FD-67 Just about done

[Mark75H]

If you are going to speed test them, I'd recommend you do a 10 minute minimum run at speed

I've never heard anything about a mismatching problem with switching switch boxes on distributors and have had no problems that seem to relate to a mis-application. I don't know if that makes me brave or stupid. CDI only makes one replacement box for all the 4 & 6 boxes.

When the Merc boxes were new their low speed spark was impressive ... maybe SCARY is a better word. If you've had some with weak spark at any speed there was something wrong with them.

I use Merc triggers and CDI boxes on my 6's (all padded, one has 275psi cranking compression). They fire instantly and need little choking even on the chilliest days. This was not the case with old Merc boxes. I would not even trust a NOS Merc box ... they haven't been made in many years and could go bad just sitting on the shelf in my opinion.

I have a bunch of used Merc boxes that I would be happy to get $30 each for if anyone wants them.

The technical portion of this thread continues here: http://www.boatracingfacts.com/forum...ead.php?t=6242