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by Gui.dorey
Fri Sep 27, 2019 5:59 am
Forum: Four stroke
Topic: Nh 350
Replies: 15
Views: 611

Re: Nh 350

Thanks Chris have you had or anyone else had dealings with brightspark, ,I'm looking to get my mag reconed any recommendations would be greatly appreciated I had a magneto for my BSA Sloper done by Brightspark. It didn’t require much - a good clean and replacing the original condenser with one of t...
by Gui.dorey
Wed Sep 25, 2019 12:43 pm
Forum: Four stroke
Topic: Square 4 MkI - too lean or too retarded?
Replies: 12
Views: 617

Re: Square 4 MkI - too lean or too retarded?

Thanks for the links to the articles on reading spark plugs. Very interesting.
After reading them and examining my plugs again, I would say the mixture ist too rich and the timing could be more advanced.
Some more testing required…
Cheers
by Gui.dorey
Tue Sep 17, 2019 8:58 pm
Forum: Four stroke
Topic: Square 4 MkI - too lean or too retarded?
Replies: 12
Views: 617

Re: Square 4 MkI - too lean or too retarded?

simon.holyfield wrote:I'd check the ignition settings. I use B6HS and they are much darker than that.


Also leaning that way. I have no washers under the float, so can't go any richer there.

Just to be sure with the ignition timing - Does it seem to be retarded by looking at my plugs?
by Gui.dorey
Tue Sep 17, 2019 5:53 pm
Forum: Four stroke
Topic: Square 4 MkI - too lean or too retarded?
Replies: 12
Views: 617

Square 4 MkI - too lean or too retarded?

Hello chaps, After the first 200 miles this is what my plugs look like. I’m holding 1 and 2 in my hand, 3 and 4 look similar. The plugs are NGK B6HS. It looks too lean to me, but what’s your opinion? Since the jets are fixed, could it be that the ignition is too retarded? Or the plugs too hot? If th...
by Gui.dorey
Mon Sep 16, 2019 8:08 am
Forum: Electrics
Topic: Sq Four MkI and Thorspark Ignition
Replies: 0
Views: 399

Sq Four MkI and Thorspark Ignition

Hello Everyone, I installed a Thorspark Ignition on my Sq 4 and was very happy with it. Easy starting, ran great. A few days ago the engine just died while in top gear, all lights out, all electrics dead. Fortunately I was just about to turn into the street where I live so I didn’t have to push her ...
by Gui.dorey
Mon Sep 09, 2019 8:30 pm
Forum: Four stroke
Topic: Square Four MkI - first rides after restoration
Replies: 31
Views: 5592

Re: Square Four MkI - first rides after restoration

Hello Gui, thats a very nice Mk1. Congratulations. When I looked at the photos of your outing, it seems that the 2 front mudguard stays are too long compared with the red Mk1. Too long stays result in an uptilting mudguard. There are 2 different lenghs, the one for the valanced guard and the other ...
by Gui.dorey
Mon Sep 09, 2019 8:23 pm
Forum: Four stroke
Topic: Square Four MkI - first rides after restoration
Replies: 31
Views: 5592

Re: Square Four MkI - first rides after restoration

If there's still any lack of higher speed smoothness or power it might be worth making sure the fuel can get through properly - they tend to like a full tank - and the breather must work of course. I guess you'll have checked engine mountings are tight too? Eggs, grandmothers etc. That’s all sorted...
by Gui.dorey
Sun Sep 08, 2019 7:55 pm
Forum: Member's Bikes
Topic: SpAriel MkII aka The Hermanator
Replies: 110
Views: 20164

Re: SpAriel MkII aka The Hermanator

Vincent, that looks like the clamp for the exhaust header that holds it to a lug on the frame. There should be two - left and right and they are on the bottom frame tubes towards the front. The two bolts look like the ones for the rear mudguard. The one for the left side is where the rear stand spri...
by Gui.dorey
Sun Sep 08, 2019 4:00 pm
Forum: Member's Bikes
Topic: 1952 Square Four MkI
Replies: 5
Views: 2830

1952 Square Four MkI

Finally finished after 2 1/2 years rebuilding her from a basket case.
by Gui.dorey
Tue Sep 03, 2019 9:20 pm
Forum: Four stroke
Topic: Sq4 MKI timing case breather
Replies: 10
Views: 2744

Re: Sq4 MKI timing case breather

Bob and Simes, Thanks. That sounds about right. I used an 8mm pipe to fit inside the banjo bolt inside the timing case when I did the mod to get the breather opening towards the area of the cam sprocket. 8mm is about 0.32” which matches the pipe bob measured. So I should get a banjo union for a 1/4”...

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