I have a 10 850xp that starts fine all summer and when the temps drop to around 35 it starts hard but I can get it to start but when it gets below 20 it won't start. The dealer put a new fuel pump (they claim the pressure was to low to start it) in last winter it took so long to get fixed while waiting for a fuel pump (5 weeks) that the temps warmed enough that it started or the new pump is getting week again. I really don't want to take it back in and they say another 500 will fix it I'm hoping I can fix it myself with your guys help.

 

Only thing I can think of is do you have the battery on a charger/maintainer when the weather gets cold? Cold can sap a battery down to where to where it doesn't have enough "umph" to start. Plus don't touch the throttle until it does or you can foul a plug.Don't know if there is an after market pump yet on the 550 and 850 if this is the problem.You might try turning the ignition switch on and off which cycles the fuel pump several times and see if it helps on cold starts. If you have access to a fuel pressure gauge for the fuel rail, the pressure should hold steady at 43 psi. OPT

 

I've cycled the switch when it wouldn't start and that wouldn't help at least not right away. I would walk away and it would go after quit a few cycle of spitting and sputtering and seemed like it was warming up the motor and outside temp was also coming up.

Don't use the tender but gonna try that to see if that helps.

The fuel pressure was down on the original pump that is why they put in a new one. If I can't figure it out myself it will have to go in to get checked.

Lucky me they say they have never seen a problem like this before!