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two cylinder experts

M

Mikein Ky

Member
My 520 starts and runs great as long as I start it every day or two. If it sets for a week it almost impossible to start. Today I finally had to pull it. It still went about 300 yds. before it started. It don't hit at all, it just cranks with a little smoke out of the muffler. Now it will start the first time it turns over. If it sets a few days, it won't start.
 

First thing that comes to mind is the carb running dry due to a leaky bowl. The engine needs to be cranked long enough for oil pressure to build up and open the fuel valve to refill the carb. It can take awhile depending on how fast oil pressure builds up when the engine is cranked. There's a knurled knob on top of the fuel shutoff that can be loosened a few turns and then pushed down to allow fuel to flow to the carb before you try starting it. Jim
 
Well a 520 has a lo oil pressure shutoff on the fuel sediment bowl which could be restricted and/or oil drained back from it. There should be enough fuel in the carb bowl though to at least get it started. The other thing that "time" will affect is electrical connections and/or elect contact points in distributor scumming over. Sounds like electrical corrosion somewhere to me. A partially corroded starter selenoid terminal once started will re-start all day long but wait a week and it won't connect. just an example. If that don't do it , change the condenser , they do some odd things when going bad.
 
I'd think it might be one or both of the following 1-float-needle
valve not functioning correctly and flooding the cylinders and
or 2-the oil pressure fuel shut off is not completely closing off
the fuel flow and flooding it.
 
I have to do the same thing with my 620 if it sits for a week. Don't
know where the fuel goes but if you watch the sediment bowl you
can see the new fuel circulating into the bowl.
 
Thanks for the input guys. I should have added that I have already replaced the automatic fuel shut off with a regular sediment bowl, so I can make sure the fuel is off.
 
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