Strange starting problem

[Stefnwolf]

Gas evaporation

Gas evaporation

Just for continuity.
Yesterday I drained the leftmost bowl, [lowest cos of sidestand], and got very little out.
Today pulled the carbs and drained all of them. Even less in there, I reckon about 2 coffe scoops at most. Seeing the size of the breathers / drain pipes or whatever they are, I think evaporation is not as unlikely as it seems at first.

Checked the petcock and it works just fine. Good flow on prime, and when on normal, a very little suck on the vacuum pipe provided identical flow.
Filter was very clean too.

 

[physics-teacher]

Strange starting problem update

Strange starting problem update

So far at least for my bike a weak battery seems to have been the problem. With a new battery installed, and after several days of sitting in miserable winter weather, the bike started right up. It looks like a weak spark could have been the culprit. The evaporated fuel issue cannot be totally dismissed, because the more energetic cranking may be pulling fresh fuel with the vacuum the way it was designed. Anyway, back on the road to work this morning in 36 degree weather. About 2 or 3 degrees for you Kiwis and Ozzies.

 

[open roader]

I recently started experimenting with running wife's gs750tz when it first starts with the choke only. With a clear road and second gear one can accelerate quite nicely using only the choke no throttle. The idea being the plugs are allways dry when it wont start cold with the chokes on,so I figure they are plugged and a good way of unplugging them would be increasing the pull through them. I'll report back. So far this thing is driving me nuts,not old triumph nuts but close