Oh ok.. And the "new" loom, was second hand I suppose ? That makes it a bit of a wildcard.. Hmmm. Well I really think you should double check that the two looms are identical. As has been said, they could have different pin placements in the plugs, and they might even be differently wired. Different years and/or different markets can and often do use different wiring, and components, and sometimes at first glance they seem the same, colours perhaps, but not the pins, and sometimes the pins are in the same places, but connected to different wires.. Check the pin places and what colour they are connected to. Then, recheck the earth and power connections are good, wriggle wires where they go into the plugs/terminals feeling for broken copper.. Start with the ignition, earth and power wires that run the ignition system. Perhaps disconnect the kill wire from the cdi if that's possible, to eliminate switches or shorts inside the new loom.

GW and Mech's posts are critically important. Example: The aftermarket harness could have same wire colors, but, be wired differently. If you had spark prior to harness replacement, then the problem is most likely within the harness connections. Ya can't cheat it or assume anything. Trace your steps backwards. Use the manual for testing each component in the ignition system.

If this is aftermarket, I would double check that its wired like the old one, not all aftermarket is plug and play I found out recently.

And yeah.. Savage's right, that air gap is pretty critical. Apart from effecting the production of a spark, it also effects your timing and your timing advance..

There are also 1998 and 2002 manuals there if there isn't the one.

Rocky Mountainatvmc.com, and Motosports.com are the two places I use the most to find parts, they have everything.

Check any motorsports shop.