No yamahas with rear suspension! I guess you haven't seen my Pro Tec 175 rear suspension kit project yet then. Several friends and myself have the Pro Tec kits to add a rear swingarm to a yt175! Look for the thread on here about this and see what we are up to!
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90