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Old 09-05-2013, 01:51 PM   #1
sonoran OP
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Cylinder missing during water crossings

Did a few deep water crossings last week and found that once cylinder would cut out then come back on again when on the far side. Needless to say this caused a bit of pucker factor. Not sure which cylinder it was and not sure even where to begin for troubleshooting.

Any ideas?

Thanks in advance.
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Old 09-06-2013, 01:55 AM   #2
uk_mouse
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Reminds me of that alleged aircraft maintenance report:

Report: "Right engine missing"

Reply: "Right engine located in its correct place on the right wing."

Sorry :)


My guess would be water getting in to the carb vents that dangle out of the bottom of the airbox. How deep was the water?

Changing those vent hoses is problematic as the carbs seem very touchy on having the correct air pressure in the float bowls. You could check out this thread: http://www.advrider.com/forums/showthread.php?t=906385
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Old 09-06-2013, 04:07 AM   #3
charlie264
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Clean and silicon grease the HT coils...if waters getting in the spark will ground...
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Old 09-06-2013, 06:37 AM   #4
Boatman
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I've had a similar experience in deep water (bottom of air box in the water). Can't say for sure it was one cylinder in particular or both. It sure does give you a pucker when the engine starts sputtering in the that deep. I have dual vents, one high and one low so I'm fairly certain venting wasn't the issue. I think it may have been ingesting enough water to cause missing but not enough to drown out.
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Old 09-06-2013, 09:33 AM   #5
sonoran OP
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Sorry, forgot to mention it's a 990 so no carbs

water was about 2.5' deep:



I'm thinking electrical because as soon as I cleared the water the 2nd cylinder fired right back up.

Will check/grease the coils.
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Old 09-06-2013, 09:52 AM   #6
usgser
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Dielectric grease is your friend.
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