i have two 700, efi well maintained. i have never had any problems form them. this year when i took them to south fork, CO. both would run for an hour or so then dies as if they were out of gas. then, after they sat and cooled off , 15 min later, they would start and run for another 30 min. or so.
i took to shop and they were no help. they replaced several expensive parts on both and they still have the same problem. has anyone heared of this problem ? has anyone heared of a fix for this problem ? thanks for any help.[img]i/expressions/face-icon-small-confused.gif[/img]

 

When they stop running, check for spark at the plug. If no spark, change plug. If still no spark, replace ignition coil. If you HAVE a spark, check fuel path to engine. Your fuel tank vent tubes could be cracked, kinked or stopped up, fuel filter may have water from condensation, or fuel pump may be failing.

And, as odd as it may sound, the gas cap seal could be worn out, allowing too much air in the tank; resulting the fuel mixture being wacky from sucking air in with the fuel.

Hope this helps

 

Another thing to check is the plastic boot between the cylinders and your throttle body for cracks. One of our riders had this problem with his 700 out in Utah last week where it would run OK at first but after a while it would start running very rough. He was changing plugs thinking that was the problem until he discovered a large crack going around the boot next to the throttle body end. This would allow too much air to get into the fuel / air mixture and depending on the size of the crack it can have a major impact on how the engine performs. Evidently this is a known issue with this machine and a better replacement part has since been produced for it...