CG125 E - Snapped chain has smashed part of the casing

hollisharri · L Plate Warrior Joined: 19 Aug 2015 Karma :

Just posting for a bit of advice.

I bought a CG125 E from gumtree and planned to ride it back home (about 200 miles).

I got about 30 miles when the chain snapped. It was just half of one link but it kicked off the sprocket. I had no tools so had RAC come out. The mechanic shortened the chain and moved the rear wheel in. Everything seemed fine.

About 40 miles later, it happened again, only this time it snapped in half and jammed up against the front sprocket. I also, to my horror, discovered the swing arm pivot bolt had lost its nut and vibrated halfway out the frame. (but that's not the issue).

After getting home via recovery vehicle, I took the flywheel cover off to free the chain and discovered that some of the casing had cracked off inside. Pics below. It looks like the flywheel chamber is still sealed so I'm hoping it's something I can ignore, but I thought I'd ask. Pics below:

https://i.imgur.com/kOG2wc2.jpg
https://i.imgur.com/bXcrGAC.jpg
https://i.imgur.com/sYZFNfR.jpg
https://i.imgur.com/JVhhEcN.jpg

There also appears to be some play on the front sprocket but I'm waiting on some tools to arrive before I can check that out properly.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

That damage wont bother the bike. That piece of casting is there to stop oil being flung off the front of the chain.

So clean in there, I'd suggest the chain hasn't been oiled for years/since new.

If it were me, I'd glue a bit of bent metal plate to the remains of that casting to keep the lube where it's supposed to be and leave it at that.

Needless to say, check everything else.

Someone's been at the flywheel...
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hollisharri · L Plate Warrior Joined: 19 Aug 2015 Karma :

Thanks, I was hoping that was the case.

Vincent · Banned Joined: 16 Oct 2006 Karma :

If you can get in with a drill, you could drill a small hole for a self tapper to hold something in place to fill the hole. It doesn't have to be metal, plastic should do it. Strange the chain snapped twice, it may be worth checking that the wheel isn't moving in the swingarm for some reason.
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hollisharri · L Plate Warrior Joined: 19 Aug 2015 Karma :

I could probably mount something to the cover that extends down. I'll give it a go when I replace the chain and sprockets.

I think the chain snapped due to fatigue initially. Then the second time it may have been a combination of that and overtightening - the tension seemed spot on but I think the RAC guy might have overtensioned it when he tightened the axle bolts.

base · Trackday Trickster Joined: 09 Nov 2004 Karma :

Rac should never of shortened the chain IMO, my biggest concern will be if the shaft has been bent due to the chain stuffing itself into the casing, happened to me years ago on a fz600 had to have a new shaft put in.

DrSnoosnoo · World Chat Champion Joined: 28 Mar 2012 Karma :

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

mudcow007 · World Chat Champion Joined: 01 Feb 2012 Karma :

why the damage on the flywheel??

has bodyguard ever owned a CG Shocked

hollisharri · L Plate Warrior Joined: 19 Aug 2015 Karma :

Thanks for the input chaps.

Bought myself a did chain and sprocket set to replace what's on the bike. Also investing in a Haynes manual and torque wrench and will make sure everything's tightened to spec.