4 RX1M's cut out at same time!

[FastAction]

alien spacecraft could have been cloaked and was flying at a low alltitude.They have been known to screw with anything electronic I think I drinlk to much

 

[Sled Dog]

Sounds to me like your air filters were all blocked off with ice and snow. All doing the same riding is why each machine went down roughly the same time.

 

[BlgsRX-1mtn]

I'm betting the dewpoint was close to what the temperature was and caused all to temporarily ice. Even blown funny cars on 90 deg days will ice up if the temp and dewpoint are precisely the same. Thats why they spray de-icer into the intakes after the burnout (to prevent icing up on the full run).

My sled did that last year. And I pulled the airbox cover off; I could see ice crystals around the intake of the carb. Started the sled and cracked the carb heater for about thirty seconds to de-ice the carbs and shut it (heater) off. Rode the rest of the day flawlessly. Temp that day was mid 40s but the dewpoint was also in that area.

 

[Yakuza]

Ski bum, believe it or not we too had the same problem yesterday @ 9,000 ft. It must have been in the 50's, I was riding with no jacket and gloves. My friends Rx died going over a boulder and couldn't get it started unless the choke was on. On the other hand, the last time I had that problem was last year going up on a steep incline and the the motor cut out on me. Couldn't get it started unless the choke was on. Since then I kept the carb coolant/heat to the off position. I think Newcastle Scott has a point.

 

[RX4fun]

ski-bum
Were you by chance up on Mount Shasta? If so the answer has to be the local "Lemurians" I am sure you know about them, they reside inside the mountain according to Indian lore. They were probably just having a little fun with your group.

 

[A K MtnViper]

I had the same problems till I installed a Carb Heater shut off valve. I don't even consider turning on carb heaters till it is 0 degrees F or colder. The first thing I notice is the top RPMs drop off 200-300 if the carbs (and maybe fuel lines) start getting too hot. Taking a break with the hood open on warm days really helps.

 

[ski-bum]

Ya, I think too much pressure in the fuel systems under the right conditions. I stopped for a short time afterward with my hood open to cool things down and noticed bubbles moving through the fuel tank breather. I cracked the gas cap and there was definitely a little pressure built up inside the tank. I guess I need to recreate everything under laboratory conditions to see exactly what was going on, but would still be hard to factor in the Lemurians.

I just talked to two other RX1 riders who were riding about 30 mi. east of us, and they both had the same thing happen at about the same time of day! They also had no trouble before or after.

Thats SIX sleds, all with slightly different set ups, carb heat on, carb heat off, didn't matter, affected all six in the same way at about the same time of day with no problems before or after :?: .

 

[tundra]

sudden barometric Pressure drop.

 

[smokeless1]

This the trouble with carbs in the mountains, or higher elevation. Barometric pressure will play games especially if the pressure increases or drops quickly. Sounds like this was what caused your problems. Either the pressure rose quickly (likely) or it dropped which caused the carb float to lock up. No fuel, no go. Next time, tap the carb, loosen the fuel cap and bet it will start again.

BTW this doesn't happen with EFI. Used to see lots of people with trouble climbing mountains during the good old carborator days Pre-1985. Now with efi, nobody stalls out going up elevation.

my best guess