Bogging down/ rough running problem
Posted: 21 Aug 2022 08:53
Hi All- I have searched the forum to try to avoid writing this post but cant quite find anything covering it but if there is please send me there....
The problem is that despite easy starting and bike ticking over OK ~(ish) when I open the throttle beyond the first 5th or so, especially quickly, it bogs down/runs rough. Up hill it is worse. If I back off in most circumstances it improves and in fact it will increase in revs. The symptoms are quite extreme and it is hard to pull away smoothly from lights and overtaking is not possible.
I have tried adjusting mixture screws and lowered needles and now gothic back in teh middle setting. Nothing seems to make much difference. The air filters are currently out as another try- rubbers and box still attached. Spark plugs look sooty but only checked once stopped- I've not cut engine at speed and checked.
Q: Does this sound like a carb issue? (over rich mixture perhaps) or an ignition issue? (timing too advanced/too retarded) I also wonder if tight valve gaps might cause this. I did adjust and thought they were correct but maybe they are tight. I will be checking them again today (Sunday 21-8-22)
I realise there are many possible causes but if you have ideas of most common causes please let me know.
Many thanks in advance
Matt
The problem is that despite easy starting and bike ticking over OK ~(ish) when I open the throttle beyond the first 5th or so, especially quickly, it bogs down/runs rough. Up hill it is worse. If I back off in most circumstances it improves and in fact it will increase in revs. The symptoms are quite extreme and it is hard to pull away smoothly from lights and overtaking is not possible.
I have tried adjusting mixture screws and lowered needles and now gothic back in teh middle setting. Nothing seems to make much difference. The air filters are currently out as another try- rubbers and box still attached. Spark plugs look sooty but only checked once stopped- I've not cut engine at speed and checked.
Q: Does this sound like a carb issue? (over rich mixture perhaps) or an ignition issue? (timing too advanced/too retarded) I also wonder if tight valve gaps might cause this. I did adjust and thought they were correct but maybe they are tight. I will be checking them again today (Sunday 21-8-22)
I realise there are many possible causes but if you have ideas of most common causes please let me know.
Many thanks in advance
Matt