shaft/ front sprocket help~ 2003 R6

[BamR6]

hey techies...need some help again. quick background of my problem. I was riding and the nut that holds on the front sprocket came off at some point (lost) resulting in the front sprocket coming off and tearing up the threads on the shaft (that the nut screws onto) basically, I have a nut from my old engine but I need to re-thread the shaft. Thing is I dont know what size it is or the thread count or anything else. And on top of that I cant find a metric die big enough that would fit the shaft. If you guys have any helpfull info, tips, etc. I would greatly appriciate it. Thanks.


P.s. I bought a 250 :cool .....Its black and red and matches my R6.....my girlies learning on it :shhh

[stangmx13]

repost... ya im def not buying an 03 R6

http://www.bayarearidersforum.com/forums/showthread.php?s=&threadid=188792
http://www.bayarearidersforum.com/forums/showthread.php?s=&threadid=189758

[PyRo1509]

well u cant rethread it to the same one.
You will have to go smaller.

[ALANRIDER7]

Originally posted by PyRo1509

You will have to go smaller.

This is a bad idea.

[Stormdragon]

Originally posted by ALANRIDER7
This is a bad idea.

:laughing Understatement of the week! :laughing

[BamR6]

....help.....??? so 18x1 then?? MAN I just had the stupid eninge replaced too! I missed all last summer riding, and now this :cry :cry

[#1Freak]

you need a new shaft, ther is so little thread on that thing, and it is very fine. with as much force as that thread and shaft take, i do't think there is any way around getting a new shaft for it. how did the nut come off, did you not have the lock washer on there?

Brian

[ALANRIDER7]

Originally posted by BamR6
MAN I just had the stupid eninge replaced too! I missed all last summer riding, and now this :cry :cry

Who replaced the motor? Was there a new countershaft sprocket put on at the time? It would be a standard thing to at least check the sprocket torque during the job.

[BamR6]

skip actually did the motor swap for me, and I havnt touched the front sprocket/shaft till the nut came off. As far as I know its the original front sprocket from the engine. So im not quite sure how it came off, it was a used engine off a guy that crashed, and did have slight other problems. I'd rather not have to take out the engine again, especially if I have to split the case and everything. would it be that bad of an idea to do some sort of a temporary fix, at least tilll I have the time and money to buy a new bike or fix teh engin again, preferrebly after summer???

[Stormdragon]

Originally posted by BamR6
I'd rather not have to take out the engine again, especially if I have to split the case and everything. would it be that bad of an idea to do some sort of a temporary fix, at least tilll I have the time and money to buy a new bike or fix teh engin again, preferrebly after summer???

I can sympathize, but look at it sensibly for a moment. Short of welding the sprocket to the output shaft, (no I'm not recommending this!) would you ever really feel confident that the sprocket wouldn't come loose again? Would you want to be 200 miles from home when the sprocket did come loose? Wouldn't you rather own a machine that you knew you could jump on and manage to get a good ride on?

If you get all your gaskets, oil seals, and that output shaft together before you start the repair, it should be a 1 day turnaround for a good mechanic.

[ALANRIDER7]

Originally posted by BamR6
I'd rather not have to take out the engine again, especially if I have to split the case and everything. would it be that bad of an idea to do some sort of a temporary fix, at least tilll I have the time and money to buy a new bike or fix teh engin again, preferrebly after summer???

Don't be penny wise and pound foolish.

If you try to 'cheap' your way through this, there's a decent chance you'll end up in a bodycast or worse.

Don't cut corners. They cut back.

[oldapeman]

I notice all the comments saying that you need to replace the shaft have been given without knowing if you just bunged up the threads at the end a little bit, or if a fair portion of the threads are trashed. If you could post a picture it might help before a final judgment is made on the ned to replace the shaft.

Yes, the guy who swapped your engine out last time shoulda had this nut torqued properly, and the lock washer bent up to keep it from happening. Normally, the front sprocket is removed, then reinstalled as the chain is placed onto the sprocket, so he probably was the last guy to touch this part. If it were me, I would be talking to him about making this right.

[mercurial]

just weld it, this was already established as the best course of action in previous threads.

[07chuck]

Everone make mistakes...


Some are more expensive than other....

[BamR6]

I think im gonna try and re-thread for starters, if that honestly fails, then I will review my options. but for now, if anyone happens to know the size and pitch that would help greatly.

[elskipador]

i know its been over a year but i'm pretty sure i torqued that nut. never had 1 fail before. there is something i've seen done, twice, by someone who knew what they we're doing..... drill and tap the center of the output shaft, like the honda's do from the factory. both times i saw it was on a POS ATV that really wasn't worth replacing the shaft. so they center punched it and drilled, tapped, for a bolt. might work? not sure on a bike with over a 100hp. worked fine on a 30hp single 250 honda ATV. just a thought. :teeth

[BamR6]

I dont blame you for the incident by any means, so no worries there. As for tapping it for a bolt, im not sure it would work unless I cut the shaft flush with the sprocket (if Im fully understand what your saying), so i'd like to start with trying to just re-thread the shaft.

Now I've found out the size of the nut (18mm) but need to know for sure what the thread count is on that so I can buy the right size die.