This is the kit I got :
https://www.zumasrusstore.com/collec...erformance-kit
And it was $399 a few weeks ago when I bought it.
I also used a new Malossi 6117010 belt.
The plug I used was an NGK BRP8HS and it was a nice tan color with a #95 jet. I'm still missing something in the mid range powerband, I may go up to a #100 jet and see what happens. Gotta' get this other fuel system problem fixed first. Maybe I'll go with a manual petcock, those were invented for morons anyway, I've had bikes, ATVs, lawnmowers and snowblowers with manual fuel valves, it's no big hassle. But I'm not yet sure what type of bracket I'd have to fabricate to install one.
However, I would like to understand the stock vacuum valve a little better.
Is the fuel fed strictly via gravity, or does the diaphragm pulse with the vacuum signal creating a pumping action, pushing the gas downstream under pressure ???