Dear fellow enthusiasts,
I created a new thread as the title of the old thread was bit outdated and not very informative.
For those of you reading my thread first time, it is a Square with 1937 4G engine in a 1948 tele/rigid frame. I did a total rebuild on the bike with new liners, new set of standard pistons (IMD), new valves and guides, old con rods, and rebuilt bottom end.
I did 150 miles (short 8 to 10 miles runs at one time). Then a week ago, I was taking the bike to my friend’s home for first re-torque. On my way, after about 8 miles, the engine stalled suddenly. I tried kicking it but it will not start. It started only with the bi-starter pulled halfway out. The engine was free with no smoke, fire, or undue noise. I hauled the bike to my friend’s home on a trailer.
I have some interesting updates from this weekend’s work.
Firstly (and apparently) the left-side rear spark plug connector was loose. It appears that cylinder was not firing all the time. At this point, it is just a guess based on oil found in that cylinder and a thick carbon build on the spark plug tip. The other 3 spark plugs appear healthy.
Secondly, the Solex float has a dent/depression where needle seats (You may remember my previous post that the carb starts leaking the moment you turn the petcocks on. The leak disappears once the engine is started and running). Could that probably mean the bike was running rich at idling (or even at low revs)?
Could that also be the cause of noticeable smoke (more so from the left side) when the bike is idling? I have already done about 150 miles so far. I am not sure if there is a cause for concern here.
I have requested David Jones to send me a new float. I should have it soon and will work on the carb next.
What I still do not understand is why the engine stalled on the road last week?
48' SQ4, 53' VB, 51' NH