Unitrack removal / strip-down?
in [UK Motorcycles]
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From: Muck on 1 Sep 2008 11:20 T i m wrote: > Myford ML10 and some steel / ally stock in the workshop (and I like > finding genuine reasons to use the lathe). > >> You can also get aftermarket retrofit nylon bushes to replace the >> needle rollers, but these don't last as long in service. > > Ok. Nylon bushes? They lasted a few months on my scooter, I got some proper phosphor bronze bushes turned up, and a couple of grease nipples put in, so I could grease the thing on a regular basis.
From: T i m on 1 Sep 2008 14:05 On Mon, 1 Sep 2008 15:37:48 +0100, "JB" <nil(a)spam.net> wrote: >> p.s. Do I just drop the Unitrack link off the monoshock, frame and >> swinging arm or is there anything to do on the damper top mount >> please? > >You can leave the shock in place (at the top mount anyway). That's what I tried, but alas the only bolt I couldn't get out was the lower monoshock bolt, so the Unitrack / Monoshock has just come out as a lump. I've just given it a Gunk down and might get back in the workshop later and see if I can tempt that bolt out. The bolt is loose enough (as in turning round and moving back and forth a bit but won't actually come out). I'll give it a jiggle, lube and some gentle swearing and see what happens. ;-) All the best .. T i m
From: T i m on 1 Sep 2008 14:10 On Mon, 01 Sep 2008 16:20:13 +0100, Muck <Muck_REMOVE_(a)tallbloke.net> wrote: >T i m wrote: > >> Myford ML10 and some steel / ally stock in the workshop (and I like >> finding genuine reasons to use the lathe). >> >>> You can also get aftermarket retrofit nylon bushes to replace the >>> needle rollers, but these don't last as long in service. >> >> Ok. > >Nylon bushes? They lasted a few months on my scooter, I got some proper >phosphor bronze bushes turned up, and a couple of grease nipples put in, >so I could grease the thing on a regular basis. Those were they days eh Muck, when such things came with grease nipples, none of this 'sealed for life' nonsense. Mind you, that seems to suit our disposable age? But maybe that will change soon. As the base material becomes more expensive and the energy required to machine them goes up as well, maybe more folk will look to repairing stuff again ... ? All the best .. T i m
From: T i m on 1 Sep 2008 16:19 On Mon, 1 Sep 2008 14:16:49 +0100, "JB" <nil(a)spam.net> wrote: >> I read somewhere (a GPz forum) that the Unitracks should ideally be >> stripped, cleaned and lubed once in a while? >> >Yup. Ideally every 10-15k miles. That way you know it will come apart next >time. Ask me how I know this. First, the good news, it's all stripped down and cleaned (well the Unitrack itself, I've not removed the drop links from the swinging arm yet). Some 'news' is that all the bearings are black nylon (or a plastic of some sort). The ok news is the front bearing (were the Unitrack joins the frame) is in fairly good nick and all slid out pretty cleanly and lubed. The medium news is the middle bushing (the swinging arm links) isn't very pretty. I've cleaned it up a bit but it's still quite pitted. The worse news is the bushing that joins the monoshock is quite rough (even when cleaned it's quite pitted). I assume if it was a real needle roller bearing then it would all be lubed up with a lithium grease etc. Being nylon these bushes probably shouldn't be lubricated and hence if water gets in, the steel rusts and we get the problems. :-( Based on the idea that soft wears hard, I wonder if I made replacement bushes in brass they would work better against the nylon than steel (but would they be strong enough)? <shrug> All the best .. T i m
From: JB on 1 Sep 2008 18:22
"T i m" <news(a)spaced.me.uk> wrote in message news:uhiob41qnap7lfmqesucbjsu6n05fvul7d(a)4ax.com... > On Mon, 1 Sep 2008 14:16:49 +0100, "JB" <nil(a)spam.net> wrote: > > >>> I read somewhere (a GPz forum) that the Unitracks should ideally be >>> stripped, cleaned and lubed once in a while? >>> >>Yup. Ideally every 10-15k miles. That way you know it will come apart next >>time. Ask me how I know this. > > First, the good news, it's all stripped down and cleaned (well the > Unitrack itself, I've not removed the drop links from the swinging arm > yet). > > Some 'news' is that all the bearings are black nylon (or a plastic of > some sort). > > The ok news is the front bearing (were the Unitrack joins the frame) > is in fairly good nick and all slid out pretty cleanly and lubed. > > The medium news is the middle bushing (the swinging arm links) isn't > very pretty. I've cleaned it up a bit but it's still quite pitted. > > The worse news is the bushing that joins the monoshock is quite rough > (even when cleaned it's quite pitted). > > I assume if it was a real needle roller bearing then it would all be > lubed up with a lithium grease etc. Being nylon these bushes probably > shouldn't be lubricated and hence if water gets in, the steel rusts > and we get the problems. :-( > > Based on the idea that soft wears hard, I wonder if I made replacement > bushes in brass they would work better against the nylon than steel > (but would they be strong enough)? > They were originally all needle rollers, so someone's already swapped them out. Just machine some more bushes up in Nylatron. I've got a metre or two of ~30mm dia at work I can let you have a few bits of if you like. Email me at jMbyrne_AT_greenyonder_DOT_co_DOTuk (changing the colour to blue obviously). JB |