Hi all, I went to use my saw the other day and found that the truck box it was in all summer had taken on some water. I believe the saw was never submerged, just the tip of the bar. Anyway, I tried to start it for a bit and then gave up. Today I looked at it closer. I have confirmed that it has gas and spark. When I had the spark plug out, I noticed something riding on top of the piston. It seems to be a bit of silicone. Pictures of the object are attached. The saw was run on premixed TRUFUEL all last spring. I know I shouldn't leave old fuel in an engine for long periods, but that is what happened. Does anyone have any ideas on what to try next?
That is an interesting piece of stuff to find on the piston. If it is silicone I'm guessing it was excess that squeezed out during assembly. The only thing that I can think of if you have spark and fuel is timing is off or the crank seals went bad. My uncle has a cs6700 that ran flawless until last fall when it stopped on him cutting down a dead ash tree. We tried everything but it turned out to be bad crank seals. One other thing is the needle could have dirt on it and the fuel is just running through and flooding the saw keeping it from starting.
You sure that's silicone like? It looks like solder to me, like someone measured squish on the saw and left it in there. Did you buy this saw new? Start with a teaspoon of mix in the plug hole. Does she fire and die then?
Welp, I got her running! I tried that, and gave it lots of pulls, but it didn't start. So I thought I'd try some fresh gas in the cylinder again, but the spark plug was so wet that I thought it might be flooded. What finally worked was pulling on it without the plug in, and the choke off. When I put the plug back, it ran for a second. Wouldn't start again, so I removed the spark plug again and gave it a few more pulls. Now it's working. So, what do the saw gurus think it was? Just bad gas, crap in the carb, something else, or all of the above?
This is what happens. When you flood a 2 stroke engine like a chainsaw there is raw gas that can collect in the crankcase. So by pulling it over without the plug the raw gas gets pumped up through the transfer ports into the combustion chamber. Then it also exits through the exhaust port and the spark plug hole. Eventually it will dry out enough for it to start. If a saw does not start I always pull the plug so I know if it is flooded or if it is not getting enough fuel.
Glad you got it running, Rumpy! I'd guess the old gas started the problems. This new fuel with ethanol is garbage!!!
