CB72 - It lives!
in [Classic Motorcycles]
|
Prev: FOAK: Best way to clean the inside of a steel motorcyle tank?
Next: SO Boxer Oil Filter Removal
From: Mike Buckley on 19 Mar 2010 14:56 In message <3s17q51o8okq8erkdu0sio3sr55u2n6cns(a)4ax.com>, Champ <news(a)champ.org.uk> writes >On Thu, 18 Mar 2010 22:46:12 +0000, Mike Buckley <Mike(a)hotmail.com> >wrote: > >>Bad form etc. The pilot jet fixed the idle problem but can anybody >>explain when ignition advance should kick in? The CB has a spring >>mechanism on the cam shaft which advances the ignition, on mine it >>appears to be advancing as soon as you open the throttle, I thought >>advance happened higher up the rev range? > >Yeah, but only a tiny bit higher up; my dim memory says that full >advance should be at about 2,500 rpm, or perhaps even a little lower, >so you don't need hardly any throttle (in neutral) for that. I need to ride the thing to see if it's worth pursuing the advance timing further I think. Being unable to adjust the front brake so I can push the bike with it off and not push it when it's fully on is proving somewhat of a challenge at the moment, so no test rides. -- Mike Buckley RD350LC2 CB72
From: Terry Richards on 20 Mar 2010 04:19 "Mike Buckley" <Mike(a)hotmail.com> wrote in message news:1DRp3IPp3yoLFwQN(a)hotmail.com... > Weak advance springs ... > ..can be replaced, possibly without removing the camshaft, but even so the > engine has to be dropped in the frame. > It's been a while but aren't they behind the points plate? I don't see why you would have to drop the motor or do anything with the cam. T.
From: Mike Buckley on 20 Mar 2010 07:16 In message <4ba484f7$0$17883$ba4acef3(a)reader.news.orange.fr>, Terry Richards <terryr999(a)wanadoo.fr> writes > >"Mike Buckley" <Mike(a)hotmail.com> wrote in message >news:1DRp3IPp3yoLFwQN(a)hotmail.com... > >> Weak advance springs ... >> ..can be replaced, possibly without removing the camshaft, but even so the >> engine has to be dropped in the frame. >> > >It's been a while but aren't they behind the points plate? I don't see why >you would have to drop the motor or do anything with the cam. > >T. > > They're on the camshaft in the middle of the top of the engine, only way to get them is to drop the engine in the frame so the top cover can be removed to get access. -- Mike Buckley RD350LC2 CB72
From: Terry Richards on 20 Mar 2010 13:26 "Mike Buckley" <Mike(a)hotmail.com> wrote in message news:pwUerBi55KpLFwYa(a)hotmail.com... > In message <4ba484f7$0$17883$ba4acef3(a)reader.news.orange.fr>, Terry > Richards <terryr999(a)wanadoo.fr> writes >> >>"Mike Buckley" <Mike(a)hotmail.com> wrote in message >>news:1DRp3IPp3yoLFwQN(a)hotmail.com... >> >>> Weak advance springs ... >>> ..can be replaced, possibly without removing the camshaft, but even so >>> the >>> engine has to be dropped in the frame. >>> >> >>It's been a while but aren't they behind the points plate? I don't see why >>you would have to drop the motor or do anything with the cam. >> >>T. >> >> > > They're on the camshaft in the middle of the top of the engine, only way > to get them is to drop the engine in the frame so the top cover can be > removed to get access. > It's weird that I don't remember that and I'll be damned if I can think of any reason to put them there. I'm not disputing your word, it's just plain weird. T.
From: Mike Buckley on 20 Mar 2010 19:49
In message <4ba5055a$0$17866$ba4acef3(a)reader.news.orange.fr>, Terry Richards <terryr999(a)wanadoo.fr> writes > >"Mike Buckley" <Mike(a)hotmail.com> wrote in message >news:pwUerBi55KpLFwYa(a)hotmail.com... >> In message <4ba484f7$0$17883$ba4acef3(a)reader.news.orange.fr>, Terry >> Richards <terryr999(a)wanadoo.fr> writes >>> >>>"Mike Buckley" <Mike(a)hotmail.com> wrote in message >>>news:1DRp3IPp3yoLFwQN(a)hotmail.com... >>> >>>> Weak advance springs ... >>>> ..can be replaced, possibly without removing the camshaft, but even so >>>> the >>>> engine has to be dropped in the frame. >>>> >>> >>>It's been a while but aren't they behind the points plate? I don't see why >>>you would have to drop the motor or do anything with the cam. >>> >>>T. >>> >>> >> >> They're on the camshaft in the middle of the top of the engine, only way >> to get them is to drop the engine in the frame so the top cover can be >> removed to get access. >> > >It's weird that I don't remember that and I'll be damned if I can think of >any reason to put them there. I'm not disputing your word, it's just plain >weird. > The points bolt directly onto the head, removing them just reveals more of the end of the camshaft, to get at anything else the top covers need removing which means dropping the engine in the frame or removing it completely. When the top cover is removed you can see the cam lobes, the tops of the valve springs and the advance mechanism which I think is around the same place the two parts of the camshaft are locked together. -- Mike Buckley RD350LC2 CB72 |