Triumph Speed Triple Forums banner

Check your bloody front sprocket nut

2 reading
22K views 65 replies 29 participants last post by  Canon  
#1 ·
There have been quite a few posts wherein members have found their front sprocket nut loose.
Well I took off my sprocket cover off (just five bolts) and sure enough the nut was loose. Only the tab (lock) washer kept it from unscrewing completely.
Some blue loctite and a torque of 132nm plus the tab washer will hopefully keep the bugger in place, but I'll be keeping an eye on it.
CHECK YOURS NOW
 
#6 ·
Hi Avi8tor.
Just checked mine. Guess what? It was loose. Held on by the bent over washer...... There was a whole load of chain lube stuck to the underside of the cover there too. I mean loads; 3 years worth.
MH
 
#8 ·
MONKEYHANGER said:
Hi Avi8tor.
Just checked mine. Guess what? It was loose. Held on by the bent over washer...... There was a whole load of chain lube stuck to the underside of the cover there too. I mean loads; 3 years worth.
MH
Got a scottoiler so a lot of oil gets flung into that sprocket cover.
Bike was parked up an incline and left a H*rl*y size pool of oil. So when I got home took off the sprocket cover to check if oil would continue to leak. Yeah lots of grunge in there. Anyhows no oil dripped but noticed the nut was loose.
The nut has a recess in it, the inner recess abuts against the output shaft and the outer part of the nut against the sprocket. My mech reckons that there isn't enough contact between the shaft and the inner recess, each time you engine-brake the sprocket tends to 'unscrew' the nut.
He came across this problem quite frequently on Kawis. His solution was to grind off a wee bit off the sprocket nut (ie make it slightly thinner)
Anyhow I've used some loctite and we'll see howgozit. If it loosens again I'll have to pull out the surface grinder....:)
 
#9 ·
Well wtf? I just checked mine and it is loose too! Couple of questions

1) That bent lip on the washer, do you need to pry it all the way up (like with a screwdriver)?

2) What size is that bolt? I don't currently have anything in my socket set near big enough to fit on it. Do you use socket wrench on it, box wrench etc?
 
#10 ·
1) Yes, and FOR NOW needs loctite on the thread.
2) Dunno size, you can always measure it with a vernier or similar, but it definately needs a socket and a BIG torque wrench.......132nm. Bike in grear and rear brake applied. Rear wheel nut is 146nm just to give you an idea how tight that nut should be, a box wrench won;t cut the mustard.
 
#11 ·
Avi8or said:
1) Yes, and FOR NOW needs loctite on the thread.
2) Dunno size, you can always measure it with a vernier or similar, but it definately needs a socket and a BIG torque wrench.......132nm. Bike in grear and rear brake applied. Rear wheel nut is 146nm just to give you an idea how tight that nut should be, a box wrench won;t cut the mustard.
Thanks for #1. Problem is I need to go to hardware store and get the right size socket. I guess I could take a ruler to it but I hate doin guess work. Can anyone pls tell me the size of that socket?
 
#19 ·
APtech77 said:
Most likely 42mm. Devious?
How the hell am I supposed to remember the socket size I used on one bolt back in late 2005? I can't remember What tools I used last week. I do remember having to get The Blonde to help with holding the bike when I torqued it in place, and thinking I should have used green Locktite instead of red.

Can you say CRS... I knew you could. ;)
 
#22 ·
Yeah, just spent a whole week wrenching on speedy... I WAS going to enjoy a few weeks of riding her, but noooooo you guys have to go and tell me about this new problem that I have to spend a precious hour or two in the garage turning wrenches instead of riding her..... THANKS fuckers! :devil:
 
#23 ·
Isn't that the same as the headstock bearing? If so I've got a wrench for it.