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by Gui.dorey
Wed Jan 30, 2019 5:58 am
Forum: Four stroke
Topic: Sq4 rocker arm
Replies: 6
Views: 395

Re: Sq4 rocker arm

On mine 4 rocker arms have a hole on top, just like Simes. The other 4 don't have any hole at all. I was also wondering about that.
by Gui.dorey
Fri Jan 25, 2019 11:39 am
Forum: Four stroke
Topic: Square four rebuild- next problem
Replies: 43
Views: 2403

Re: Square four rebuild- next problem

Hi Gui On my engine the the machined crank case mouth protrudes 1/8 In front of the cylinder block with a straight edge across the top of the rocker box a measurement can be made of the total height which should give you a good guide Pete Pete, I’m not sure if I understood you correctly, but mine s...
by Gui.dorey
Thu Jan 24, 2019 8:19 pm
Forum: Four stroke
Topic: Square four rebuild- next problem
Replies: 43
Views: 2403

Re: Square four rebuild- next problem

Thank you Pete,

The only thing I can confirm is the length of the push rods which are about the same. The other dimensions will help, but since my head is assembled at the moment I can't check the rest.
by Gui.dorey
Thu Jan 24, 2019 6:33 pm
Forum: Four stroke
Topic: Square four distributer drive
Replies: 1
Views: 212

Square four distributer drive

Hello everyone,

Next question.
Should the dynamo housing with the worm gear that drives the distributor be packed with grase? Or lubricated in any way?
Cheers
Gui
by Gui.dorey
Thu Jan 24, 2019 8:53 am
Forum: Four stroke
Topic: Square four rebuild- next problem
Replies: 43
Views: 2403

Re: Square four rebuild- next problem

The Sloper is 1930.
by Gui.dorey
Thu Jan 24, 2019 5:51 am
Forum: Four stroke
Topic: Square four rebuild- next problem
Replies: 43
Views: 2403

Re: Square four rebuild- next problem

John, That would be the proper way for sure, but I don't really have any way or the tools to measure exactly how much was take off. Anyway going with a max gap for late cams of 8 thou or about 0.2mm, and due to the fact that I have that on two or three valves already, what I'm missing can't be that ...
by Gui.dorey
Wed Jan 23, 2019 9:49 pm
Forum: Four stroke
Topic: Square four rebuild- next problem
Replies: 43
Views: 2403

Re: Square four rebuild- next problem

Hello again, First of all thank you all very much for the help and great suggestions in solving the problem. The help here in the forum is really invaluable to get these bikes back on the road. I will go with a base plate under the barrel. The advice from other friends with experience in restoring o...
by Gui.dorey
Wed Jan 23, 2019 9:55 am
Forum: Four stroke
Topic: Square four rebuild- next problem
Replies: 43
Views: 2403

Re: Square four rebuild- next problem

No, I’m still hoping for a solution to work with what I have I was thinking along the same lines as you, although using a metal shim is probably even better than just a thicker gasket on the barrel. The other possibility would be to use a second gasket, even if not an Otto, on the head. Or is this a...
by Gui.dorey
Tue Jan 22, 2019 11:06 pm
Forum: Four stroke
Topic: Square four rebuild- next problem
Replies: 43
Views: 2403

Re: Square four rebuild- next problem

Thanks as well Simes. That seems to confirm that my head is knackered. So, unless somebody has a head lying around that I could use, waht are the suggestions on how to solve this mess? The first thing I thought of was to make a thicker gasket for the base of the barrel, but not sure if there would b...
by Gui.dorey
Tue Jan 22, 2019 8:39 pm
Forum: Four stroke
Topic: Square four rebuild- next problem
Replies: 43
Views: 2403

Re: Square four rebuild- next problem

Hi Paul, Many thanks for the measurements. It furthers my suspicion that the former butcher, I mean owner, skimmed the head and/or barrel excessively. Let's see if Simes gets a similar figure as well. And no, I don't have any caps on the stems. BTW, I was able to trace a bit of history of my Square ...

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