I have a chainsaw which starts well but will not run when the throttle is increased. As soon as I press the trigger the engine sounds as though it is being choked and then dies. I have been told that it may be caused by the crankshaft seals failing. the problem started some time ago and the problem got worse the more i used the chainsaw. Now it starts but will not run above a tickover
Could be a blocked jet in the carb or maybe the cold weather has upset the carb settings and they need bringing into line.
Try increasing the LOW fuel jet setting 1/8 to 1/4 turn out - its the one labelled L and see if it picks up.
J
Jules, December 2010
Crank seals if damaged will make it run lean not rich, with high erratic tick over, and over reving, running rich can be air filter blocked, exhaust port/muffler blocked, far to much oil in the fuel, incorrect carb settings.
