Why does my snowmobile keep shutting off after a short period of time? It will...

Bill

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...idle forever, but can't run it.? I have 2 1994/1995 'Ski Do Safari' (something like 380cc approx.) that both have less than 200 miles on them. They have been garaged kept since I got them 2 years ago and were garage kept under the previous original owner. I am the second owner. I had the carbs cleaned/checked, flushed/cleaned gas tanks, fixed/changed any/all fuel lines. If they just IDLE then they will run until fuel runs out. But, if I give either one throttle for only a short period of time then they both will just shut off (as if there is a problem with fuel delivery, but everything is new, clean or in excellent working order, as far as I can tell). I can ride only a few laps around the property until they shut off. But once they do shut off, I can choke (prime) them a few times and give them less than 6 pulls and they both start right back up, run great for another short period of time then shut off again....and so on.... (also, once they shut off and I get them running again, they can still sit and idle for however long the fuel allows). They both have working oil injection systems, yet I even experimented with disconnecting the one and running actual mixed fuel in the one. Same problems, nothing different. Someone mentioned to me that the little box that the fuel goes into from fuel tank to carb, the box that is in-between the tank and carb, can hold water and cause problems. When the carbs were cleaned/checked, each sled's "fuel box" (whatever they are called!) were also cleaned/checked. I only run premium gasoline in all of my toys/machines except the ones that specifically calls for regular unleaded fuel (i.e. my 2007 truck calls for regular, etc etc) but all chainsaws, small machinery, quads, snowmobiles and etc. all get 93 premium fuel. Another friend mentioned that 'dry gas' can actually help if the snowmobiles have water or a problem with water in the lines/tanks...but I wasn't sure if this would hurt them so I only tried it in the one, but it did not do anything to help or hurt. The only snowmobile service center (mainly a sales center, not so much service) will not even look at them because they are Ski Do. I cannot drive to the next closest one and I know many people who are mechanically inclined yet they have not had a chance to check out these sleds. Maybe someone can give me an idea of what I can do or what I should do. Thanks for your time!!
 
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