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Old 11-30-2008, 05:44 AM   #1
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Default Lock rear wheel, change front sprocket

People often find it difficult to stop the rear wheel from spinning when they are trying to break loose the factory-over-torqued nut which holds down the front sprocket.

To stop the rear wheel from spinning, people have suggested:

1. Deflate the rear tire, then stuff rags between the tire and the front of the swing arm, and then re-inflate the tire.

2. Get another person to sit on the bike and press the rear brake pedal down to lock the rear wheel.

3. Insert something like a broomstick through the spokes, above the swingarm.

I changed my front sprocket yesterday. Not having another person handy at the time, I tried #1, without success. I did not try #3, as I was afraid that I could bend a spoke or two.

This is what I did to keep the rear wheel from spinning:

I inserted some strong cord down in front of the swingarm (just behind the shock absorber), led it back to the rear wheel, passed it through the lower/forward part of the rear wheel (behind a spoke nipple), and then led it back and down through the front of the swing arm again. I did that several times with one length of cord, passing the cord behind a different spoke nipple each time, in order to divide the load between two or three nipples. Then, I tied the ends of the cord together. The bike did not budge when I had to apply more than 160 foot pounds of torque to the sprocket nut to break it free. Nor did the spokes bend at all.

I offer the procedure as a suggestion which works well.



It was an easy solution to a tough problem.
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Old 11-30-2008, 05:48 AM   #2
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Default Re: Lock rear wheel, change front sprocket

i just take the chain off, and then put it in first gear.
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Old 11-30-2008, 07:09 AM   #3
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Default Re: Lock rear wheel, change front sprocket

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Originally Posted by mcfear View Post
i just take the chain off, and then put it in first gear.
That would not have worked with my bike. The engine would just have turned over. It required more than 160 foot pounds of torque to break the nut free.

Also, using the method I suggest, the transmission and clutch do not have to bear the strain of the torque that has to be applied to break the nut free.

To each his own, I guess.

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Old 11-30-2008, 08:21 AM   #4
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Default Re: Lock rear wheel, change front sprocket

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i just take the chain off, and then put it in first gear.
that is an exelent way to bust the gears. hehe!
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Old 11-30-2008, 08:43 AM   #5
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Default Re: Lock rear wheel, change front sprocket

Just use an impact. Just my though.
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Old 11-30-2008, 11:50 AM   #6
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Default Re: Lock rear wheel, change front sprocket

ride an older bike.. then it's just two small bolts instead of one big nut.
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Old 11-30-2008, 11:52 AM   #7
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Default Re: Lock rear wheel, change front sprocket

It's funny how an impact can overcome the littlest of issues...lol
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Old 11-30-2008, 04:39 PM   #8
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Default Re: Lock rear wheel, change front sprocket

or the largest impacts lol, hey scott. instead of DUCK!!!!! its DEER!!!!!!!

on mine i got a fairly knobby rear on (its a 250 so not as much compression) and have only had to take chain off and do it that way once, but i have the 2 nuts on it instead of the one. and it didnt take much, definately not 160.

are all the single nutters out there on that tight?
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Old 11-30-2008, 04:47 PM   #9
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Default Re: Lock rear wheel, change front sprocket

I think I remember hearing of another technique. Stuff a rag between the front sprocket and chain. Turn nut till it jams then go ahead and give it hell. I'm interested to see what others think of this idea.
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Old 11-30-2008, 05:12 PM   #10
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Default Re: Lock rear wheel, change front sprocket

that sounds like it would work, but might take a bit of turning. what about an old tire tube. would take less to make it lock i woulda thought
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2006 DR650 blue one
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1994 KLR250 - barbie color scheme. (SOLD)
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Old 11-30-2008, 06:52 PM   #11
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Default Re: Lock rear wheel, change front sprocket

my nut was verry tight (single)
i would have damaged the gears for shure,having no inpact wrench
i had to beat the living sh1t out of it
could not believe the pounding it took to undo that sucker
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Old 11-30-2008, 07:22 PM   #12
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Default Re: Lock rear wheel, change front sprocket

fair enough.
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Originally Posted by MSGT-R
McFear, you're turning into one hell of a mechanic!
the master of the KLR250 said that ^^^
2009 CB400 -Red/White/Blue TriColoure
2006 DR650 blue one
2005 KLR650 - Red/Black (TOTALED )
1994 KLR250 - barbie color scheme. (SOLD)
1974 Honda CB250 twin cylinder - blue
1970 something, honda minitrail 50cc monkey bike. - red
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Old 11-30-2008, 08:06 PM   #13
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Default Re: Lock rear wheel, change front sprocket

Quote:
Originally Posted by KLR-dude View Post
my nut was verry tight (single)
i would have damaged the gears for shure,having no inpact wrench
i had to beat the living sh1t out of it
could not believe the pounding it took to undo that sucker
With the very tight ones (I measured the torque on my '04, using a torque wrench, as exceeding 160 foot pounds), an impact might not be too good for the transmission, either -- just my opinion, unsupported by personal experience, because, being the cautious guy I am, I didn't try it -- and because I don't have an impact.

But it just takes a minute to tie the rear wheel to keep it from moving, using the method I have suggested.

That works very well, and none of the torque is transmitted to the transmission.

Also, when you are re-torquing the nut after having replaced the sprocket and lock washer, do not to allow the engine to rotate backwards. Tie the rear wheel again, moving the loop of cord to the front/top of the wheel. Distribute the load between two or three spoke nipples.


Last edited by MotoMo; 11-30-2008 at 08:25 PM.
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Old 11-30-2008, 08:24 PM   #14
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Default Re: Lock rear wheel, change front sprocket

Quote:
Originally Posted by Spiderman View Post
I think I remember hearing of another technique. Stuff a rag between the front sprocket and chain. Turn nut till it jams then go ahead and give it hell. I'm interested to see what others think of this idea.
That would generate tremendous tension on the chain, as the chain would try to ride over the lump of rag stuffed between it and the sprocket. Could that do damage to the countershaft and wheel bearings? I dunno.

I think it could also bend the chain, if the chain, being disengaged from the sprocket teeth, slipped over the lump of rag to one side or the other of the sprocket. I think it could also result in a severely jammed up mess.

A section of inner tube would very likely be cut to shreds by the chain and sprocket.

I guess you can tell I am impressed by how much torque it took to break the countershaft nut free. The nut must have been installed originally by a pair of crazed gorillas on amphetamines and steroids.

Last edited by MotoMo; 11-30-2008 at 08:28 PM.
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Old 11-30-2008, 08:36 PM   #15
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Default Re: Lock rear wheel, change front sprocket

Where is scott anyway? It has been more than 24 hours since I have seen a post from him! I think we are supposed to worry after 4 hours with him. What did he kill now?

Quote:
Originally Posted by mcfear View Post
or the largest impacts lol, hey scott. instead of DUCK!!!!! its DEER!!!!!!!

on mine i got a fairly knobby rear on (its a 250 so not as much compression) and have only had to take chain off and do it that way once, but i have the 2 nuts on it instead of the one. and it didnt take much, definately not 160.

are all the single nutters out there on that tight?
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Old 11-30-2008, 09:05 PM   #16
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Default Re: Lock rear wheel, change front sprocket

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Originally Posted by MotoMo View Post
With the very tight ones (I measured the torque on my '04, using a torque wrench, as exceeding 160 foot pounds), an impact might not be too good for the transmission, either -- just my opinion, unsupported by personal experience, because, being the cautious guy I am, I didn't try it -- and because I don't have an impact.
don't doubt that any shop would use an impact gun.

i'm not saying it's a GOOD thing for frequent abuse... but occasional use probably won't be a problem.

nothing wrong with the trick of tying up the rear wheel that i can see however, and it would eliminate any stress being transferred to the transmission.
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Old 11-30-2008, 09:51 PM   #17
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Default Re: Lock rear wheel, change front sprocket

Me, I just situated myself on the right side of the bike and depressed the rear brake pedal with my foot.

Then I leaned over with a long breaker bar and...

Presto!
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Old 11-30-2008, 11:05 PM   #18
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Default Re: Lock rear wheel, change front sprocket

Bingo nooner!

Let's see...I'm looking for a simple device to keep the rear wheel from moving. Hmmm... What could possibly work?

Super glue? Not a big enough tube on hand...

Rig up a tow chain, lawn chair and a magnifying glass? No lawn chair...

Mr. T? No. I lost his phone number...

Rear brake?

Even if you've already cut the old chain, you can re-run it and ziptie it together so that top run of chain is under tension.
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Old 12-01-2008, 01:18 AM   #19
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Default Re: Lock rear wheel, change front sprocket

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Originally Posted by 2wheelsrbest View Post
Bingo nooner!

Let's see...I'm looking for a simple device to keep the rear wheel from moving. Hmmm... What could possibly work?

Super glue? Not a big enough tube on hand...

Rig up a tow chain, lawn chair and a magnifying glass? No lawn chair...

Mr. T? No. I lost his phone number...

Rear brake?

Even if you've already cut the old chain, you can re-run it and ziptie it together so that top run of chain is under tension.
I don't think you would have broken my bike's nut free by standing on the rear brake. I tried it. When it takes more than 160 foot pounds to break the nut free, you begin to wonder when you are going to damage that not very strong rear brake lever. It's better, in my opinion, to just tie the rear wheel down, and avoid the strain on things like brakes and transmissions.

Anyhow, I'm not looking for an argument. Just trying to make a helpful suggestion. To each his own.


Last edited by MotoMo; 12-01-2008 at 01:21 AM.
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Old 12-01-2008, 02:06 AM   #20
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Default Re: Lock rear wheel, change front sprocket

the rag stuffed inbetween would slip with the chain. would need to remove the chain for the teeth to grab the rags. but it could take a hell of a lotta rag maybe.
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McFear, you're turning into one hell of a mechanic!
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2009 CB400 -Red/White/Blue TriColoure
2006 DR650 blue one
2005 KLR650 - Red/Black (TOTALED )
1994 KLR250 - barbie color scheme. (SOLD)
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