front sprocket removal

[el_oso]

what do you do when a 120psi air impact gun doesn't want to get a front sprocket (bolt) off?
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Duke 390
Previous: '05 XR125L | '96 XJ600S Diversion |'05 Suzuki GSXR1000 | '05 Honda CBR125-R | '97 YZF 600R Thundercat | '11 Honda CBR250
Car: Jeep Wrangler 4.0L

[Fizzer Thou]

I would use a three leg puller like these

https://www.toolstation.com/shop/Automotive/Mechanics+Tools/Gear+Puller+Set+3+Piece/d60/sd180/p79243
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Just talk bikes.What else is there?

Always have a 'Plan B'

[Blau Zedong]

[Fizzer Thou]

The OP says get the sprocket off - nothing about the bolt.

But - if the bolt is difficult to shift,put the chain back on,put the bike in gear with a lump of wood through the spokes and resting on the top of the swing-arm,hold the back brake on and undo the retaining nut/bolt.

Is there a tab washer holding the nut against the shaft?
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Just talk bikes.What else is there?

Always have a 'Plan B'

[Suntan Sid]

Breaker bar, exert as much pressure as you can, while a mate wallops the end with a mallet.

Are you sure you're Unscrewing in the right direction?
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"Everybody needs money, that's why they call it money!"

[MG]

[Blau Zedong]

[MG]

[Fizzer Thou]

[lihp]

Have you folded tabs back on the washer if there is one?

[el_oso]

thought it was obvious because of the use of the air gun.
just for clarification, it is the retaining bolt. tried a 5/6ft breaker bar and air gun from a workshop.
it's not my bike, asking on behalf of one of the guys in the university motorcycle club. i haven't had a look or a go myself, but before i start suggesting splitting the bolt, want to know what else to try.
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Duke 390
Previous: '05 XR125L | '96 XJ600S Diversion |'05 Suzuki GSXR1000 | '05 Honda CBR125-R | '97 YZF 600R Thundercat | '11 Honda CBR250
Car: Jeep Wrangler 4.0L

[map]

<wrote a lot of waffle so edited it out>

Impact drive or applying some heat perhaps.


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...and the whirlwind is in the thorn trees, it's hard for thee to kick against the pricks...
Gibbs, what did Duckie look like when he was younger?

[Suntan Sid]

You need to "shock" the nut to break any corrosion holding it in place, hence walloping the end of the breaker bar with a mallet, while the breaker bar is under tension.
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"Everybody needs money, that's why they call it money!"

[el_oso]

apparently he took it down a different workshop this afternoon. came straight off. thanks guys
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Duke 390
Previous: '05 XR125L | '96 XJ600S Diversion |'05 Suzuki GSXR1000 | '05 Honda CBR125-R | '97 YZF 600R Thundercat | '11 Honda CBR250
Car: Jeep Wrangler 4.0L

[Johnser]