I have a 2001 ish T190 that I am replacing the drive belt on but I am not sure on the re-tensioning procedure, is there a guide somewhere I could use? Also, I have been using this machine for about a year and one thing that has always bothered me is that it bogs down under load, I also see smoke coming out of the exhaust when this happens. I have read that this could be do to the pick up pump? Any suggestions would help.