Sprocket nut...

[Brrm!Brrm!]

Hi folks, savage knowledge on here hoping someone can help put my mind at ease or maybe tell me I've bought a horror show😐


Just bought a 2003 Fazer 600 6 days ago - very pleased with it to say the least!


Pretty clean, lowish Kms (40k Kms).


Have done about 800k.s since then, long story boring - it has the old 9mm sprocket nut.


Have had it off just now to see what the thread is like - it appears good to me,doesn't appear to be damaged.


I have the appropriate nut on order (should be here Tuesday 🤞)


Question is - as I was putting the nut back on,nipped it up hand tight.
When I put the socket on it, tightens a tiny bit(with fuck all pressure) then goes loose...


Does this mean I'm in serious trouble or will the upgraded nut cure this/work and actually torque up?


The threads appear perfectly good both on the shaft and the nut itself.
 When this goes bad,is it a case that the nut is gradually wearing the thread as it spins off or would it be noticeabley fucked?


 As in, bare metal/wear marks where once there was thread - am I possibly ok seeing as the thread appears undamaged?


Any pointers,good or bad would be greatly appreciated,it's my only transport so need to get to the bottom of this ASAP!


Have a 200km round trip on Saturday and worried know I know about this, sometimes ignorance is bliss (rode home just over 200km at a fair clip - not a care in the world😅 nursing it the 25km round trip in an out of work now)

[Gnasher]

Question is - as I was putting the nut back on,nipped it up hand tight.
When I put the socket on it, tightens a tiny bit(with fuck all pressure) then goes loose...

The threads must be damaged, they may look ok but are stretched.  Post some pictures?

Does this mean I'm in serious trouble or will the upgraded nut cure this/work and actually torque up?

If the output shaft threads are stretched/damaged, then you'll have to split the motor and replace the shaft I'm sorry to say.

[Brrm!Brrm!]

Thanks for the reply (despite the dire prediction... :'( )


Stupidly, I never thought to take any pictures yesterday before I buttoned everything back up!


Will take pics on Tuesday/Wednesday when the 12mm nut & washer arrives.


 (I put blue loctite on it yesterday when reinstalling it - The bit of jerk/lash I was feeling rolling on/off throttle is gone {for now...} and I don't want to disturb it in the meantime as the bikes my only transport).


I noticed when I was taking it off/putting it back on that there is 2-3 turns that required the socket but closer in, it gets tight to a point but fairly easily goes loose again. Possibly the inner thread is banjo'd and outer is still good?






Have been trying to fined Unfazed's solution to the problem but everytime I see it linked, the link redirects to the home page!


I think he somehow managed to drill the shaft to take a nut after the sprocket?


I was thinking, if possible - drill the 12mm nut and tap this to take a 3mm grub screw and loctite it all in.


Probably fanciful thinking though, dunno if the nut would take a bore like that without fucking it (weld the outer edge after?) or interfering with the actual nut thread let alone would this be in anyway a string enough solution even if possible.

[Trebus]

Have been trying to fined Unfazed's solution to the problem but everytime I see it linked, the link redirects to the home page!


I think he somehow managed to drill the shaft to take a nut after the sprocket?
.

I think the forum fell over and had to be restored. I have the unfazed document. PM your email address and I’ll send it to you.

[agricola]

I know this sounds unlikely, but, you did have a piece of wood or something through the rear wheel and against the swingarm, yes?

[Brrm!Brrm!]

know this sounds unlikely, but, you did have a piece of wood or something through the rear wheel and against the swingarm, yes?




I did indeed....

[Brrm!Brrm!]

Trebus, you're a gent.


Thanks for that!


Not quite the terrifying prospect I was thinking it was.


(I had found Unfazed's fix a couple of days ago but the pics weren't loading then couldn't for the life of me bring it back up...)


There's a Polish mechanic across from the job who I think would be up to this.


Nut arrives in Danfay tomorrow (probably still Tuesday/Wednesday before it lands with me) so if the thread is fucked altogether there seems to be light at the end of the tunnel!

[limax2]

For interest when Yamaha first recognised the sprocket nut problem they told dealers if the thread outside diameter was 17.50 m.m. or greater it was o.k. If less than 17.5 m.m. it needed replacing. The few I've measured in the past were always in the 17.85 to 17.86 range.

[Brrm!Brrm!]

Thanks for the info,will measure the thread all along when I'm swapping the nuts early next week.

[unfazed]

Thanks for the info,will measure the thread all along when I'm swapping the nuts early next week.

I fixed mine by cutting a slot on the shaft and drilled a hole at the end to put a bolt and washer in it. I put what I did in the downloads section, but it seems to be missing.File also explains what else to do to prevent it falling off and stranding you if the fix failsDid this at 71000miles and now 99600miles and had 2 sprocket changes since and thankfully still good.
Message me your email address and I will send the file I put in the downloads to you.

[fazersharp]

I am hoping for you that the bigger nut that grips more thread will work for you. A note that the blue locking liquid is not the correct one to use, cant remember the code but i think the liquid is a green one   

[Brrm!Brrm!]

@Unfazed


Thanks,will pm you now. I've a few questions around drill bits, pressure/speed etc too.


(Trebus has already very kindly sent me the file,which I think is complete but no harm having having it straight from the horse's mouth as it were!)


@Fazersharp
Thanks for the info,will look it up.
The blue stuff (Loctite 2400 medium) is all I had to hand - thought it better than nothing at the very least.


New nut should be here on Tuesday/or Wednesday.


(along with Heed crash bars -€89 Inc free shipping, bargain! And a badly needed screen, anyone here gotten a screen from motorcyclescreens.eu? Polish crowd,hoping it's a good fit/quality,be a pain in the hole to send back)


It's gas,of the 3 bikes I've bought before, I've always done my research beforehand - reviews but especially KNOWN ISSUES...
I probably would have swerved off a Fazer had I have known about this(or at least pulled off the front sprocket cover...) but that being said, it's a cracking bike.


Looks great, lovely smooth engine with good midrange and surprisingly good fuel economy.


Brakes are excellent - I quickly rode my Versys after to park it up for sale and genuinely thought the hose's were busted! Absolutely terrible! Though that bike bike has very heavy engine braking in fairness and gets away with it but still...was shocked with the difference!