Trouble changing a chain - Any ideas

[Kickstart]

Hi

Went to change the chain on Charlottes Triumph Thunderbird today. The nut on the front sprocket won't come off.

Not unusual but this one really won't come off!

I have an electric impact wrench and it hasn't had any effect. The socket has dented the nut but not undone it at all.

Unfortunatly it has spoked wheels and so I can't really chock the wheel against the swinging arm. With the engine in gear and Charlotte standing on the rear brake lever the wheel can still be turned (although it too enough force to be visably bending the breaker bar).

Any ideas? Only think I can think to try is to put in a spare cast wheel from another bike instead and then chock that against the swinging arm.

All the best

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

[MarJay]

[binge]

Ride to a local garage and get a proper Impact Gun on the front nut.




Ben

[Barry_M2]

With the chain on, wedge a (large) piece of wood between the chain the rear sprocket. Then try the breaker bar again, but if your bending it then its probably not gonna budge!

Next thing I'd do is reach for the dremel and chop the nut off.
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ZXR750R (M2) - For the road.
CBR1000 RR4 - For the track.
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[Kickstart]

[Robby]

Are you absolutely sure there isn't some kind of lock tab washer or similar hiding in there, or could the thread be in the other direction?

[The Artist]

Put breaker bar on it resting on the ground.

Start engine, put in 1st and release clutch. I have done this before with no ill effect apart from me being nervous the bike would flip over cue me getting knocked out by a flailing stick of steel

just remembered this was on a bike with sprocket on the other side

Could try it holding the breaker bar and someone else controlling the bike.

[BenR]

Are you sure you're going the right way? Sounds stupid I know but are you sure it isn't a reverse thread?
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Current bikes: suzuki RG125UN wolf. Yamaha MT-07

[Kickstart]

Hi

I am sure on the thread direction. You can just see the end of the thread. There is a tab washer and I have peeled it back. And double checked several times that there isn't another tab!

Clutch slave cylinder is on the sprocket cover and no way I want my leg near the breaker bar there without any way to disconnect drive. Added to which it would tighten the nut.

All the best

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

[binge]

As a last resort, Heating the nut up would almost guarantee it undoing.

You'd need a replacement up though really.





Ben

[Kickstart]

[Bendy]

I used a lot of freeze n release on the seized CBR nut, that and 4 battery charges of the impact wrench finally got it off.

[Kickstart]

[G]

My air wrench is significantly 'better' than the electric one (electric 210NM or so and air 485NM or so)... as can be seen by Bendy needing four charges worth, it seems .
Despite the denting the nut thing, I suspect a decent air one would help.

[stinkwheel]

[jay12329]

As bend says several treatments with freeze and release and a long time on the impact driver. The SV took a bit of work to get off. But we got there with a couple of batteries work of bashing!

Are you using an impact socket or a normal one? I dinted the nut on the sv using a normal socket but a (black halfrauds) impact one was better.
HTH
J

[jay12329]

Oh and Kickstart asking for help in the workshop?!!?? I'm in a parallel dimension or something!

J

[Pete.]

I'd go for the 'fit a cast wheel and put a lump of wood through the spokes' option, and use a long bar & impact socket. Last resort is cut the side off the nut right alongside the shaft.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Kickstart]

Hi

My air impact wrench will manage 450lb/ft for undoing things. The electric one will undo things that the air one won't, despite in theory being a fair bit weaker.

Splitting the nut is a last resort.

I am using a proper impact socket.

All the best

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

[Kickstart]

[stinkwheel]

I'd be interested to hear if the rotafix technique works on motorbikes too.

They get a good hold, I've heard of people stripping the threads on their hubs before by overenthusiastic rotafixing (and it's a 1.37" x 24tpi thread, not insubstantial).
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[G]

[teabag]

One little point, if trying to lock the back wheel by putting it in gear, use top gear not 1st.
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NS125R = 2 years > GSX600F = 7 years > XR125L = 3.5 years > SV650S........and a Citroen Synergie HDI for the kids.

[trisers]

[Kickstart]

Hi

Only way I can do it would be with a Dremel and it would be too easy to damage the output shaft. While I don't have a large enough nut splitter, even if I did I don't think there is enough clearance around the nut to use one.

All the best

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