Difficulty starting ST90
Posted: Mon Feb 08, 2016 4:06 pm
Righto guys, I've got an '82 ST90 running the standard F8a and 4sp, the thing has always started first turn since adjusting the valve clearances, timing, new plugs etc and runs like a dream
Recently the starter was playing up and as it turns out it was just the connection to the solenoid - easily rectified and now it's cranking just as it has been this whole time. Since then however it really struggles to start, push starts fine and also after some persuasion will start off the starter but it's really killing me. I've checked spark and regapped the points, then proceeded to get the timing gun onto it and reset the timing... The engine runs perfectly (when it's running) but just won't start. Also it has taken to occasionally running on... From what I've read this could be a build up of carbon deposits in the combustion chamber? It does seem to be running quite rich (mixture screw on the carb is all the way in)
My current train of thought is to do a compression test, as if any valves are too tight this would lead to inadequate sealing of the combustion chamber and without compression there is no bang, and hence it won't start (although it's running the best it ever has and comfortably sits on 100, as it did this morning)
If there are any gurus out there who know some gypsy magic to get this thing back on track that'd be great!
Cheers, Elton
Recently the starter was playing up and as it turns out it was just the connection to the solenoid - easily rectified and now it's cranking just as it has been this whole time. Since then however it really struggles to start, push starts fine and also after some persuasion will start off the starter but it's really killing me. I've checked spark and regapped the points, then proceeded to get the timing gun onto it and reset the timing... The engine runs perfectly (when it's running) but just won't start. Also it has taken to occasionally running on... From what I've read this could be a build up of carbon deposits in the combustion chamber? It does seem to be running quite rich (mixture screw on the carb is all the way in)
My current train of thought is to do a compression test, as if any valves are too tight this would lead to inadequate sealing of the combustion chamber and without compression there is no bang, and hence it won't start (although it's running the best it ever has and comfortably sits on 100, as it did this morning)
If there are any gurus out there who know some gypsy magic to get this thing back on track that'd be great!
Cheers, Elton