Chain Saw Start Problem

[tgahall]

I have a craftsman 24", 3.7cu. in, 2 cycle chain saw. While pulling start handle, parts of the starter pulley and starter dogs broke.

After replacing the broken parts, the saw won't start. Checked spark - OK, checked gas - OK.

With spark plug removed, pulling rope, engine turns over OK. Put spark plug back in without spark plug wire, it is hard to pull crank. The engine makes one revolution at a time, with a lot of resistance to turning on the compression stroke.

It seems almost like some sort of vacuum/pressure lock. As far as I know, there is no valves to check(intake/exhaust).

What could cause the interference with cranking rotation(Plug In,
Spark plug wire removed)? It appears to be pressure/vacuum related.

Will greatly appreciate any advise.

 

[Walt Galer]

Howdy,

|Assuming that your hard to pull over complaint is due to hydraulic locking from a flooded cylinder, try a test: Pull over until the hard to pull over effect is experienced. Then take out the spark plug and see if it is wet. Turn the saw over immediately, and see if fuel runs out the spark plug hole. If hard to pull over from the get-go, you may have a carbon build-up problem.

Your problem could be due to a stuck open inlet needle in the carburetor allowing the cylinder to fill with gasoline. This could be expected if the saw was left with gas in it. This sort of problem can happen in only a couple weeks storage, especially if 87 octane fuel has been used, and especially if purchased from a station who does not sell much gasoline and has had old inventory.

There are other causes of this, including carbon buildup in the cylinder due to excessive rich running. All are generally caused initially from behind the handlebars. Try a basic diagnosis as above, and come back. We have ample folks here to argue your problem out and give you a reasonable and easy fix. You'll just have to overlook all the ????-kicking in the meantime!

Regards,
Walt Galer