Testing a Coil
Posted: Fri Sep 23, 2016 2:21 pm
Hi,
I'm trying to get to the bottom of the running problems I'm having with my twink - it seems as if it is not firing on all cylinders, there is definitely fuel and the twin 40 are pretty new and balanced, but it's a bit spluttery - much better an smoother at higher revs. to me it seems electrical, I've tested the spark on all plugs and had them all out to clean and check the gaps but still the same.
I thought the other day though that I used to have an old Sunbeam Stiletto which had similar symptoms and that ended up being the coil or the condenser - is there a way of testing a coil rather than just replacing? I know they aren't expensive items, but would be good if there was an easy test before I did.
Or any other suggestions? car is big valve, running electronic ignition but most other engine/electricals are standard. The engine was rebuilt about 500 miles ago by Spyder so will be going back to them to check, they mentioned something about it might be the timing chain (it had a new one) possibly relaxing and putting the timing out, but as the problem seems to suddenly disappear as they revs get higher I doubt it. It's almost as if one cylinder suddenly starts firing again and you get full smooth power rather than lumpy spluttery...
Cheers
Joe
I'm trying to get to the bottom of the running problems I'm having with my twink - it seems as if it is not firing on all cylinders, there is definitely fuel and the twin 40 are pretty new and balanced, but it's a bit spluttery - much better an smoother at higher revs. to me it seems electrical, I've tested the spark on all plugs and had them all out to clean and check the gaps but still the same.
I thought the other day though that I used to have an old Sunbeam Stiletto which had similar symptoms and that ended up being the coil or the condenser - is there a way of testing a coil rather than just replacing? I know they aren't expensive items, but would be good if there was an easy test before I did.
Or any other suggestions? car is big valve, running electronic ignition but most other engine/electricals are standard. The engine was rebuilt about 500 miles ago by Spyder so will be going back to them to check, they mentioned something about it might be the timing chain (it had a new one) possibly relaxing and putting the timing out, but as the problem seems to suddenly disappear as they revs get higher I doubt it. It's almost as if one cylinder suddenly starts firing again and you get full smooth power rather than lumpy spluttery...
Cheers
Joe