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Messages - Johnwebley
Pages: 1 ... 211 212 [213]
3181
« on: June 07, 2013, 11:07:17 AM »
It's quite unusual to break rings on a 4 stroke engine if everything is normal, possibly more influenced by the assembly last time it was built.
Also a possibiltiy if it had been stored for a long time for the bore/rings to rust and cause damage when someone tried to start it.
the history,I have owned the bike since 1977, the barrels have never been disturbed,the head came off about 20k miles ago,after I damages a couple of valve stems while changing the cam-chain,the bike gets regular use,although only between 2-3,000 a year,
3182
« on: June 06, 2013, 07:35:13 PM »
OK,update,
so I took the head off,
looked like Foreign object damage in cylinder No4,
lots of marks both on piston,and head,
valves removed,good seals on inlets valves and seats,exhaust seats good,but valves in need of lapping,
not happy about state of No4 piston,so off with the barrells, result,top ring broken,and 50% vanished !!big damage to top ring groove,
and top land,
No3 piston also has broken top ring,???
1 and 2 pistons OK,
no marks on bores,
ordered new (std) piston, 4 X sets of rings,
waiting for them to arrive,
SQ, why do you think the rings went ??
John
3183
« on: May 27, 2013, 02:08:23 PM »
looks like a head-off job !!
just as summer is finishing!! LOL
3184
« on: May 26, 2013, 06:27:02 PM »
No Honda since the late 60's needs leaded fuel, if you have a sticking valve without you have the start of a mechanical problem mate
OK,its runs well,got just over 52K miles,great starter,etc, what could be the issue ?
3185
« on: May 26, 2013, 03:25:53 PM »
I have recently been forgetting to add "lead substitute" to the fuel,
and have got what appears to be sticky valve !!!
as the motor get warm/hot,after cruising around 6K rpm for several miles ,the engine runs rough,noisy tappets,and feels like its on 3 only,
spitting in the carb,and spitting in exhaust.I still have 4 - 4 pipes,
after checking,setting tappets at 3th inlet/4th exhaust,and re-using Morris lead substitute again,the bike runs well again,
is it common?
if so,I hope you take notice,and use an additive as well,
John Webley
PS,I should say I have a '74 CB500/4. and the handbook does say it needs "some" lead in fuel
3186
« on: May 15, 2012, 09:12:41 PM »
Putting oil in the silencer would be okay IF you weren't using it, but it'll smoke like a 2 stroke when it warms up! 
also,try never to ride for shorter distances than 10 mls,and always get the pipes very hot,I will make you smile as well, just a thought,both David Silver,and CMSNL,have the pipes in stock,at present I think the dutch site is the cheapest
3187
« on: May 15, 2012, 09:03:37 PM »
you can always try a reverse fill/prime,
detach caliper,remove piston,fill caliper with fluid,then insert piston,press in,and watch the bubbles appear on the mastercylinder,.
this may be a drastic last resort.
sometimes,if you use just one pad in the caliper,and pump it full,then push the piston all the way in,this also helps to dislodge air .
John
3188
« on: October 27, 2011, 07:59:52 PM »
thanks for the welcome,just for that,you get a pic of the LH side!!! 
3189
« on: October 27, 2011, 07:47:50 AM »
hi,I am John from the west midlands,only 12miles from the welsh border and all those smooth great roads,
I have owned the CB500-4 since about 1977,it is M plate and has just over 50K mls on it,
99% standard,appart from H4 headlight,Boyer ignition,and great Avon tyres.
John.
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