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by Gui.dorey
Mon Jun 17, 2019 4:18 pm
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 6092

Re: Shock absorber knocking

simon.holyfield wrote:
30 psi when idling hot?


Yes, idling hot. But I‘m still fiddling with the idle set up and my idle is probably still a bit high. Will have to do a few more runs until I can say for sure where I‘m at. It was just a first run and not very long.
by Gui.dorey
Sun Jun 16, 2019 6:11 pm
Forum: Four stroke
Topic: Square Four MkI restoration complete - almost....
Replies: 72
Views: 7802

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

Hi chaps, To close up this story, I got the new plain bearing from Drags, and had it lined bored together with a mate. In the end it wasn‘t so difficult. It‘s more the setting up the milling machine than anything else. A few late nights putting the engine back together, and this time making sure the...
by Gui.dorey
Sun Jun 16, 2019 5:58 pm
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 6092

Re: Shock absorber knocking

Hi Cam, Got mine back up running again today. On the first start in the garage I also was getting >100 psi oil pressure cold. After a while it had dropped down to below 50psi. After the first run of just about 7km the pressure was settling down to 30. Like everyone says, they probably just need to r...
by Gui.dorey
Sat Jun 08, 2019 2:27 pm
Forum: Four stroke
Topic: So it begins
Replies: 63
Views: 19846

Re: So it begins

Thanks for your info John, will pass that on I am sure the bloke who is doing the job will / should know this. Just to confirm though, are you saying that the white metal bearing is not really necessary and that a plain bronze bush would suffice? I think what John is saying is to make a bronze bush...
by Gui.dorey
Wed Jun 05, 2019 6:29 am
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 6092

Re: Shock absorber knocking

Hello Cam, Can you take a picture of the plugs? If a cylinder is burning oil one should be able to see it on the plug. You probably checked, but are you sure all plugs are firing all the time? Although there were no apparent signs on mine, when I disassembled my engine I saw that Nr 2 hadn't been fi...
by Gui.dorey
Wed May 29, 2019 10:28 am
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 6092

Re: Shock absorber knocking

Hi Cam, you could always try this - again from the Sq 4 Workshop manual. No idea if works. However, I still find it hard to believe that so much oil is flowing down the stems on a newly rebuilt engine. On mine, which was just rebuilt as well, and using a Morgo pump, I just had some leakage at the ro...
by Gui.dorey
Wed May 29, 2019 5:52 am
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 6092

Re: Shock absorber knocking

Changing to Mk II guides might be an answer (if they fit - I didn't do this and don't know the respective dimensions). Alternatively, getting new guides turned-up with a top that allows the rubber 'valve guide seals' that one gets in car engines to be fitted would be a better option. MKII guides do...
by Gui.dorey
Mon May 27, 2019 5:45 pm
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 6092

Re: Shock absorber knocking

But... where is the oil coming from? There shouldn‘t be any oil getting into the combustion chamber. Even if there‘s a lot of it in the rocker boxes. I never had that problem the few times mine ran, and I also had the thicker oil line running to the rockers. Are you sure it‘s really oiling up and no...
by Gui.dorey
Sun May 26, 2019 4:51 pm
Forum: Four stroke
Topic: Shock absorber knocking
Replies: 56
Views: 6092

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: 56
Views: 6092

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...

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