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Re: Clutch or trans?
Posted: Thu Oct 29, 2020 5:22 am
by Rob Frankham
SteveD wrote: ↑Wed Oct 28, 2020 7:25 pm
Not yet Rob
Work is in the way at the moment.
Spline looks fine, just dry.
Looking at the length of the flat swarf, I'm wondering if an edge of one of the gears has snapped off and as it was being processed to its current size and shape if there wasn't a partial lock of the gears? I had the clutch in pdq and there was a momentary jolt of the bike then it settled.
Good luck... don't let work get in the way of the important things in life
... Let us know what you find.
Rob
Re: Clutch or trans?
Posted: Thu Oct 29, 2020 7:05 am
by gspd
Whoa! Looks almost too big to have just fallen out of the drain hole on its own.
You've got me stumped.
Initially I was thinking it's part of the selector mechanism, but a with a chunk like that gone, some gears surely wouldn't work.
My only guess is that it's possibly one of your shifter fork arms, and that the broken fork is still shifting with its one remaining arm.
Exploratory surgery will tell all, keep us posted.
Re: Clutch or trans?
Posted: Thu Oct 29, 2020 8:53 am
by SteveD
gspd wrote: ↑Thu Oct 29, 2020 7:05 am
Whoa! Looks almost too big to have just fallen out of the drain hole on its own.
You've got me stumped.
Initially I was thinking it's part of the selector mechanism, but a with a chunk like that gone, some gears surely wouldn't work.
My only guess is that it's possibly one of your shifter fork arms, and that the broken fork is still shifting with its one remaining arm.
Exploratory surgery will tell all, keep us posted.
Yes I will. Thanks for the opine.
I might look in with a scope...I need to come up with a plan to remove the flange nut. maybe Charlies https://www.bmbikes.org.uk/viewtopic.ph ... er#p147657
Re: Clutch or trans?
Posted: Thu Oct 29, 2020 6:45 pm
by Airbear
G'day Steve. I've been watching and am well intrigued.
If you send me your mailing address I'll pack up the nutcracker tools (made by Jeff) and entrust them to OzPost.
Re: Clutch or trans?
Posted: Thu Oct 29, 2020 7:48 pm
by daz
Very nice of you, ol' timer!
Re: Clutch or trans?
Posted: Thu Oct 29, 2020 10:46 pm
by SteveD
Done Charlie. Thanks!
I bought something from Dandenong, 24kms a month ago. Took 3 weeks.
I bought some engine parts for my other project from Motorworks, 17000kms took 7 days.
I bought some flywheel bolts yesdee from Munich Perth 3000kms ? got 'em today.
Bethanga to Croydon ~300kms...we'll see. 
Re: Clutch or trans?
Posted: Fri Oct 30, 2020 5:25 am
by SteveD
A thought re that piece of swarf...the damaged trans has a kicker. I'm wondering if something might've come off that?
Re: Clutch or trans?
Posted: Fri Oct 30, 2020 6:45 am
by gspd
It didn't occur to me that your 81RS had a kickstarter.
If the kicker no longer works, BINGO!
Re: Clutch or trans?
Posted: Fri Oct 30, 2020 6:51 am
by SteveD
gspd wrote: ↑Fri Oct 30, 2020 6:45 am
It didn't occur to me that your 81RS had a kickstarter.
If the kicker no longer works, BINGO!
It never worked, or more accurately, it might've started the bike once over 15 years ago. I never use it except to maybe move the flywheel and even then I prefer the rear wheel for that task.
Re: Clutch or trans?
Posted: Fri Oct 30, 2020 7:17 am
by SteveD
The kicker feels more loose, less resistance to movement. That's the culprit. I looked in with a scope and there's fresh small bits of metal in the base.
Bonus...had a better look thru the box of tools and there's a flange puller in there. 
Charlie...I hope you haven't posted just yet?