Fuel mix in generator cover

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Fuel mix in generator cover

Postby tr7dan » 12:34 pm Jun 19 2017

Hi

I'm struggling to find the cause of the rough running of my '99 kdx220r and on removing the generator cover to have a check in there I found about a teaspoon of fuel/oil in there - is it normal for a bit of mix in there ? Or should it be completely dry ?


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Re: Fuel mix in generator cover

Postby david » 01:13 pm Jun 19 2017

Should be dry. Sign of leaking crank seal.
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Fuel mix in generator cover

Postby cornishwrecker220 » 01:34 pm Jun 19 2017

If you power wash your bike you may get some water in behind the generator cover, likewise with condensation or ride through deep water....

The crank seals may of gone hard through lack of use which will let a small amount of mix through.... Start & run the bike for 5 /10 minutes then whilst the bike is at idle spray some wd40 or similar in & around the generator area..... If your revs begin to pick up or die then it's likely your crank seals are shot.
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Fuel mix in generator cover

Postby ohgood » 05:59 pm Jun 19 2017

tr7dan wrote:Hi

I'm struggling to find the cause of the rough running of my '99 kdx220r and on removing the generator cover to have a check in there I found about a teaspoon of fuel/oil in there - is it normal for a bit of mix in there ? Or should it be completely dry ?


Image

Dan



pressure test the cylinder. is very easy to get premix into the stator cover if the electric wires grommet isn't tight
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Re: Fuel mix in generator cover

Postby Julien D » 07:23 pm Jun 19 2017

If it smells and feels like fairly clean premix, it's probably coming from the LH crank seal. If it's wet and gunky and slightly oily, that could be a gasket or wire grommet. I don't see any water in that pic.
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Re: Fuel mix in generator cover

Postby Tedh98 » 09:01 pm Jun 19 2017

Pop the flywheel off and see if oil is leaking out of the seal like this:

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Re: Fuel mix in generator cover

Postby Jason » 12:12 am Jun 20 2017

Visual check / pressure / vacuum

Also, search for Eric Gorr and the intentions and sealant

This is somewhat common on E models
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Re: Fuel mix in generator cover

Postby tr7dan » 01:52 am Jun 20 2017

Julien D wrote:If it smells and feels like fairly clean premix, it's probably coming from the LH crank seal. If it's wet and gunky and slightly oily, that could be a gasket or wire grommet. I don't see any water in that pic.


Yep, it was fresh mix - in fact when I first took the cover off there was about 2-3 times more liquid in there but in the few minutes it took to find my camera, most of the petrol had evaporated.

Just waiting on a magneto puller so I can get a visual check on the seal - wouldn't you know, the puller I've had in my workshop drawer for the past hundred years is a rh thread !!

Tbh I'm expecting the worst, so I guess that means new crank seals then - not the end of the world though as I have quite good workshop facilities and now that I've retired I even have time to do it

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Fuel mix in generator cover

Postby tr7dan » 02:53 pm Jun 21 2017

Magneto extractor arrived today so I had a look at the seal - this is exactly as is after removing coil plate with no cleaning... there's a bit of muck in there but it doesn't look catasrophic to me and it doesn't look like oil has been pouring down from the seal ...


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Fuel mix in generator cover

Postby SS109 » 03:25 pm Jun 21 2017

Looks like a bad seal to me. Notice how there is more gunk at the bottom of the seal and it is wet? That is a classic weeping crank seal look IMO. Sorry.
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Fuel mix in generator cover

Postby Jason » 06:11 pm Jun 21 2017

SS109 wrote:Looks like a bad seal to me. Notice how there is more gunk at the bottom of the seal and it is wet? That is a classic weeping crank seal look IMO. Sorry.


Yes, it looks like it is leaking there.
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Re: Fuel mix in generator cover

Postby bufftester » 07:30 pm Jun 21 2017

Looks like a case in need of splitting
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