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by malcolm.johnson
Sun Sep 29, 2019 9:01 pm
Forum: Four stroke
Topic: Nh 350
Replies: 15
Views: 656

Re: Nh 350

To disconnect the capacitor on some models does require the armature to be dismantled. This is easy enough if you have the proper pullers to remove bearing inners etc. Pictures of my Square 4 "codesectomy". 20. Sq4 Full condensectomy (2).JPG 20. Sq4 Full condensectomy (3).JPG 20. Sq4 Full ...
by malcolm.johnson
Sun Sep 29, 2019 8:45 pm
Forum: Main Chat Forum
Topic: degreaser
Replies: 12
Views: 495

Re: degreaser

When I was an apprentice mechanic in the 1960`s we had a big paraffin bath that all the workshop lads shared and each mechanic also had his own tin of "trike" (trichloroethlene ?) Brilliant for cleaning anything especially carburettor exteriors, the smell still lingers with me, but I belie...
by malcolm.johnson
Sat Sep 28, 2019 11:23 am
Forum: Four stroke
Topic: Nh 350
Replies: 15
Views: 656

Re: Nh 350

I have used Brightspark capacitors 3 times now and all have worked great. The best result was by replacing the one in my 1947 iron 4G, which had a totally rebuilt and restored magneto/dynamo (that was unused albeit done a few years ago), but could not go further than 10 miles without bad misfiring p...
by malcolm.johnson
Thu Aug 15, 2019 11:39 am
Forum: Four stroke
Topic: Valve stem oil seals
Replies: 7
Views: 967

Re: Valve stem oil seals

Valve springs - fitting.JPG Valve guides fitted.JPG When I rebuilt my 1947 iron 4G in 2012 I made my own guides and machined them to suit seals as pictured (early Land Rover I think). I only fitted them to the inlets. I do not ride the bike much but they have covered several hundred miles and it do...
by malcolm.johnson
Thu Aug 08, 2019 8:41 pm
Forum: Four stroke
Topic: spanner or socket
Replies: 10
Views: 1496

Re: spanner or socket

Here is mine. I needed a spanner in a hurry so used some 1/4 plate I had. Centre punch, dividers, drills and a file. A good hours work and only ever used it once!
by malcolm.johnson
Thu Jun 13, 2019 9:38 pm
Forum: Four stroke
Topic: Aftermarket alloy singles barrel and piston.
Replies: 14
Views: 1055

Re: Aftermarket alloy singles barrel and piston.

I understand that no head gasket is used with the alloy head and barrel set up and are just lapped in together save the pushrod tube seals. What torque setting should I use for the 4 waisted studs/nuts for this aftermarket barrel and alloy NH head?
by malcolm.johnson
Wed Jun 12, 2019 11:26 am
Forum: Four stroke
Topic: Aftermarket alloy singles barrel and piston.
Replies: 14
Views: 1055

Re: Aftermarket alloy singles barrel and piston.

Thanks Simon, very useful info. It seems from that information, that the proper alloy head and barrel uses 5 studs/nuts, whereas my aftermarket barrel must be solely intended for use with the alloy NH head, which as you know, uses 4 bolts. At least I now know how to proceed with the top end. Thanks ...
by malcolm.johnson
Fri Jun 07, 2019 12:29 am
Forum: Four stroke
Topic: Aftermarket alloy singles barrel and piston.
Replies: 14
Views: 1055

Re: Aftermarket alloy singles barrel and piston.

Simon, I have found that using a conventional length stud would not allow the removal of the cylinder head with the engine in the frame. I am sure if my measurements are correct, l will need a shorter stud and sleeve nuts, to enable the head to be lifted clear without fouling the inlet valve cap on ...
by malcolm.johnson
Wed Jun 05, 2019 5:47 pm
Forum: Four stroke
Topic: Aftermarket alloy singles barrel and piston.
Replies: 14
Views: 1055

Re: Aftermarket alloy singles barrel and piston.

Thanks for the picture Simon. I could make some similar studs long enough to take a standard steel nut and also machine some sturdy washers to go under to spread the load? I meant to add that the only ID on the piston, is stamped small on the crown, is 434C7V. There are no cast in marks on the insid...
by malcolm.johnson
Wed Jun 05, 2019 11:47 am
Forum: Four stroke
Topic: Aftermarket alloy singles barrel and piston.
Replies: 14
Views: 1055

Re: Aftermarket alloy singles barrel and piston.

Thankyou for the replies. I am building this bike as a "green laner" or long distance trials, so I anticipate longer runs. The oil pump I have is 1/4 inch dia for delivery side and 3/8 inch for scavenge, so hope this will do for starters. The alloy head has 3/8 inch holes right through. Fo...

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