Rough running, help!

[morgan]

I recently had a backfiring problem - chased everything out. In the end , in desperation, changed cap and arm - instant cure. Couldnt see anything wrong but it sorted it. So Worth a go for sure...

[Dom66]

I was super hopeful when I read this as I'd just taken delivery of new ones but, no bloody difference. A weak spark makes sense though, the plugs are fairly new but I'll pull them and see how they look, perhaps try and test leads and coil as well....

[Dom66]

So, just got back on this after having to actually work most of this week !

Popped the coil off, which is mounted horizontally. I gave it a shake and can hear liquid so presume it's the oil filled type, I always thought these should be mounted vertically ? Having said that, the primary circuit is reading 1.8 ohms and the secondary 11k, so it seems to be sound....

I'll give the mounting bracket a quick coat of paint while it's off and have a look at the plugs.

[RobTwin]

So, just got back on this after having to actually work most of this week !

Popped the coil off, which is mounted horizontally. I gave it a shake and can hear liquid so presume it's the oil filled type, I always thought these should be mounted vertically ? Having said that, the primary circuit is reading 1.8 ohms and the secondary 11k, so it seems to be sound....

I'll give the mounting bracket a quick coat of paint while it's off and have a look at the plugs.

Yes it must be gell-filled if you want to mount it horizontally

[Dom66]

OK, who wants a giggle....

So I start pulling the plugs, a little sooty, not very surprising, three of them wet with fuel, again not that surprising, I get round to the second to last one, number 6 and it's loose in the block All cleaned and back in I fire her up and she's idling almost normally....

I wouldn't mind, but No. 6 is one of the easier ones to get to with my headers. Ah well.

I checked the leads while I was at it, a couple of them had higher resistance than I'd expect for the length and one had the insulation burnt almost through, so a new set will be my next purchase.

[RobTwin]

Thanks, I did have a little giggle

Good that it was an easy fix, if a liittle embarrassing

[Dom66]

Just a bit In my defence, I didn't fit the plugs, and though they would normally be one of the first things to look at, I knew they had recently been replaced, so I didn't..... Lesson learn't.

On the plus side she's running noticeably better after the carb refresh, everything just seems a little sharper. Good to be back on the road

[morgan]

Nice when its something simple. I've chased my tail over less - enjoy it !

[Adam]

Pleased you found the main culprit Dom. Not to pee on your cornflakes, but if there are 3 other wet plugs, you may still have an electrical problem. Hopefully plug wires.

[Dom66]

Yeah, I'll re-check them once I've replaced the wires and run her round for a bit