No, no need to Insulate it, it needs to be grounded.

Where did the new ignition come from? (as in what mower)

Where do you have the points timed to?

Perhaps if you could pop up a picture of how you have it set up we could be a little more helpfull, often helps to see what's going on to get on the same page.


Cheers
Ty

____________________________
Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.