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by Gui.dorey
Tue Sep 03, 2019 3:38 pm
Forum: Four stroke
Topic: Sq4 MKI timing case breather
Replies: 10
Views: 3183

Re: Sq4 MKI timing case breather

It’s definitely larger than 1/4”. I don’t think I can get a caliper in there, though. I believe it’s 3/8” but I wanted to be sure before trying to disassemble it.
by Gui.dorey
Mon Sep 02, 2019 6:04 am
Forum: Four stroke
Topic: Sq4 MKI timing case breather
Replies: 10
Views: 3183

Re: Sq4 MKI timing case breather

The banjo bolt I have. It’s the fitting and pipe I need replacing, and that they don’t have. But should be a standard fitting, thar’s why I wanted to know the exact dimension.
by Gui.dorey
Sun Sep 01, 2019 5:47 pm
Forum: Four stroke
Topic: Sq4 MKI timing case breather
Replies: 10
Views: 3183

Sq4 MKI timing case breather

Hello everyone,

Does anybody know the size of the banjo bolt used at the back of the timing case as a breather? is it a 3/8"?
I need to find a new banjo fitting for it.

Thanks in advance,
Gui
by Gui.dorey
Sun Sep 01, 2019 12:33 pm
Forum: Four stroke
Topic: Square Four MkI - first rides after restoration
Replies: 31
Views: 6588

Re: Square Four MkI - first rides after restoration

Well, to wrap up this thread I can now say the restoration is complete. Sorted out a few things, got the speedo working properly again, swapped the oil lines to the rockers and pressure gauge, did the first oil change and readjusted the valves after the first 100kms, and today drove to a classic bik...
by Gui.dorey
Sun Sep 01, 2019 12:21 pm
Forum: Four stroke
Topic: New VB piston
Replies: 17
Views: 2044

Re: New VB piston

John, to be honest I have no idea where the piston came from. It does match the original in that it only has two compression rings and no oil ring. The pin is 19mm so a bit smaller than the 55/64” you mentioned. The bore was originally 80mm.
by Gui.dorey
Sun Sep 01, 2019 7:25 am
Forum: Four stroke
Topic: New VB piston
Replies: 17
Views: 2044

Re: New VB piston

Gidday Gui, I am surprised that you are getting the rebore before the piston - isn't it usual to bore the cylinder to get the correct fit for the piston ? Cheers, Bevan p.s. real shame you haven't been able to identify an existing replacement piston. I've turned the oil control valve up on my Slope...
by Gui.dorey
Fri Aug 30, 2019 2:24 pm
Forum: Four stroke
Topic: sq4 camshaft removal
Replies: 3
Views: 972

Re: sq4 camshaft removal

You know it's a left hand thread, don't you?
You can try using the timing chain to lock it, with a screwdriver shaft or similar through the links.
by Gui.dorey
Fri Aug 30, 2019 10:47 am
Forum: Four stroke
Topic: New VB piston
Replies: 17
Views: 2044

Re: New VB piston

It still ran?? Wow Oh they run. Sometimes it is amazing how. This year my 1930 BSA Sloper just had a complete brake down - it just died in the middle of a tour and wouldn’t start anymore. When I measured compression later the gauge showed 0! I thought the gauge was broken. When I opened the engine ...
by Gui.dorey
Mon Jul 01, 2019 6:14 pm
Forum: Four stroke
Topic: Balance pipes
Replies: 5
Views: 618

Re: Balance pipes

On mine they also look like the left one.
by Gui.dorey
Sun Jun 30, 2019 10:38 pm
Forum: Four stroke
Topic: Square Four MkI - first rides after restoration
Replies: 31
Views: 6588

Re: Square Four MkI - first rides after restoration

simon.holyfield wrote:You marked the front crank nut?


Oh, yes, forgot that bit. Used the front crank nut for the markings. It's amazing how much oil splatters out when one throttles up :shock:

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