If it blubbers or runs rough after those changes, put the carb back in its stock form and live with it. Let me know how it goes. The DT175 is a standard dirtbike. It uses the standard Yamaha mono-shock configuration prevalent in the late 1970's. The AG200 is pretty much the same.
Maintenance is higher for the rising-rate because there are more bearings to grease.
The triangulated swingarm on the mono-shock is also cheaper to build. To get the same stiffness on swingarms without the extra tubes requires the manufacturer to use large cross-section aluminum with tapered sections. Another riding buddy of ours has a 1979 Yamaha YZ490. He is never slow, and does not appear to be hindered by the mono-shock suspension. All rights reserved.