Josef wrote:I have a 2004 Craftsman 27” 8hp snowblower that has seen little use. It began this year running weakly, and tending to surge rhythmically. It made it through the first snowfall, but halfway through the second it quit. It will restart OK, but dies about 15-45 seconds later. Successive restarts die a bit quicker. Going to half choke makes it last slightly longer. I’ve pulled the carb, blown out all the passages, hit them with carb cleaner as well and run a fine wire into all the passages I could get to. Also blew out the fuel line back to the tank. Nothing appeared gunked up at all, but since it seemed likely to be a fuel problem I did all the above anyway. No change whatsoever in the symptoms following the above. I then tried spraying some fuel directly into the carb after starting it (as it began to quit), and that only kept it running a few seconds longer. My conclusion is that it isn’t a fuel problem after all. While I had the carb off I did notice that there was some bluing on the stem for the intake valve (just above where the valve widens out). So now I am thinking that perhaps the intake valve begins to stick as the head heats up (resulting in some burning of the mixture before it enters the cylinder, thereby heating the valve stem). A compression check yielded 55-60 psi while the engine was cold. Your thoughts/suggestions?
peanut budda wrote:With Briggs you will never see more than 55-60 psi on compression. If you do suspect a valve adjustment issue or some serious carbon build up, if less suspect internal damage, wear or mis-adjusted valves.
have you checked the tank vent ??? vacuum lock can and will happen if tank vent is plugged
you blew out the carb... rubber tip or metal tip on the inlet needle ??? Metal tip will tend to act funny. it can stick in the rubber seat more so than a rubber tipped needle. I would purchase a rebuild kit and recheck after rebuild.
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