EricV
Husqvarna
AA Class
Hi gang. I posted this on the 610/630 forum but haven't had any input. Hoping someone is able to offer insight for what this might be, or peace of mind...kind of concerned here. Mine is a TE630 w/ around 8K on it now.
On Saturday I was out enjoying it all afternoon and stopped for a water break. When I went to start it I either didn't hold the starter button long enough or something else but, when it seemed to have caught to be fully fired up, it stalled immediately and did the "clank- clank" sound of what I assume is the auto-decomp. This is what I mean by false start...that's happened before (very rarely, on this and other bikes) and it shuts off w/ that kind of banging noise, if you know what I mean, but then fires right up as normal and no issues. So this time- when I did the re-start- it did fire right up and seemed to be running normal, but there was a rhythmic dull thunk noise every one second or so (not a sharp clank, but more of a dull metallic thump in the background of the usual engine noise.) It freaketh me out. So I of course shut it down after 30 seconds or so and then clicked it up to high gear and manually turned the engine over just a few revolutions by rolling the bike. I then fired it up again and no noise...bike ran fine the 45 minutes back home and for a short ride later that evening...no issues.
Now I know I should know more about the auto-decomp and the timing train, but don't know as much as I should. Any ideas on what transpired here...possible the timing jumped a tooth but still runs right? Would jumped timing have made that rhythmic noise anyway? Worried something has broken off in there, but now it's outta the way and running fine (which means threat of it grenading something later.) I know I should remove the valve cover but haven't the time for that this week, and want to run it on Tuesday.
As far as I do understand a "bad start" it's something along the lines of the piston coming up and just hitting the compression stroke, but not quite enough to complete the rotation so it's then followed by a backwards spin/clank. It also sounds as though the decomp is doing something in there. The thing that has me troubled, though, is what the rhythmic thunk was upon re-start. Again that's gone now, but worried.
Thanks gang- sorry for the long post.
On Saturday I was out enjoying it all afternoon and stopped for a water break. When I went to start it I either didn't hold the starter button long enough or something else but, when it seemed to have caught to be fully fired up, it stalled immediately and did the "clank- clank" sound of what I assume is the auto-decomp. This is what I mean by false start...that's happened before (very rarely, on this and other bikes) and it shuts off w/ that kind of banging noise, if you know what I mean, but then fires right up as normal and no issues. So this time- when I did the re-start- it did fire right up and seemed to be running normal, but there was a rhythmic dull thunk noise every one second or so (not a sharp clank, but more of a dull metallic thump in the background of the usual engine noise.) It freaketh me out. So I of course shut it down after 30 seconds or so and then clicked it up to high gear and manually turned the engine over just a few revolutions by rolling the bike. I then fired it up again and no noise...bike ran fine the 45 minutes back home and for a short ride later that evening...no issues.
Now I know I should know more about the auto-decomp and the timing train, but don't know as much as I should. Any ideas on what transpired here...possible the timing jumped a tooth but still runs right? Would jumped timing have made that rhythmic noise anyway? Worried something has broken off in there, but now it's outta the way and running fine (which means threat of it grenading something later.) I know I should remove the valve cover but haven't the time for that this week, and want to run it on Tuesday.
As far as I do understand a "bad start" it's something along the lines of the piston coming up and just hitting the compression stroke, but not quite enough to complete the rotation so it's then followed by a backwards spin/clank. It also sounds as though the decomp is doing something in there. The thing that has me troubled, though, is what the rhythmic thunk was upon re-start. Again that's gone now, but worried.
Thanks gang- sorry for the long post.