hi ive got blue magnecor ht leads and they keep poppin off the dizzy cap!
... do u need a special dizzy cap for magnecor leads or has the previous owner possibly fitted the wrong leads??

 

I had a same problem with motorsport leads they should with a strong push stay on?

 

also mate if you have used silicone under your bonnet to clean it they may slip off take the leads off one at a time (so they stay in order) and clean the dizzy cap and then like noisey boy says give them a bit of a push

 

mine did pop off a couple ov time sn i woz runnin on 3 cylinders! how embarrasing! yeh u realy have to push them on hard, they sorta like click on, if u dont feel em click on they ent on properly.

 

Had the very same problem with the ford motorsport ones...load of shite them! No matter what i did they wouldn't stay on, they'd normally fall off when i was racin someone and i hit the limiter, leavin me on 3 cylinders