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Offline MickyC51

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Front sprocket
« on: June 11, 2019, 03:48:07 PM »
I got a 16 tooth front sprocket and trying to take the nut off to release the sprocket. I'm using an impact gun and getting no where. Is it reverse thread? Do I have to heat it? Is there a lock somewhere I'm missing? I did bend back the locking washer.
Micky Curry
2018 Kawasaki Z900,  2016 Yamaha FZ09
2011 KTM Supermoto 990, 2007 Aprilia SXV 550,
2016 Zero FX

Online ras

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Re: Front sprocket
« Reply #1 on: June 11, 2019, 06:15:08 PM »
*Originally Posted by MickyC51 [+]
I got a 16 tooth front sprocket and trying to take the nut off to release the sprocket. I'm using an impact gun and getting no where. Is it reverse thread? Do I have to heat it? Is there a lock somewhere I'm missing? I did bend back the locking washer.

some of them are a bitch  :151: :151:
I am assuming you are using an elec impact ? I would try a 3' beaker bar with a 2x4 through the wheel

Offline MickyC51

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Re: Front sprocket
« Reply #2 on: June 11, 2019, 10:58:26 PM »
Okay I cheated. Fitting a 2x4 was going to be a pain getting the brake line, fender out of the way so I went down to my local shop and had Jay loosen the bolt. he did say "that was one tight mother f-er" It's time to make dinner for the wife so I'll change the sprocket in the morning.
Micky Curry
2018 Kawasaki Z900,  2016 Yamaha FZ09
2011 KTM Supermoto 990, 2007 Aprilia SXV 550,
2016 Zero FX

Online ras

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Re: Front sprocket
« Reply #3 on: June 11, 2019, 11:16:48 PM »
*Originally Posted by MickyC51 [+]
Okay I cheated

That is called using your head ....sometines they are a completely ridiculous

Offline MickyC51

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Re: Front sprocket
« Reply #4 on: June 12, 2019, 04:18:37 AM »
This one was. I have an air impact gun but it's older so maybe it's not quite what it was. I thought the 2x4 was a good idea but the brake lines and fender were in the way. The fender screws were behind the muffler doable but WTF. That's when I caved luckily my local shop was close so I could just stop by. Of course there were life complications in the way but it's done. In the morning I'll put the sprocket on go for a ride and let you know what I think. Thanks.
Micky Curry
2018 Kawasaki Z900,  2016 Yamaha FZ09
2011 KTM Supermoto 990, 2007 Aprilia SXV 550,
2016 Zero FX

Offline zed9

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Re: Front sprocket
« Reply #5 on: June 12, 2019, 02:48:14 PM »
I've seen a 2x4 put unwanted pressure on swingarms and wheel spokes.
The absolute worst cs sprocket I ever had to deal with was my 650 Versys. That thing was grossly over tightened at the factory.

I put the transmission in NEUTRAL then I press down hard on the rear brake then tie wire the brake lever down. This keeps all forces between the front and rear sprockets via the chain without impacts to the gears in the transmission.
In the Versys trouble, I used a 1/2 inch electric impact for a minute to no avail.
So I put my 1/2 inch breaker bar on with a four foot extension pipe. I practically lifted the whole back of the bike off the ground. I had the front strapped. The bike was vertical.
When the sprocket nut finally broke free it sounded like a gun shot. I actually thought I broke the countershaft itself.

Had I used a 2x4 I would have dented the Versys swingarm. It is light gauge aluminum. I torqued the new sprocket to factory spec and never had a problem. You can easily break a 90 ft/lb torqued nut with a 1/2 inch breaker bar alone using the method I described above.
« Last Edit: June 12, 2019, 02:50:19 PM by zed9 »