.045
that should have the HEI distributor so the plugs should be set at .045
.035 or you can go .045 depends on the engine setup but .045 is a safe gap.
The spark plug gap on a 2000 Kodiak 400 is .024
The correct spark plug for this motorcycle is: NGK D8EA
a 400 small block Chevy has a 4.125" bore.
it could be a bad spark plug wire or the plug could be gapped to much
The spark plug gap for a Yamaha Big Bear 400 should be set at .024 inches. A new spark plug may be purchased at an auto parts store with the gap preset.
.045
035
.060
.028
.028