dsell
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I picked up a low hour Dolmar 510 and it's having problems at idle. The fuel tank was empty when I bought it and I believe it had sit for a long time. The fuel line appears ok but I have not changed it. The fuel filter looks like new. Plenty of compression. The first time I took the carb off, there was water on the fuel pump side. No corrosion in the carb and it was clean other than the water. The piston looks like new from the intake side. This saw runs excellent at top end and pulls a 64 DL 3/8 with no problem in hedge. I've ran two tanks through it now and it's still very inconsistent on idle. It leans out, increases in RPM, then dies. I have to choke it to get it running again, even when hot. If it dies while I'm holding it, I can quickly give it full throttle and it usually starts the first pull without the choke, (the saw is warmed up). I cut the limiters and fattened up the low, increased the idle. Throttle response is excellent now. Are there any known issues with these saws such as carb problems or air leaks? I read the 5100 may spin the crank bearing, but did that happen on the 510?