Chain adjustment

[veeeffarr]

Hi guys,

Got new chain and sprockets today,

Removed the exhaust of my 2001 CG125 to get to the axle nut, found out i don't have the right socket, so going to try and get it to a mech tomorrow.

Only problem is I can lift the chain quite a few inches off of the rear sprocket - So the gubbed one needs adjusting now... Is it safe to adjust it without loosening the wheel nuts? Either that or ride 20 miles on a loose chain.

I dont have anything to check wheel alignment either, not got a plank of wood, will the swingarm notches do?

I need to ride in about an hour, that's why I can't wait

Toby

[instigator]

You'll have to loosen the wheel axle nut to tighten the chain!

In my experience of 125's, if the sprockets aren't alligned right, you will actually be able to tell when you are riding it. You'll feel the back wheel knocking or slightly squirming about.

Is there no marks on the swingarm to tell you what position each side is adjusted to?

Just take it easy.

EDIT: In this case the sinwgarm notches will have to do, you don't want to run the risk of the chain jumping off the rear sprocket and doing some damage (to yourself or the bike) However, don't always trust the notches. They aren't always that accurate IMO.

[Andrewc2oo5zx...]

a bit of wood is what i used, there not hard to find, just wander down ya street
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SUNDERLAND AFC

[veeeffarr]

Ok, going ot have to do it without loosening the axle nut

Also had to remove my exhaust to get to the axle nut, anyone know how to put these pieces of metal back in?

https://www.bikechatforums.com/files/k300i-pic-_32_.jpg

[instigator]

Where abouts did they come from?

Guessing they go against the engine block to stop any gasses escaping?

Sorry about before, slight misunderstanding Personally, I'd go next door and ask him for the correct sized socket.

[lllN30lll]

don't try to adjust it without undoing the axle nuts.

imagine it like somebody holding there arms out in front of them and holding your wheel in there hands, theres no way your gonna be able to move the wheel forwards or backwards in his hands without loosening his hands.



my got that sounded stupid
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Turbo R1
CRF450R

[mr.z]

[lllN30lll]

toby that pic you posted, it isn't a spacer is it? looks to be broken in half
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Turbo R1
CRF450R

[instigator]

No, it's not broken in half, thats how it should be (was like that on a honda rebel 125 that I kept for a while, close enough)

[veeeffarr]

Those two pieces of metal came from the engine, where the downpipes connect to, I can't get them back in?

Crush washer? I don't know what that is, all that came out with the exhaust was those pieces of metal, and there is a ring of metal on the exhaust downpipes that screws into the engine block holding everything in place.

[0ni]

I second instigator, as far as I can remember on my Honda CB125 they just sit inbetween the exhaust port and the exhaust itself.
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Its a lovely day, just wait until some bastard spoils it.

[Kickstart]

Hi

Those look like the exhaust collets. There is a "ring" around the exhaust which the mounting bolts go through into the head. Those collects go between the "ring" and the head. As you tighten the mounting bolts up the collects push on a small lip on the end of the exhaust. There should be a gasket (thick crush washer) between the lip on the end of the exhaust and the cylinder head.

You MUST loosen the wheel spindle to adjust the chain.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[veeeffarr]

[instigator]

[Kickstart]

Hi

Right, see if I can manage to explain this without confusing you!

There almost certainly should be a gasket in the exhaust port. Might well be stuck there.

The gasket goes in there first. Then the end of the exhaust goes in. Hold the exhaust in place and then put the collects around the exhaust, with the lip away from the engine. With those in position put the ring up to the collects and bolt it in place.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[veeeffarr]

Hi Keith,

That's excellent, thanks for the help,

I needed to figure out whether the exhaust slots into the collects, or presses against.

I will just press the exhaust against and bolt that tight.

[Zimbo]

It seems to me that you shouldn't need to remove the exhaust to adjust the chain?

[veeeffarr]

[cagiva gezzer]

https://www.bikechatforums.com/download.php?id=28881

For getting the alignment right, use a tape measure between the swing arm and wheel bolts.
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"because one stroke isnt enough and four strokes waste two"

[Kickstart]

[cagiva gezzer]

Stolen from workshop. I'll let you guess who's got enough cg knowledge to draw it.....
https://www.bikechatforums.com/files/exhaust_pipe_cg.jpg
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"because one stroke isnt enough and four strokes waste two"

[veeeffarr]

Hi,

Thanks guys,

Exhaust bolted back into place, chain lubed to fuck and sorted as much as I can,

Too tired to ride the bloody thing now, but guess I'll have to.

Booking it in to Warrington Motorcycles tomorrow to have the chain and sprockets done by someone not stupid.

Thanks again,

Toby

[Nath]

You should have just gone and bought the right sized spanner. You should have enough space to get a ratchet and socket in without removing the exhaust, however if the wheel spindle is in tight, you will have a fight to bash it out with the exhaust in place.
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Hard livin', hard luck.

[mchaggis]

If tight, the rear axle is a real pain to get out with the exhaust in the way, as there is no room to swing a hammer. The exhaust on a CG is annoying to remove if you don't like sticking your head underneath the engine to see what you're doing. It would be nice if it were just a bolt to take it from the hangar but the whole thing is one piece.

I have never seen an exhaust gasket fitted to a CG125 or a clone engine, but then I haven't taken the exhausts off all that many different ones. All I know is that all of the exhausts I have ever dealt with haven't had any from the word go and they still don't*. (Hence why my diagram hasn't got one shown).

As far as I remember, the best fitting tool I have found for the rear axle (RHS) is a 11/16" ring spanner. A 17mm spanner just about fits too, and a 19mm on the LHS. It is essential to loosen the rear axle or you will just stretch and eventually snap the adjustment studs. It is easiest to fit a new chain without taking the wheel off, but necessary to take the wheel off to fit a new rear sprocket. Loosen the bolts holding the front sprocket on before you do anything else, as you can just jam the rear wheel to keep it still.

Wheel alignment isn't as critical as people make out. It helps though, you can feel it if it isn't right at the rear, you can do it almost by eye by watching how the chain impinges on the teeth and whether it is being pulling to one side of the sprocket.

At the front you get used to the bars facing 30 degrees to the left while you are going straight ahead, though the headlamp facing 30 degrees to the left at the same time wasn't so helpful, nor was the footpeg pointing backwards.

Sorry I couldn't be of help earlier TobyR, I've been offline while packing up my computer and sorting out another.



*I think that might be because the Chinese bike I bought never had them to begin with and the other Hondas were old enough for them to have been lost while removing the exhaust and then not replaced.
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[veeeffarr]

Hi,

Going into garage tomorrow, 19mm didn't fit.

£45 labour

Ouch.