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by john.whiting
Fri May 31, 2019 2:45 am
Forum: Four stroke
Topic: strange cutting out incident
Replies: 8
Views: 349

Re: strange cutting out incident

if the engine turns over straight away ,i cant see a piston seizure.....usually thats a 10 minute wait for the bits to cool before its free enough to kick over........but a tight piston can cause a lot of drag without actually seizing....another thing to look at is valve clearance disappearing,and e...
by john.whiting
Fri May 31, 2019 2:28 am
Forum: Main Chat Forum
Topic: Returned from Australia
Replies: 35
Views: 1005

Re: Returned from Australia

getting a vehicle into Oz is a considerable undertaking...........every conceivable bit that might contain asbestos must be removed......includes the obvious......but also wiring,light bulbs,plastic panels,plastic components,rubber components, sound absorbing spray,all gaskets except metal shim ones...
by john.whiting
Thu May 30, 2019 12:47 pm
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 1776

Re: Shock absorber knocking

One simple thing to try is to fill the gap in the collets with silastic.....this does work ,and Ive done it in several engines...not S4 ,tho.
by john.whiting
Wed May 29, 2019 12:47 pm
Forum: Four stroke
Topic: So it begins
Replies: 56
Views: 2220

Re: So it begins

heres another thought.....if the mains are to slowly rotate in the case,as many seem to do,is there any point in lineboring?........in my experience ,these type of plainbearings close up by approximately 3/4 of the interference fit,and this is easily allowed for in machining them......So ,unless you...
by john.whiting
Wed May 29, 2019 12:39 pm
Forum: Four stroke
Topic: So it begins
Replies: 56
Views: 2220

Re: So it begins

Fixing a ally 4,you ll be on black tea and toast and jam for a year.,trying to pay for it.
by john.whiting
Wed May 29, 2019 12:34 pm
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 1776

Re: Shock absorber knocking

A modern stem seal is designed to spread a thin but even film of oil on the stem..........some here may remember the old hard rubber "umbrella" type seals in cars of the 60s and 70s.......in my Falcon,they caused galling and scoring of the exhaust stems,but removing them caused much smoke ...
by john.whiting
Wed May 29, 2019 6:40 am
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 1776

Re: Shock absorber knocking

GD,that is called fitting.....you dont just throw a british bike together and expect it to be right straight off.......you carefully check fits and clearances ,and free rotation.......but on a completely different subject.......I would not bother fitting exhaust stem seals to a cast iron 4,I did tha...
by john.whiting
Tue May 28, 2019 12:44 pm
Forum: Member's Bikes
Topic: My 1951 NH Red Hunter Project
Replies: 48
Views: 6488

Re: My 1951 NH Red Hunter Project

not necessarily ,,,the new chrome /less toxic salts produce a quite different result to the older hexavalent chromic acid process.
by john.whiting
Mon May 27, 2019 1:21 pm
Forum: A Bad thing happened to my Ariel
Topic: Primary chaincase disaster
Replies: 27
Views: 1817

Re: Primary chaincase disaster

if a pattern is to cost 500 quid,then I would have a case CNC machined from a solid lump of ally.....the upside being the holes would come as part of the job.....of course ,you would have to glue the old one back together,so it could be digitized..........its probably easier to take good care for yo...
by john.whiting
Mon May 27, 2019 7:19 am
Forum: Four stroke
Topic: VB Exhaust valve guide play
Replies: 13
Views: 692

Re: VB Exhaust valve guide play

Excessive guide wear is quite common in side valves,and doesnt seem to cause any problems.The guides do run very hot in a enclosed engine.

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