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by Gui.dorey
Sun May 26, 2019 4:51 pm
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 10
Views: 389

Re: Shock absorber knocking

Hi Cam, Suggest you try to get in touch with Simon Holyfield. He did a lot of work and study on oil pressure, the relief valve and the oil lines to the rockers and pressure guage. simes is very helpful and I‘m sure he will be able to give great advice. He also put a lot of information on what he did...
by Gui.dorey
Thu May 23, 2019 4:14 pm
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 10
Views: 389

Re: Shock absorber knocking

Hi Cam, Exactly. Simes also documented that on his blog. My lines came from Drags as well, and the larger pipe feeds the rockers, just like yours. Should be the other way around. If you can solder pipe connections, it is quite simple to exchange the fittings one for the other. But, if you don't, the...
by Gui.dorey
Thu May 23, 2019 1:21 pm
Forum: Four stroke
Topic: So it begins
Replies: 33
Views: 973

Re: So it begins

Agree. Maybe they weren‘t so common in the 50‘s and that was the recommended solution back then. My rockers don‘t have it, but can‘t tell you if it‘s a problem or not - not enough mileage on her yet.
by Gui.dorey
Thu May 23, 2019 1:14 pm
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 10
Views: 389

Re: Shock absorber knocking

Yes, my plain bearing for the front crank seized due to my mistake in setting the end float. You can read the whole horror story here:

viewtopic.php?f=4&t=9348
by Gui.dorey
Thu May 23, 2019 10:29 am
Forum: Four stroke
Topic: So it begins
Replies: 33
Views: 973

Re: So the resurrection begins

Apparently this is done to help drain the oil away from the rocker assembly. I can only presume to stop oil potentially flooding the tappet area and maybe burning it. I am sure there are more knowledgeable members out there than I who know exactly why it's done. There is a recommended modification ...
by Gui.dorey
Thu May 23, 2019 10:18 am
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 10
Views: 389

Re: Shock absorber knocking

Cam, As a first thought - primary chain tension is checked and correct? Is the shock absorber tight enough? any chance that the big nut loosened? Then check the obvious - any bolt, nut or screw in the inner primary case come undone? I used an engine endoscope through the primary case inspection hole...
by Gui.dorey
Sun May 19, 2019 8:11 pm
Forum: Four stroke
Topic: Square Four MkI restoration complete - almost....
Replies: 67
Views: 1623

Re: Square Four MkI restoration complete - almost....

Hi everyone, Having some discussions outside of the forum, I now realize I did have some things wrong. The problem was I had some shims in the boxes of bits that came with the bike that don‘t belong to it. They have an outer diameter which is the same as the thrust washer, so basically they could ne...
by Gui.dorey
Thu May 16, 2019 10:35 pm
Forum: Four stroke
Topic: Square Four MkI restoration complete - almost....
Replies: 67
Views: 1623

Re: Square Four MkI restoration complete - almost....

The investigation went further and here are the results. Lack of oil: I rechecked all the the oil passages and they are clear. Used an oil hand pump and just pumped oil into the passage that feeds the rear bush and clear oil came straight out of the holes on the plain bearing. By covering one hole w...
by Gui.dorey
Thu May 16, 2019 6:03 am
Forum: Four stroke
Topic: Square Four MkI restoration complete - almost....
Replies: 67
Views: 1623

Re: Square Four MkI restoration complete - almost....

Hi Phil, Many thanks for the offer, that really very kind of you. I wouldn't know that shipping to other parts of Europe would be different to the UK, but you could always ask what are the charges to Germany. Just say it's an emergency air lift because the Russians are coming or something :) Anyway ...
by Gui.dorey
Wed May 15, 2019 10:12 pm
Forum: Four stroke
Topic: Square Four MkI restoration complete - almost....
Replies: 67
Views: 1623

Re: Square Four MkI restoration complete - almost....

Hi Chaps, So finally got to the bottom of it. Literally! The endoscope showed nothing broken and I had tears running down my eyes like a little 8 year old girl as I disassembled my engine all the way down to splitting the cases. Everything was free except the front crank which even after taking out ...

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