Posted by Fatamus on April 13, 2020 at 11:04:54 from (72.35.100.25):
In Reply to: Chain Saw Help posted by Dave41A on April 13, 2020 at 09:37:40:
Hi my name is Fat Dan;
My experience with a chainsaw is I built a cordwood house two stories 3600 sqf. any way back to your problem.
All of these ideas are excellent advice and any one of them can be the problem. The Idea is to start off with the cheapest and easiest things first when troubleshooting. Which order you attack your problem is up to you; with that I'll give you some more areas to look at for trouble.
Today's gas has ethanol in it which has water, when fuel is stored over time the ethanol separates and the water accumulates. When fuel separates the system will gum up vital parts, e.g. high/low jets, diaphragm, float valve, filters.
Whisker in the spark plug: a whisker is when there short between the electrode and anode (piece of dirt in the gap). A bad spark plug can have broken porcelain, lose tip, fouled out or just used too much when it was new.
If the cloth type filter gets water wet it will not allow proper fuel flow.
USUALLY - If you take the carb apart you will find varnish left by the fuel residue has things block up. Simply by you removing the parts and cleaning them then replacing them gives the saw half a chance.
Hoses and gaskets: these little saws run on vacuum check lines and gaskets to and from and in the carb. Closely inspect the diaphragm gaskets/flapper-valves make sure they are clean and flexible.
A bad coil (unusual) can cause intermediate spark.
Spark Plug wire has short - pull over in a dark room and look for external spark.
Good Luck
Old pictures but gives a better idea of construction.
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