F650 GS '00 Front Sprocket Nut

[derildo]

Hi all
1st question on this form. I have recently bought my F650 GS and am attempting to change the front sprocket from a 16 to a 15 tooth.

Silly question: Is the nut a righthand thread so will undo anti clockwise?

I have flattened the lock washer and tried to undo the nut with a metre long breaker bar which bends with the effort! Both brakes on and in 1st gear.
I have ordered a gas torch attachment so as to put a bit of heat on the thread as there may be a bucket of threadlock in there.

Any advice welcome

Cheers Derek

[Hoffs]

Just done it on my 2002 GS.
Front sprocket is right hand and is torqued to 140Nm. Mine needed a fair amount of heat from my heat gun but did shift eventually.
It should have been put on with blue locktite but if previous owner used red then its going to take heat before it will shift.
Good luck

[kuyajonathan]

I was lucky, tightened mine upto break seal, before undoing.
If PO used red locktite, Heat Gotta the answer.
Few on here able to undo without bother, seems no loctite used

[derildo]

I will try tightening up to see if that does the biz. Thanks for the tip.

[FreddieTre]

As a general question to all members, is the use of a ratter gun an option for undoing front sprocket nut?

Cheers Alf

[Dakardave]

I haven't changed mine on the bm but wants wrong with tab washers instead of loctite ? Ratter gun, not heard that before presume impact drive named cos of rat a tat tat. Like it.

[derildo]

Hi All,
Got it undone on Saturday, 2 man job, I held the brakes and my mate Bertye attacked the nut with a 30mm socket, 3/4" extension and tommy bar pivoting on some blocks of wood.
Could not see any loctite residue. Fitted the 15 tooth sprocket after cleaning splines and threads on shaft and nut. Bit of grease on splines, loctite 243 on thread.
Thanks for all the advise. Now onto the next problem!
regards
Derek