My first thought is water in the fuel. Try some fuel antifreeze and see if that helps. Either that or completely drain the fuel system, refill with fresh gas straight from a pump, and add a little antifreeze as well. That's where I would start.

 

...The water would freeze, causing it to not start, and then thaw again when brought into a warm shop.

 

x2 on what @Tigman186 said. If you have to use corn/gas, always use Sta-Bil 360, or Highway 95, or one of the other ethanol fuel "fixers" everytime you get gas. If you are able to use real gas without "corn squeezin's" in it, for your extreme cold weather, always use some dry gas in case you get some condensation, or in case your gas station has some water in their tanks. The busier the gas station selling the highest volume of gas is much less likely to have water condensation build up in their tanks.

 

Hey...grizzlyfish..welcome back.

If you Griz starts fine when in a warm environment then won't start when in a cold environment. Most likely needs the valves adjusted.

 

@reogem, makes perfect sense.

 

When you cranked it over did you try to open the throttle a little at the same time?

DEWFPO

 

Thanks everyone for all the help. I added some sea foam to the tank and will check the valves in the coming weeks, Im also going to change the oil out from 10w40 to 0w40 to try and help the hard starting.

Thanks again

 

I left mine outside recently overnight and it did the same thing. It was -11. One hour inside and it fired up no problem. Valves were just adjusted and I use the enzyme additive to manage the ethanol. Not sure what the problem was but it lives in the garage now overnight


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Just another thought, and probably @reogem or @dezz or some of the other guys hopefully will chime in on this. It's pretty obvious that if it's sitting out in the middle of a lake it's not connected to a battery maintainer. @JEMacEwan, when yours was outside in the cold was it on a battery maintainer? The reason I ask is this. Mine sits inside an unheated garage all the time. It's always connected to a maintainer. It has not had the valves adjusted yet. It always starts, no problems. We had two weeks of -2 to -10 recently, no problems. My elderly neighbor has a riding tractor with a snowblower on it. I take care of his snow removal for him. Last winter I was having all sorts of trouble starting the thing. It would crank over pretty well, not fire up, then the battery would pooch. Got him a Battery Tender, fires right up every time. I realize the engine is far different, but on that tractor, in real cold the battery just did not have enough juice to crank the engine fast enough long enough for it to start. Suppose this could be part of you guys problems?

 

No it wasn’t. I do use one inside but this was one night I had it on my trailer overnight not connected.


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My 660 was doing the same thing. Adjusted the valves and starts better than ever has.. Mine was to the point it would run the battery dead and if it did happen to start I would have to stand and hold the throttle or it would die, now I pull the choke and it starts right up and will idle till it warms up.