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Messages - Johnwebley
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3151
« on: August 12, 2013, 10:14:32 PM »
I know this is headed CB750 exhausts,
but the 500/550 Hm 323 are short supply,DS has none,CMSnl has sets,very expensive,
I asked a guy at DS,he said they were looking to get sets made,but no information yet,
mine are 20yrs old,and getting scruffy,can expect then to corrode soon
CMsnl 500 sets are 1808 euros,on their conversion,£1,555 VAT included
must get my piggy bank filled
3152
« on: August 12, 2013, 06:09:41 PM »
hi ,
I have CB500-4
I had problems of the brake rubbing to much,pads not retracting,
I cured it by replacing the piston seal,nice fresh and flexible,it pulls the piston back
a treet,
also,if you remove the spring from the adjuster,and let the caliper move as it needs,it
inproves the braking,
the seal cost about £3.50 ish
3153
« on: August 10, 2013, 08:22:39 PM »
Always worth posting events! I'd love to do the Yeovil one as it's only 40 mins up the road, but recently had major surgery for colon cancer, not even allowed to lift a full kettle at the mo! And I've been told unlikely to be able to ride again this side of xmas  so I've missed the best spell of biking weather for years!
hope you get well soon, sorry you seem to be missing the warm,sunny days and dry roads, for those tat are interested, the Yeovil event is 15th september. see link, http://www.japfest.net/
3154
« on: August 10, 2013, 12:15:49 AM »
hi al
I recently posted about the Calne bike day,
in about 5,000 bikes,only 2 SOHC Hondas,and 1 was mine,
there is a bike day at Brackley ,Northhampton,on the 18th august,
also at Sparkford ,near Yeovil,home of the Haynes museum,
do any of you guys use your bikes?
want to meet informally,
do you want more info?
I live near welsh border,about 80miles from Calne,and Brackley,and 100 from Yeovil.
other venues are about,
what do you think?
is it worth posting a few events??
John
3155
« on: August 08, 2013, 11:09:00 PM »
mine have lasted well,
I get about 4,500 from the rear,and just about run 3 rears to one front !!
the front will need changing soon,
the walls are ok
as I said,love the grip,can ground the footrest on roundabouts,and very stable on fast open roads,
still running original rear shocks after 52K and 39 yrs
3156
« on: August 08, 2013, 06:21:06 PM »
great bike,
if you swop the tyres,I use the avons,roadrider AM 26 front and rear,running 29psi front and between 33-36 psi rear,
they have transformed the handling,very sharp,great edge grip,and wet/greasy grip,
recently got some FA013 EBC pads,after servicing the caliper,and new fluid,found them very dissappointing,until a ride in heavy rain,
this seemed to clean the pads,so much better now,
enjoy the summer,and ride as much as your can,
John
3157
« on: July 30, 2013, 07:31:43 PM »
hi all went to the Calne bike day, was amazed that there were so few Sohc bikes there, apart from my CB500/4 ,I only saw one other,a late model CB650 custom, no 400's,usually very plentifull,neither any 750's, took me all day to walk around enjoying the day, well worth a visit,a great charity day out, http://www.gazetteandherald.co.uk/news/picturegalleries/gazettepics/calnebikes/view/gallery_353377.Calne_Bike_Meet_2013/http://www.calnebikemeet.com/
3158
« on: July 22, 2013, 03:05:39 PM »
hi all, are any of you going to Calne ?? would be good to see lots of classic SOHC, mine will be there, check out the link, John, http://www.calnebikemeet.com/about.html
3159
« on: July 17, 2013, 09:23:09 PM »
Thats not detanation as the cause, what happens is some idiot PO reved the nuts off it when cold and the rings expand to quickly so the top one shatters into pieces, this widens the ring groove then flame passage and heat finish it off.
Used to happen quite a bit on 250K4 and CB175's
I had exactly this on a 550 years ago. My friend bought a bike that had been standing for a year or so. Unfortunatley, the seller had taken the bike for a blast to make sure all working OK. My friend bought the bike but soon complained that it wasn't running properly and was smoking. When I investigated I discovered that there were broken rings on all four cylinders. Luckily, they had stayed in place and not scored the bore and a new set was all that was needed.
thanks for the hints !! I can't remember racing it when cold, BUT,from now on will keep it below about 5k for a couple of miles at least, thanks John
3160
« on: July 15, 2013, 10:18:43 PM »
update,
firstly thank you all for your help and advise,
the bike is back together,just over 600 miles,runs beautifully,got its top end back,
runs up to 9k very willingly,
oil change done,no issues,seems so much more in the lower gears,
I rev it in the 2nd,3rd , and 4th gears,dont slog it in top,
and I am really pleased
John
3161
« on: July 04, 2013, 08:29:00 PM »
they could contact me,
my CB500 is running ok now,
also has 4 pipes,
very original,un-restored ,52k miles
ask them to E-mail me for pics
John
3162
« on: June 25, 2013, 11:45:27 PM »
update, all back together, started first time. felt really tight,the new rings are steel,see link,look for motorcycle rings http://www.npr.co.jp/english/products/p_train/index.htmlI expect these to be stronger,less brittle,and more durable than old style cast rings after about 130 miles,gentle throttle no more than 5k under load,and 6k on overrun the motor feels much better,still a little tight,but very torquey will continue till about 500 miles before any serious throttle,increasing the revs under light load
3163
« on: June 12, 2013, 06:41:28 PM »
John,
I recently had some rings for the 550 from silvers.
The rings are slightly different if you look at them one is square and the other slightly tapered.
It tells you the installation sequence in the manual if you have one, the rings are marked with a "N" this needs to go to the top if I remember correctly.
Hope this helps.
Regards,
thanks,I looked Very Hard,and found the "N"s,as luck would have it,I had fitted them correctly, as far as the cause, check out this link, http://www.motorcycleclassics.com/mc-how-to/project-cafe-rebuilding-a-1973-honda-cb500.aspx#axzz2Vx8B1Md3a CB500/4 with almost the same issue, my piston wasn't quite as bad,but the diagnosis is "detonation" ,I guess severe "pinking" ?? my bike never seemed to suffer this,but would over advanced ignition cause it ? I run Boyer electronic and also a much bigger plug gap,(0.033th) as it supports a bigger spark, also gives great low/mid range punch, maybe I should retard the ignition a few degrees ?? thoughts and comments please, John
3164
« on: June 12, 2013, 12:01:46 AM »
ok,further update,
new parts arrived from Mr Silver,
nice new piston,and 4 sets of rings,
slight query,
the rings are 3pt oil,and two plain rings
one looks plain,no markings,seems to be coated in black teflon ??,guess its the second ring,
and I guess the one with grey surface for the bore is a chrome ring?? and is fitted at the top,
again no markings,
do you agree ??
regards
John
3165
« 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,
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