When I bought my 1992 Daihatsu in November I drove home (Victoria BC to Quesnel BC) with my 200kg BMW F650GS motorcycle in the back and could get the truck up to an indicated 105km/h on the flats with ease. At idle I could smell fuel in the exhaust and it had trouble starting when warm on occasion. After soaking the carb with WD40 and making sure the linkages were all free to move the truck ran and started great in all conditions - I can even start it at -32C without plugging it in - can't complain at all with the exception of my top speed. My max speed empty is 95km/h and it takes some time to get there - 85 is never a problem but after that it creeps up to about 95 and that's it. I can never smell fuel in the exhaust at all since the freeing up of the carb. I would like to be able to crack 100km/h again - part of the reason for getting the Daihatsu in the first place - my guess is that now that the carb can move freely, the mixture is a little lean. I know nothing of carbs - computer control VW TDI engines are no problem for me but carbs... ack! I don't want to mess up anything so I need advice. What are the three screws shown in this picture? What one do I have to turn to richen up the mixture a bit?