Okay--! I think I might have it.
My Tomos uses NGKbp4hs plugs. The coresponding NGK is a BPR4hs
Like you all suggested, these plugs are designed to produce less interference/noise than the standard plugs...
2.19 a pop. I'd like to find a Bosch Platinum with the same feature, as I've heard the worst about NGK (jap) in a Euro bike.
Thanks again. Stuck at work now, but I'll try it out after I get out. If this works, it will be grand, because I can use an MP3 player instead of the cassette deck, and will lose weight and get better sound.
I'll keep ya updated-- thansk again!!
(where did the dude with the 1000w amp go? I'd like to get more info!! Sweet amp, for sure...wondering how you power it...!)