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Author Topic: Radiator Fluid in front Spark Plug hole  (Read 234 times)

pumbaa

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Radiator Fluid in front Spark Plug hole
« on: October 05, 2018, 04:39:34 PM »

Any ideas about what would cause my front cylinder to accumulate radiator fluid in the Spark Plug hole? The radiator is not leaking. My spark plug cap is sealing well. I have not ridden in any rain. The bike has sat a month or so. But each time I have ridden it the front cylinder stops firing mid ride when its idling. But if it is revved up it runs fine. I have pulled the front plug and there is moisture on the plug and in the cap. I have checked the drain hole and it is free and clear. The front spark plug is coroding from the moisture. I have smelled it and It smells just like radiator fluid. I don't know what could be causing it. Any idea's? I may be left with having to pull the head off and checking for cracks. Th exploded view of the engine doesn't show much of the bottom of the head so I can't see the water passages. I have also replaced the spark plugs twice.
« Last Edit: October 05, 2018, 04:42:48 PM by pumbaa »
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spit051261

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Re: Radiator Fluid in front Spark Plug hole
« Reply #1 on: October 05, 2018, 05:12:52 PM »

Leaking intake manifold or head gasket
Surprised it's running OK .
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pumbaa

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Re: Radiator Fluid in front Spark Plug hole
« Reply #2 on: October 05, 2018, 07:11:54 PM »

I kind of thought that too. But its not blowing smoke. Its like its cracked inside the spark plug hole area. No loss of compression.
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spit051261

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Re: Radiator Fluid in front Spark Plug hole
« Reply #3 on: October 06, 2018, 02:24:13 AM »

Have you done a compression test yet ?
Is your oil milky ?
How many K's on the bike ?
I am a sparky so where are all the mechanical gurus too ?
This is a "real" fault so come on upside-down, Joss, Hylife etc.
Help the guy out .

« Last Edit: October 06, 2018, 03:12:29 AM by spit051261 »
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stigger

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Re: Radiator Fluid in front Spark Plug hole
« Reply #4 on: October 06, 2018, 03:32:53 AM »

Is the thermostat leaking?

That's above the heads with a pipe leading to each one if I remember rightly

Can't be head gasket as the plug is in the head unless there's actually a hole from a waterway into the plug?

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LX_SS

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Re: Radiator Fluid in front Spark Plug hole
« Reply #5 on: October 06, 2018, 03:56:14 AM »

the spark plug caps should have a rubber seal to stop water dripping down into that area if original or fitted correctly.

chance are its in the head itself leaking water.
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spit051261

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Re: Radiator Fluid in front Spark Plug hole
« Reply #6 on: October 06, 2018, 04:00:21 AM »

I thought it would be a head off job either way and stop using it until it's repaired .

« Last Edit: October 06, 2018, 04:13:53 AM by spit051261 »
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2turbos

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Re: Radiator Fluid in front Spark Plug hole
« Reply #7 on: October 06, 2018, 01:24:13 PM »

Check and see if, when the engine is running and warmed up, there are air bubbles forming in the in coolant recovery tank. That would indicate a head gasket failure. Combustion pressure getting into the coolant system.
If not, then a possible crack in the cylinder head.
I would try a coolant system stop leak and see if that stops coolant from getting in the spark plug area, not as a permanent repair but only as a diagnostic method. You may need to repair or replace a cylinder head.
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