The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: baz on 30.06. 2012 13:38

Title: melting HT lead
Post by: baz on 30.06. 2012 13:38
out today on my super rocket spec A10 and i had a misfire eventualy cutting out on one cylinder,when i got home i realised the HT leads had melted through! i run my leads in between the inlet manifold and this is where they had melted has anyone else had this? the engine was running fine so i'm not sure if it was overheating or crap Ht leads,maybe i should re rout the leads?,,,,,,,,,,,,baz
Title: Re: melting HT lead
Post by: iansoady on 30.06. 2012 15:18
I try to keep mine as far from hot bits as possible - easy with the one off the back of the mag but harder with the other....

ISTR original photos of A10s with the leads as you describe (does look tidy) but I wouldn't route them like that.
Title: Re: melting HT lead
Post by: baz on 30.06. 2012 15:57
i have always routed them like that in the past but now i have routed them away from the head and covered them in heat shrink ,,,,,,,,baz
Title: Re: melting HT lead
Post by: BSA_54A10 on 01.07. 2012 10:29
Quote
i have always routed them like that in the past but now i have routed them away from the head and covered them in heat shrink

I hope you mean spagetti tube and not heat shrink.
The first is the woven tube like you see over the wires inside the maggy it is thermally insulating.
Heat shrink is not and will melt just like the original wire did.
Title: Re: melting HT lead
Post by: baz on 01.07. 2012 22:26
dam i thought that heat shrink was more heat resisting than the HT as i normaly shrink it with a flame from a gas lighter,as i have now routed the leads away from the head it should be ok now ive done about 50 miles since and its running fine cheers baz
Title: Re: melting HT lead
Post by: wilko on 02.07. 2012 01:27
Asbestos sleeving is the go.