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07 420 FM stalling when i hit water

12271 Views 12 Replies 5 Participants Last post by  KESS079
ko, here it is. I have a 2007 420 FM and I can ride trail and lite mud all day, no problems. BUT, when I go to really play and get in some water, this thing will stall. Air box has always been bone dry. It will start back up right away but then under load, it stalls again! I have dielectric greased the spark plug and all the electrical connections I can get to.

Any suggestions, I really like the machine but this is getting frustrating!

Thanks guys
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Maybe you're having a problem with steam getting sucked up into the intake. I don't know if the 420 Rancher had a problem with that or not, but Yamaha had a problem with the early Grizzly models, because of those plastic panels that cover the engine on each side. When you would go through water, steam would get trapped in the engine area and couldn't get out because of those panels. The steam would get sucked into the intake and the engine would sputter and die. They fixed the problem by putting vent holes or slots in the panels so the steam could escape. I don't know if that would be a problem on the 420 or not, but they have those engine covers. Just a thought.

You might pull those panels off and try going through water and see if it helps. If that's not the problem, I don't know what would be wrong, since you've already put dielectric grease on all the connections.
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Yep, the 420 is fuel injected.
my 2 cents take panles off and with a garden hoes spray small areas by eletical stuff and see ware it mite stall ?
That's an ideal that might work.
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