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by john.whiting
Sat Aug 08, 2020 6:43 am
Forum: Four stroke
Topic: VH crankcase joint
Replies: 9
Views: 342

Re: VH crankcase joint

A lot of work /expense for very little benefit......if there is enough of the original register to locate the castings ,then that is sufficient...........Similar to the crankcases.......the barrel recess bore and remains of the ledge are quite sufficient to locate the cases,and once properly tighten...
by john.whiting
Fri Aug 07, 2020 10:46 am
Forum: Four stroke
Topic: Mk1 Sq 4 BLOWING HEAD GASKET
Replies: 16
Views: 376

Re: Mk1 Sq 4 BLOWING HEAD GASKET

Another factor is ignition advance .....even slightly over advanced timing can increase cylinder pressure by hundred or more PSI.....and cause rough running and noise without any increase in power........beyond a certain point cylinder pressures rise with a corresponding reduction in power......the ...
by john.whiting
Fri Aug 07, 2020 10:46 am
Forum: Four stroke
Topic: Mk1 Sq 4 BLOWING HEAD GASKET
Replies: 16
Views: 376

Re: Mk1 Sq 4 BLOWING HEAD GASKET

delete/delete.
by john.whiting
Wed Aug 05, 2020 11:56 am
Forum: Main Chat Forum
Topic: Vibro-tech Parts Washing Fluid
Replies: 3
Views: 204

Re: Vibro-tech Parts Washing Fluid

You are entitled ,by law ,to be given a copy of the MSDS of any material you buy containing chemicals......They are usually online ,too ,and you can find out what chemicals are in it.
by john.whiting
Thu Jul 30, 2020 2:31 pm
Forum: Four stroke
Topic: Sleeving and piston fit for a VB
Replies: 15
Views: 1039

Re: Sleeving and piston fit for a VB

Some SV motors came sleeved from the factory...a well known example is the BSA M21,where a special HD model had a sleeved bore for commercial use,such as the AA or Police.All the industrial JAPs I ve got are sleeved from the factory,including a 500 that was NOS from GEC Diesels.If you keep the fins ...
by john.whiting
Mon Jul 27, 2020 2:12 pm
Forum: Four stroke
Topic: Mofified VH Head
Replies: 12
Views: 493

Re: Mofified VH Head

Inserting a valve seat in a CI head is not a problem......what is often a problem is the lower edge of the insert may not match the port shape ,unless the port is quite long ,which motor bike s arent....One time seats in CI heads were welded up to rebuild them ,the famous old firm of Barimar used to...
by john.whiting
Mon Jul 27, 2020 3:36 am
Forum: Four stroke
Topic: Iron 4G Crankshaft Nuts
Replies: 5
Views: 234

Re: Iron 4G Crankshaft Nuts

Gear blocking wedges are made of tough plastic and good for the 1200 ft lb of a typical drive flange....Hard steel may raise a burr on teeth ,causing noisy operation.
by john.whiting
Mon Jul 27, 2020 3:32 am
Forum: Main Chat Forum
Topic: Rust Prevention.
Replies: 12
Views: 672

Re: Rust Prevention.

By the way,the WD means water dispersant ,which is what the silicone spray is,and is no way a long term preservative .If you want something really cheap ,used truck diff oil mixed with a bit of petrol is effective for some years at least......the oil must be full of wear particles ,fresh oil isnt ef...
by john.whiting
Mon Jul 27, 2020 3:26 am
Forum: Main Chat Forum
Topic: Rust Prevention.
Replies: 12
Views: 672

Re: Rust Prevention.

Air flow and circulation is what causes rust.....if you can seal off the metal from atmospheric circulation ,it wont rust.....this is bit counterintuitive ,as many assume airflow will carry away any moisture.....One thing Ive found really effective against rust is old fashioned red oxide paint ........
by john.whiting
Thu Jul 23, 2020 12:43 am
Forum: Four stroke
Topic: loose crankshaft coupling remidies required
Replies: 16
Views: 697

Re: loose crankshaft coupling remidies required

A common cause of gear noise in engines is excessive ignition advance.....increased cyclic irregularity is the reason.

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