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Hi you mentioned that you defo getting spark is that from spark plug against side of engine, try this put a very small amount 50/50 pet oil inside cylinder head through sparky entrance screw spark plug back in try it now if it pops abit no matter after 5 times you have a carb prob float faulty jets blocked, blocked feed line, Advise you need a bowl petrol no smoking wash carb in it blow clean jets put back only when all is clean check petrol tube sometimes they go hard and block up make sure petrol is getting to cylinder head, hopes this helps
The ht leed runs very close to the cylinder, they can chaff through and spark against the cylinder, remove the top cover and pull the leed away from the cylinder and try again, the engine on this machine runs very cool, they are quite prone to carboning the rings in, once they lose an amount of compression they become very erratic and difficult to start, they really do not suffer with anthing else.
check your spark plug first #2check your plug wire,, it will ground out against the cylinder and sometimes the spark plug wire will come out of the coil and you wont be able to tell unless you take the pull start off and if you still have no spark the coil is shot
Check to make sure you have compression in the cylinder, place you thumb over the empty spark plug hole and pull the cord, if it blows hard against your thumb then it has good compression, if it has spark and compression it will start unless it is not getting fuel. Be careful when using starting fluid as to much of it can damage the engine. If there is no pressure against your thumb then there is a copression problem where the piston rings maybe bad or something is stuck open in the intake or exhaust.
Flush out the cylinder by running it with choke off, leave for 5 minutes then try to start again with choke on. Check that the air filter isn't dirty as this can cause too much fuel to be sucked in through the carburettor. Ensure that you have a spark by removing plug and holding body of plug against the metal of chainsaw body while pulling starter rope. This can be awkward and possibly risky. Ideally you should do this with fuel removed from the tank and allow the gas to evaporate from the cylinder. You also have to think of how to keep the spark plug against the chainsaw as it will bounce about while pulling the cord.
Possibly magneto problem.
Remove sparkplug and whilst wearing a thick rubber glove hold side of plug against engine head. Pull start cord and watch to see if there is any spark. If not replace spark plug first. If that doesn't solve it replace magneto.
If there is a spark then the plug may need cleaning and the gap may need adjusting, fuel mixture may be too rich
To test for a spark is fairly easy, start by removing the top cover, now remove the spark plug from the cylinder, i guess you do not have a spark tester, so connect a clean spark plug to the plug cap, now earth the threaded part of the spark plug against the alloy cylinder finns, make sure the plug is away from the plug hole in the cylinder, the reason for this is if any fuel escapes from the cylinder, you do not want a spark near that could ignite it, now make sure the ignition switch is on, and crank the engine, as if trying to start it, you should now see a spark at the plugs electrode. The earth cut out wire from the ignition unit should have a spade connection, this then pushes onto the terminal on the switch.