Hi I live in Mexico where the TS185 is still available new. I bought one last year and have been happy with it. The main jet on the carb should be a 195. This only controls the mixture at full throttle though. Between the one quarter and three quarters open positions on the throttle the mixture is controlled by the needle jet. You can adjust this by removing it (just take the top of the carb off and pull out the barrel) and moving the clip on the top of the needle up (weaker mixture) or down (richer). At idle (closed throttle) the mixture is controlled by the air screw on the right hand side of the carb. Anticlockwise (weaker) clockwise (richer), but don't take it out more than three full turns . Here I live at an altitude of 500m the bike was running a bit rich at 4000 rpm so I moved the clip on the needle jet up one notch and now it is much better. I have big problems with this bike when I go up in the mountains here. Anything above 1000 mts (some are 2000 ) and it runs really rich and lacks power. Pretty nasty if you are off road on a steep incline I can tell you. I think it really needs a slightly smaller jet even at this altitude as I think it is running rich at full throttle. Haynes produce a workshop manual for this bike which is very detailed and parts are still produced. Good luck