before I do, I watched a video on chain adjustment and the guy only undid the axle nut on the left hand side of the bike before tightening the chain. Thinking about it, is this all I need to do since if I loosen one nut on one side surely the whole thing is loose?
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[Matt B]

Yes - as long as you can get it loose enough without the axle starting to spin. Same when you re-tighten.

Have you not got an adjustable spanner that will fit the other end?
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stinkwheel: He had an animated .gif of a cat performing fellatio. It's not socially acceptable. It can have real life adverse effects on other people.

[Islander]

Never begrudge buying tools - they'll serve you well in the future if you look after them.

[Benno]

Well I feel stupid. I found all the tools I need in the bike's own toolkit under the seat including a tool to undo the right-side axle nut

Both axle nuts are so f*cking tight though! Can't get them undone. Going to have another go later, soaked them with some WD40 for now.
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[Islander]

Rear spindle nuts are done up pretty tight. Try putting a piece of piping or similar over the end of the spanner that goes on the castellated nut to give you some additional leverage. Bike tool kits often come with something designed to slip over the end of the spanner for exactly this purpose.

[map]

[Benno]