front sprocket removal

[dansher]

hey all,

trying to replace the chain and sprocket on my 93 cbr250 and i cant get the bolt on the front sprocket undone, tried putting it in gear and using the brake and it doesnt work, had a go at it with an impact drill thingo and wont undo,

anyway i was wondering which way do u undo it? is it a reverse thread?

thanks heaps

[Aduro]

Not a reverse thread. Lefty loosey that bitch. You already tried rattle gunning it?
Put it in neutral, chuck a bit of wood between one of your rear wheel spokes to lock it against the swing arm ( you can mess shit up if you put to much force through the gearbox) and get yourself a big fuck off breaker bar, or a long bit of pipe to put over the handle of your wrench.

[dansher]

thanks for the fast reply, just tried that then, it must really be on there coz it wont budge its just starting to round off the head

[shockdesign]

Probably locktite on it, you'll need to apply some heat to it to break the seal.

[mootavic]

make sure you use a 6 sided socket if the thread is rounding off. should be able to get a cheap set from supercheap...

also, short sharp pushes/pulls work better. a very very long breaker bar also helps...

[dansher]

ok, blow torch? is it safe to do? will it damage any oil seals or anything?

im using a 14mm socket that isnt a 6 sider but it feels a bit loose, do you know if its definitely a metric bolt?

cheers

[Aduro]

I wouldn't go a blow torch that close to fuel lines etc etc. I'd heat up the actually nut with a jet lighter. Definitely use the tightest fitting socket you can. Also lol Moot you know as well as anyone that cheap sockets are a shitty fit.

[dansher]

(22/07/2011 11:49)Aduro Wrote:  I wouldn't go a blow torch that close to fuel lines etc etc. I'd heat up the actually nut with a jet lighter. Definitely use the tightest fitting socket you can. Also lol Moot you know as well as anyone that cheap sockets are a shitty fit.

yeah i was thinking of using a jet lighter but my old man didnt think it would heat it up much lol, shows what they know.

guess im going shopping in the morning for a socket

im also planning on taking the rear wheel off and getting a new tyre fitted while im doing this, is it as easy as it looks to get the back wheel out or is there anything i need to know about it?

thanks for all your help

[Aduro]

its pretty simple.
Support rear of bike
loosen axle nut.
Wind chain adjusters (2 of) in so that you have max slack in chain.
Lift chain off sprocket.
Unbolt rear calliper ( wheel comes out without doing this but its a slut to get back in with the calliper attached.)
Support wheel and knock axle out with mallet or hammer wrapped in rag.

[mootavic]

a cheap 6 sider is better on a rounding nut than the best 12 sider...

got an impact driver? use that if you do...

if not, buy one. cheaper than a good long breaker bar anyway...