OZ ATV :: The Australian ATV Forum

[fastbenni]

hi all, i'm new to this forum and new to owning a banshee. i've never owned bikes before and after owning my banshee for only 2 weeks, i've struck my first problem. i can't undo the nut that holds on the front sprocket. i had a 3/4 inch ratle gun that is rated to 900 foot pounds and it won't budge it. i thought it was coming but after marking the nut and the shaft i found that i was twisting the shaft( the chain/sprocket were not moving and the nut/shaft were twisting together) very scary!!! has anyone else encounted this and how did you solve it? my next idea is to try heating the nut and try again, failing that i would cut the nut and sprocket with a grinder trying not to damage the shaft. hopefully the shaft is not stuffed already. any help for this newby would be greatly apreciated. by the way, it's an 02 with 50 thou rebore, fmf's, nerfs etc if you were wondering. thanks

[doorslammer]

are you sure the shaft was twisting? you weren't turning the whole motor/gearbox over were you?

try some heat and use a big bar with a pipe over the end, a rattle gun might be a bit rough on the gearbox if the nut is that tight. how are you stopping the sprocket from turning?

sorry, but if it started to twist the shaft from the gearbox i would split the cases and replace that.
the last thing you want is to be doing 90kp/h and that shaft to fail, it would probably take out your cases and that's gunna cost more $$$. not to mention if your leg gets in the way and the sudden stop that will occur after the chain locks everything up.
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01 Banshee
Never take life seriously. Nobody gets out alive anyway

[fastbenni]

i left the chain on and the bike was out of gear so i couldn't damage the gearbox. i put a scratch on the nut and the shaft, thats how i found them moving together. the socket was slowly turning and the guy beside me couldnt see the chain moving. if the shaft was twisting, it must be between the sprocket and the nut unless it was chewing out the thread on the sprocket. the rear of the banshee was also strapped down fairly tight on my trailer so i think it would have been dificult to spin the tyres as the rattle gun was doing its thing. it even stretched the chain. i'm going for a ride tomorrow so hopefully the shaft doesn't break as you described. will heat destroy any seals behind the sprocket? i'm not sure whats there. thanks.

[doorslammer]

yes there is a seal, but that one can easily be replaced with the whole motor together and still inside the chassis, no biggy if you burn it. although you shouldn't need to put that much heat into it.

also let some good penetrating oil soak into it overnight,

i don't see that shaft twisting, i would have thought i would have just snapped straight out, but i'm no expert in metals

i hope it doesn't break as well, good luck with it and let us know how it goes
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01 Banshee
Never take life seriously. Nobody gets out alive anyway

[1sick6]

this might sound stupid ,but did you bent the back the retaining washer tab? and were you undoing it the right way??

it shouldn't be that tight.. good luck


Paul
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He Who Dies With The Most Toys, Wins

[bigjon]

1SICK6 wrote:

this might sound stupid ,but did you bent the back the retaining washer tab? and were you undoing it the right way??

A 3/4 rattle gun would obliterate that washer if that was the cause.
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Don't close your eyes during the crash, you'll miss the best part

[mickbundy]

Please do not take this wrong
You are going the right way ?? I have seen this done many a time on jobs in the mining industry.Also bigjon if the socket goes over the nut and washer tab it will become one. No offense meant just asking Cheers

[fastbenni]

yeah a bent the locking washer flat and i rang a bike shop to make sure it wasn't left hand thread when i couldn't get it loose. tried both ways anyway. took the shee to the bike shop when i couldn't get it undone and he couldn't get it with his rattle gun either but his was 1/4 of the size of the one i used. i don't think he beleived me when i told him what rattle gun i used. the bloke that owns the rattle gun is a truck driver and uses it to loosen pinion bolts on the diffs of his truck. the gun has never failed him until now. i went for a ride today and everything seems ok for now. the amount of time i spent looking at the sprocket while riding is boardering on paranoyer.i'm thinking of playing ignorant for now and leaving the sprocket on until it is stuffed (hoping the shaft doesn't break while riding). i was only trying to remove it to gear it up a bit. i'm looking for some traction so i can beat my mates 450 husky although wheel spin is heaps of fun. thanks heaps for your replies and i'll keep reading here in case 1 of you as any other ideas.

[bigjon]

mickbundy wrote:

Also bigjon if the socket goes over the nut and washer tab it will become one.

It was said in jest.

Also, if it fitted over the nut and washer tab the incorrect size socket was being used. And if that was the case a 3/4 impact gun would have done a nice rounding job of the nut.

This would have been noticed by fastbenni I would think.
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Don't close your eyes during the crash, you'll miss the best part

[mickbundy]

It was said in jest.

OH earth humour ha ha ha

[banshee_jaquesy]

ive never seen one that tight!! ive only REALLY looked at 5 banshee sprocket nuts but they are all pretty much loose!! if a 1000ftlb 3/4in rattle gun cant take it off theres somthing very wrong! i have one at work and its never failed before, even on like 50mm bolts!!! i can only suggest using an oxy to heat it up abit and maybe give the nut a sharp hit with a hammer (not the thread) and maybe try a breaker bar or the rattle gun again?? other than that..... give it to yamaha so they can wreck it and pay for it lol. good luck.
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2000 YAMAHA BANSHEE.

[Barney]

You could always use a nut splitter , which you can obtain form most good tool shops , , it goes over the nut and has a point on it to which you wind in and it splits the nut , so as it can be removed from the thread
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2012 Can am Outlander Xt 1000cc
Can Am Full set of Armour ,Grip and thumb warmer
Fox Podium Shocks and springs front and back
GME Tx 4600 UHF with Helmet Mic
Hema Gps

[Barney]

Have found one on the net this will give you an idea what it looks like , you can pick em up at supercheap for around 40 bucks

http://www.toolfetch.com/Category/Hand_Tools/Splitters/Nut_Splitters/575-FA-289.htm
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2012 Can am Outlander Xt 1000cc
Can Am Full set of Armour ,Grip and thumb warmer
Fox Podium Shocks and springs front and back
GME Tx 4600 UHF with Helmet Mic
Hema Gps

[fastbenni]

hmmmm, nut splitter just might work. i will buy 1 of those before i try again. that way it will undo easily without even using the nut splitter. thats murfy's law. spend the money and you won't need the tool. thats my luck anyway. thanks for that idea grizzly, thats exactly why i posted this thread.

[doorslammer]

make sure you get a yamaha nut for the sprocket as well cause the have a lip on the inside, dont know if its necessary but its there.
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01 Banshee
Never take life seriously. Nobody gets out alive anyway