Question about Stihl 028 Chainsaw Crank & Case
Starts easily, good compression and spark, runs well for 15-20 minutes, then bogs and dies
Check fuel filter, fuel tank vent and possibly clean carb and replace carb diaphrams
Posted on Mar 07, 2015
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Posted on Jan 02, 2017
hey have the same o25 stihl,great saw when their working right.have had to replace fuel line to carb 5x over 7yrs.hairline crrack and it will **** air and conk out in 2-5 seconds.also there is a pulse line to carb which can also crack.if you have good spark at plug its likely a fuel delivery problem. collin
Posted on Jan 15, 2011
First check your fuel filter. Its on the end of the pick up tube in the fuel tank. Could be clogged. this is a relatively easy and inexpensive place to start. Make sure the fuel supply isnt pinched anywhere along the way.
Could be a scored cylinder. A scored cylinder is common problem with all makes of chainsaws. If you dont take special care to keep the air filter clean and in perfect working condition, the wood chips and dust will enter the combustion chamber and score the cylinder walls, ruining the rings causing a loss of compression.
The piston could also have been damaged from running to lean of fuel to air mixture causing heat damage to the piston and cylinder.
Hope this was helpful. If so, gimme a thumbs up vote!
Posted on Feb 01, 2011
SOURCE: Stihl 021. Starts but will not
You indicate you replaced the carburetor kit, did you check for dirt and clean the carb and install the kit very carefully, and make sure all the gaskets on the carb and between the intake and carb have no air leaks? The first thing is to try to adjust the low speed screw to give you a faster idle, it is the screw with a spring, on top of the carb where the throttle cable hooks up. Turn it in (clockwise) to give more idle speed. Now locate the mixture screws on the carb, they are on the side of the carb and also have springs on them. They are marked with an L or H on the carb body beside the screws. Turn them both in (clockwise) until lightly seated then turn them out (counterclockwise) 1 turn or if you prefer turn them to the position they were before you took the carb apart. 1 turn out is the recommended position by the manufacturer so the engine starts and runs, sometimes this is the right position. If it does not idle properly, remember this position and turn the idle mixture screw out (counterclockwise) in 1/8 turn increments until it runs properly 5 or 6 times or more if it runs better. (When turned out you are adding more gas to the mixture). You could also try the high speed mixture screw and see if it helps with the idle, but do not turn in (clockwise) to less than 1 turn out from a lightly seated position, to prevent overheating. If this doesn't help, check the air and gas filters, the gas tank and fuel lines for blockages. Check the spark plug to see if it is wet and if it isn't no fuel is getting to the engine. These are a few suggestions for you to try. Hope this helps a bit. All the best and good luck.
Posted on Mar 04, 2011
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