Suggestions for sealing coil from water leakage

[Nimbus]

Hello folks,

At about 13K I replaced my plugs and found that one (probably the exhaust plug on cylinder#1) was rusted. A white looking patina with some clear rust spots all over the metal part of the lower plug and down to the washer. No corrosion on the plug threads at all.

At 26K (last week or so), I did a valve adjustment and replaced the plugs again. This time the same plug was corroded and a second coil looked "rusty" in the gap in the plastic.

Any thoughts on how I might be able to waterproof them? I put a bit of dielectric grease on the contacts inside the coil contact and around the rubber boot/flange that sits on the cylinder cover.

 

[stutrump]

I had exactly the same. Most folk seem to recommend the grease as you have already done.

 

[datjackal]

Hello folks,

At about 13K I replaced my plugs and found that one (probably the exhaust plug on cylinder#1) was rusted. A white looking patina with some clear rust spots all over the metal part of the lower plug and down to the washer. No corrosion on the plug threads at all.

At 26K (last week or so), I did a valve adjustment and replaced the plugs again. This time the same plug was corroded and a second coil looked "rusty" in the gap in the plastic.

Any thoughts on how I might be able to waterproof them? I put a bit of dielectric grease on the contacts inside the coil contact and around the rubber boot/flange that sits on the cylinder cover.

What is the exhaust plug ?

 

[Don in Lodi]

What is the exhaust plug ?

The plug closest to the exhaust valves. The other would be the 'intake plug', being closest to the intake valves... in a normal layout. Everything is pretty much equal with four valves and two plugs per hole. He's just differentiating the inside and outside plugs is all. One got more moisture than the others.

The rubber seal at the top of the coil tower should be the seal that keeps water out. If they're a bit dried out a smear of dielectric grease would be a help. I'm trying to picture if there's a route for blasting water in there with a pressure wand. That front motor mount does a pretty good job of covering the front. A POI, don't use a pressure washer on the head.

 

[Nimbus]

I almost never wash the bike! And I certainly never use a pressure washer (or even point the hose toward the engine). As near as I can tell, the corrosion hasn't changed the way the bike runs (as the plugs seem to fire). Anyway, thanks for the input.

 

[sail2xxs]

I had the same issue with my 2012, and it got worse over time. Yamaha replaced the corroded coils under warranty 4 times. Grease works for a little while, then wears off. Sealing the top with liquid gasket sealer didn't seem to help either. Traded the bike for a 2014, so never continued the search for a solution.

Best,

Chris

 

[Checkswrecks]

See this thread:
http://www.yamahasupertenere.com/index.php?topic=9743.msg161732#msg161732