Hard to start 912 ULS
in 912 / 914 Technical Questions
10 years ago
My 912 ULS has suddenly started getting very hard to start. From cold (ambient temperature is about 30 degrees) it turns a bunch of times then "bang bang" kicks a bit but doesn't start. After trying this a few times, it finally gets going and then is as smooth as ever. I just did a carb sync and idle screw adjustment thinking that might be the problem but that has not helped.
I pulled a spark plug from each cylinder to check. They all look the same - see below. I think this is ok, they have a slight brown color to them. But I welcome others' views.
The starting is quite violent and it actually shook hard enough to damage the rubber coolant expansion tank protector so I'm leery of guessing at things. I'd really like to get to the suspected root cause and try to fix it before I try starting the engine again.
FYI, I recently replaced the oil with the usual Mobil 1 V-Twin synthetic that I've been recommended to use. I didn't notice the problem immediately afterwards so I'm not sure what caused it.
I'd appreciate any guidance. Thanks.
I pulled a spark plug from each cylinder to check. They all look the same - see below. I think this is ok, they have a slight brown color to them. But I welcome others' views.
The starting is quite violent and it actually shook hard enough to damage the rubber coolant expansion tank protector so I'm leery of guessing at things. I'd really like to get to the suspected root cause and try to fix it before I try starting the engine again.
FYI, I recently replaced the oil with the usual Mobil 1 V-Twin synthetic that I've been recommended to use. I didn't notice the problem immediately afterwards so I'm not sure what caused it.
I'd appreciate any guidance. Thanks.
image.jpeg (You do not have access to download this file.)
