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Changing front Sprocket?

 
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SportBikes Canada

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Since: Dec 04, 2003
Posts: 14



(Msg. 1) Posted: Sun Feb 29, 2004 1:33 pm
Post subject: Changing front Sprocket?
Archived from groups: rec>motorcycles>tech (more info?)

whats involved in changing a front sprocket.. is it easy... or should I have
a dealer do it for me?




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bowman

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Since: Aug 01, 2003
Posts: 578



(Msg. 2) Posted: Sun Feb 29, 2004 1:33 pm
Post subject: Re: Changing front Sprocket? [Login to view extended thread Info.]
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SportBikes Canada wrote:

 > whats involved in changing a front sprocket.. is it easy... or should I
 > have a dealer do it for me?

If you're asking, maybe you better let the dealer do it. In theory, it's
easy. Since you don't mention what the sprocket is on, I'll assume the
worst case. First, spend an hour or three figuring out how to remove the
bodywork to get to the sprocket. Then' spend a little more time getting the
guard or whatever off. Notice that you don't have a wrench to fit the large
nut, and ChannelLoks aren't going to do it. Put the bike back together and
go to the parts store for the tools.

Get back home, take it apart, lean on your shiny new socket, and learn about
the virutes of a liberal application of red loctite by some bored factory
dweeb. Pick the bike up, since all you've done with a big wrench is to turn
the entire drive train and move the entire bike forward off the kickstand.

Place a piece of pipe through the read wheel to prevent futher excursions.
Find 4 feet of pipe for a breaker bar extension, and apply maximal effort.
Note the spokes bending.

Scan the internet, and drop back to plan B. Remove more bodywork so you can
get a sparkplug out. Cut down the wife's clothesline and stuff the
cylinder. With an absolutely immobile bike, apply more torque to no effect.

Scan the net some more. Borrow the pissed off wife's car, go to the hardware
store and buy a propane torch. Come home, fire up the torch. Note that a
considerable amount of gas dripped out when the bike fell off the stand and
is now burning fiercely. Call the fire department. They get there too late
to save the garage, but at least the house is only lightly singed.

Find that the new bike you've bought with the insurance money comes with a
brand new sprocket.


Best case scenario: it'll take about 15 minutes including adjusting the
chain.<!-- ~MESSAGE_AFTER~ -->

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Geribaldy1

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Since: Jul 27, 2003
Posts: 77



(Msg. 3) Posted: Sun Feb 29, 2004 5:40 pm
Post subject: Re: Changing front Sprocket? [Login to view extended thread Info.]
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Probably easier to change the sprocket than to guess what bike you are on about Smile


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SportBikes Canada

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Since: Dec 04, 2003
Posts: 14



(Msg. 4) Posted: Sun Feb 29, 2004 5:40 pm
Post subject: Re: Changing front Sprocket? [Login to view extended thread Info.]
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haha
mybad
its a 98 YZF 600.. not R6

and I want to go down a tooth in the front.. fron 15 to 14




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Canada's SportBike Hangout

"Geribaldy" <reply.TakeThisOut@ddressnotvalid.now> wrote in message
news:ABo0c.5191$jh7.72563803@news-text.cableinet.net...
 > Probably easier to change the sprocket than to guess what bike you are on
about Smile
 >
 >
 > ---
 > Outgoing mail is certified Virus Free.
 > Checked by AVG anti-virus system (http://www.grisoft.com).
 > Version: 6.0.598 / Virus Database: 380 - Release Date: 28/02/04<!-- ~MESSAGE_AFTER~ -->
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Mark Olson

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Since: Jul 18, 2003
Posts: 1653



(Msg. 5) Posted: Sun Feb 29, 2004 5:40 pm
Post subject: Re: Changing front Sprocket? [Login to view extended thread Info.]
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SportBikes Canada wrote:

 > "Geribaldy" <reply RemoveThis @ddressnotvalid.now> wrote in message
 > news:ABo0c.5191$jh7.72563803@news-text.cableinet.net...

  > > Probably easier to change the sprocket than to guess what bike you are on
 > about Smile

 > its a 98 YZF 600.. not R6
 >
 > and I want to go down a tooth in the front.. fron 15 to 14

I'd be careful about making the front sprocket any smaller than a
15T. Smaller diameter sprockets are harder on the sprockets and
chain. You'd do better to make the rear two or three teeth larger.

<a style='text-decoration: underline;' href="http://www.google.com/groups?selm=slrnaoh7mu.8ev.idr%40ax9.hep.ucl.ac.uk" target="_blank">http://www.google.com/groups?selm=slrnaoh7mu.8ev.idr%40ax9.hep.ucl.ac.uk</a>

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'01 SV650S '81 CM400T '99 EX250-F13<!-- ~MESSAGE_AFTER~ -->
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Kaybearjr

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Since: Jun 21, 2003
Posts: 661



(Msg. 6) Posted: Mon Mar 01, 2004 4:41 am
Post subject: Re: Changing front Sprocket? [Login to view extended thread Info.]
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 >From: "SportBikes Canada" msportbikes.TakeThisOut@yahoo.com

 >whats involved in changing a front sprocket.. is it easy... or should I have a
dealer do it for me?

After you've done several jobs yourself, you'll know whether you've got the
necessary mechanical talents to
try more difficult jobs...

If you're going to be a do-it-yourselfer, you need a Yamaha shop manual, or, at
least a Chilton, Clymer, or Haynes manual...

You'll need to support the rear wheel off the ground with a swing arm stand,
and you'll have to at least remove the lefthand lower fairing so you can get at
the front sprocket cover, which must be removed...

The shift lever probably has to be removed to get the sprocket cover off. Put
the bike into high gear before you
remove the lever and the cover...

Then you can bend the ears of the sheetmetal washer under the sprocket nut (a
hammer and flat-bladed screwdriver will to the job) so you can get a socket
wrench onto the nut. You'll need a fair sized ratchet wrench and extension or
breaker bar and extension to loosen the nut, and you'll need a torque wrench to
re-install the nut...

The torque is probably about 43 foot-pounds---but check the manual to be
sure...

When you're ready to break the nut loose, stick a 2-foot long piece of 2 X 4
through the rear wheel's spokes, above the swing arm, to keep the rear wheel
from turning...

Or, if you have a friend to help, have him step on the rear brake pedal...

Then, use your breaker bar and socket to loosen the front sprocket nut. After
the nut is removed, loosen the rear axle and the rear wheel adjusters, and push
the rear wheel all the way forward to take tension off the chain...

Then you can slip the chain off the old sprocket and install your new sprocket.
You might want to clean all the road grit and grease out of the area before
putting the new sprocket on...

When you want to tighten the nut, move your 2 X 4 underneath the swing arm and
through the spokes, or have your friend step on the rear brake pedal again...

The recommended torque for tightening the sprocket nut will be found in the
shop manual...<!-- ~MESSAGE_AFTER~ -->
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