This weekend had some progress. I timed the ignition with a strobe light and indeed it was a few degrees retarded... What marks did you shine the strobe at Gui? I did a mark at TDC for retarded at idling and one at 8mm BTDC or about 5/16“. It started advancing at about 1300-1400 rpms if I remember ...

chris.shearwood wrote:

Gui.dorey wrote:Now, I'll have to tackle the oil leaks which still are way too much, especially from the drive side.

What is the oil level in your primary case?

Filled it up to the level plug. According to other members here it is probably too much.

This weekend had some progress. I timed the ignition with a strobe light and indeed it was a few degrees retarded. However, I noticed the advance didn't seem to be working properly, and this was confirmed by a trial run. So back to the distributor and the advance mechanism. The weights seemed to hav...

Thanks for the article on the speedo Simes. I had it already and that is what I used. I'll have to open it up again and see if I can find out what is wrong. Maybe I missed something. Regarding the oil lines, I still have them backwards, with the larger going into the rockers. I haven't changed it ye...

This weekend I did a few more rides. I am now happy with my idle settings and can now close the bi starter all the way. Cold start procedure is to open the bi starter all the way, kick 2-3 times with ign off and throttle closed, bi starter in the mid position, ign on and she starts on the 1st or 2nd...

Hi Simes, I recall reading through a thread here some time ago, that someone had analyzed the Otto gasket and came to the conclusion it was reusable. I'm not sure what the topic was or when it was posted, but likely a search will bring it up. It was thread where someone dissected a gasket to see how...

How much oil did you have in there Gui? Just filled it up to the level plug. Should be correct, right? Last evening I checked the torque on the head bolts. None needed retightening, but another question arised. Should I ease all the nuts and then re-torque, or is it fine to just check the torque an...

Hi Gui I bought and fitted aluminium thrower discs (purchased from Peter Kemp), which have proved effective That sounds like a good idea. However, it makes you wonder how did they work as new - did the customers of a brand new and expensive Sq4 just accept that the primary case oil spilled out? if ...

Thanks Phil, The head bolts at the front under the oil line as well as the four inside the rocker boxes, I can get to. The trouble are the 2 at the back under the manifold. And unfortunately, on the MkI the manifold cannot be removed. Its part of the whole head casting.... I also have a short wire s...

Hi Chaps, Decided to start a new thread after the woes with engine, and having rebuilt it for a second time, to report on the first experiences running the Square Four in. Today I went for a longer run to get get the engine up to normal running temperature, set my idle, set the air screw on the carb...