Forgot to install part AFTER assembly

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Larso1

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Oct 17, 2013
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Oh man, the worst. Ever do something like this? Replaced 21T C/S sprocket with new 20T sprocket. Torqued down the securing nut on shaft to 70 fT/lbs. Reassembled entire primary chaincase with clutch, new alternator, et.al...... and then saw the oblong safety securing washer, with screw, that fits over the securing nut for the C/S sprocket. NOOOOOOO!!! Looks like at least a day lost (minimum for me anyway) and will probably tear the inner chaincase to crankcase gasket when I separate them (glued on with Yamabond). And I was so close to getting it all done. :(
 
I know how you feel, should I or shouldn't I bother?

you have decided to bother and do it

15 years ago I decided not to and just left it off, been fine ever since

suppose some day if I need to get in there again I will put it on.....
 
1up3down said:
I know how you feel, should I or shouldn't I bother?

you have decided to bother and do it

15 years ago I decided not to and just left it off, been fine ever since

suppose some day if I need to get in there again I will put it on.....
Click to expand...

Yup, that's where I'm at. Should I take a chance? With my luck it'll back off and tear up the inner chaincase. I presume Norton put it there due to past (bad) experience. It is very tempting to leave it off though... :|
 
There was none on the last bike I bought and I logged about 1500 miles before I found out. No telling how many miles the po put on it like that either.
 
RennieK said:
There was none on the last bike I bought and I logged about 1500 miles before I found out. No telling how many miles the po put on it like that either.
Click to expand...

Talk me out of tearing it down guys, talk me out of it.. :lol:
 
It never takes as long the second time as you think it will. I hate to have to do something twice but it is always worth it for the peace of mind!
 
Well that's why the large sprocket nut is left-hand threaded.

But since you now have the proper shims fitted behind the inner primary cover and the clutch center, disassembling/reassembling
again shouldn't be too much of a hassle.

Put the retaining washer and screw back in place. Maybe a smear of silicone sealant on the retainer too.
Good luck with it!
 
That HUGE nut must be tight. Also note that one side of it has tiny bevelled edges that go against the sprocket face. Then fit the retainer carefully tightening/loosening a tad for the little screw to line up with one of 2 little holes. So have a drinky and a cry and do it all over again. :oops:
 
Very few have ever done such a thing and should be ashamed admitting in public, sheeze.
The big ole sprocket nut should not be nearly as tight as the manual lists so 40-50 lb more than plenty enough and even w/o any torque or even a nut the chain holds in inline of drive so forgetabout it and ride while ya can. It ain't going no where with the over toque ya applied, but clutch nut and crank nut should always be a concern so carry what ya need to get primary cover off to nip back up if comes off or it nut damaged remove it to prevent more damage and ride more easy home to fix. Oh yeah I've put the sprocket on backwards once but that don't count same way, does it?
 
If YOU are uncomfortable with leaving it out, go back and put it in. From your post, IMO, you won't be comfortable until you do… :)

It won't get you out of re-doing it but an option to consider is to safety wire the fastener and forget about that washer. I personally prefer that method but again, do what you think is the best approach.
 
OK, well after reading these posts I guess I will have to suck it up and take it apart again. Peace of mind is well worth it. Curiosly, when I ttok the saftey washer off to remove the sprocket, the big nut was VERY easy to remove, certainly no 70 lbs on it. Oh well, live and learn. Thanks for the responses.

Bill
 
Hey, I replaced every part on my rebuild at least 3 times for everything. Don't feel bad. It felt like I was rebuilding a Brough.

Dave
69S
 
You're not alone. I did a very similar thing: I must change the sleeve gear bushings and had hoped to leave the gear box in place. I stripped it down to the actual sleeve gear and I believed the primary case had to come off. A lot of sweat and cursing to remove the engine sprocket, primary chain and case only to find the bushings could have easily tapped out with the case still in place. A lot of extra work and I have to try to replicate the original seal, which was good..

Lessons learned. Its why we enjoy them. Zen and the Art of Motorcycle Maintenance.

BC
 
I can't remember all the times i left some thing out or put in wrong way and buttoned up to face facts, or took off stuff I didn't need too, so ain't no short cuts for this half fast Commando mechanic. At least the 2nd or 3rd time usually goes smoother. Also too often just fixing the instant issue and closing up often misses something else that should of been attended to when so close at hand or discovered by accident taking more apart than needed to end up more time and money involved that expected. I am lazy at heart so its extra brain pain to force myself to be a mechanic on about anything but Commando sure helped my discipline in rest of life tasks, interfering with more never ending Commando fettering. I do remember putting sprocket on backwards once, ugh.
 
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