I'm runnin a port and polished china girl 80, with a fred head and kx80 expansion chamber exhaust with ( I think, its been awhile) 36T sprocket. She's been runnin the stock NT with the choke half open, and I was thinking she could handle about an 18mm instead of the stock 14mm. Anywho, I just scored a fantastic deal on a complete and operational mikuni 20, and am hopeful it will work. If it dont, I will resell it, but I would like to hear your thoughts on whether you think it will work or not. Thanks.