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post #1 of 16 (permalink) Old 11-26-2011, 11:39 PM Thread Starter
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Coolant leak

We went for a beautiful ride today and the bike was running really well, so later this evening I thought I'd hook up my manometer and see how the carbs were sinked as a point of reference.
When I started, the engine was just warm from today's ride but not hot and in a few minutes she started to drip coolant. I traced it to the valley below the carbs where it was collecting and dripping down the front right side of the engine while on the center stand.

I'm hoping this is not a head gasket.
Where should I begin checking? I'm hoping its a hose or thermostat.

Bike is '03 with under 6,500 miles. During today's ride I noticed the temp climbed to the 1/2 position just left of the temp symbol. It was mid 70s today and I never pushed it hard because my wife was on the back.
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post #2 of 16 (permalink) Old 11-27-2011, 01:47 AM
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Your temp readings sound normal ...

Bad news is coolant found where you described is usually from a base gasket, not head gasket.

You could try re-torqueing the cylnders.....

This post should have been put in the "Engine/Exhaust/Cooling" page BTW.....

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post #3 of 16 (permalink) Old 11-27-2011, 12:17 PM Thread Starter
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Thanks for the input KM.

I'll re-post in "Engine/Exhaust/Cooling" once I get working on it.
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post #4 of 16 (permalink) Old 11-28-2011, 01:00 PM
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I had the o-rings go bad on the metal pipes that go into the top of the cylinders. Depending on which side is leaking and what angle the bike is sitting, it's possible, i would guess, that a leak from one of those pipes could collect below the carbs. It was an inexpensive fix, but a bit of a pain in the butt to get to.

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post #5 of 16 (permalink) Old 11-28-2011, 01:30 PM
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That was the first thing I thought of as well. My pipe leaked there. It was a simple o-ring fix. Hope you are that lucky. I'd dry everything off & watch for the leak since you know the vacinity it's leaking from.
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post #6 of 16 (permalink) Old 11-28-2011, 10:27 PM Thread Starter
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Quote:
Originally Posted by kanuck69 View Post
...dry everything off & watch for the leak since you know the vacinity it's leaking from.
Just did this and it's the gasket at the aft base of the fwd cylinder. Had my fingers crossed all day at work too. Stupid fingers
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post #7 of 16 (permalink) Old 11-29-2011, 08:18 AM
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Quote:
Originally Posted by TimV65 View Post
Just did this and it's the gasket at the aft base of the fwd cylinder. Had my fingers crossed all day at work too. Stupid fingers
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post #8 of 16 (permalink) Old 11-29-2011, 09:13 AM
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I tore my motor apart for the cylinder base gaskets, replaced everything else while I was at it, water pump impeller, all gaskets, all seals, dampeners, etc.

Figured while it was apart anyway......

Jon

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post #9 of 16 (permalink) Old 11-29-2011, 09:14 AM
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Quote:
Originally Posted by TimV65 View Post
Just did this and it's the gasket at the aft base of the fwd cylinder. Had my fingers crossed all day at work too. Stupid fingers
Same place mine was bad.

Jon

93VN750, under re-construction
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Coastered
Degoated
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Dunlop D-404's
23,XXX miles and holding pending gasket change (underway!!!)
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post #10 of 16 (permalink) Old 11-29-2011, 10:04 AM Thread Starter
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Quote:
Originally Posted by 93VN750 View Post
I tore my motor apart for the cylinder base gaskets, replaced everything else while I was at it, water pump impeller, all gaskets, all seals, dampeners, etc.

Figured while it was apart anyway......

Jon
If torquing the cylinder doesn't work I may do the same thing. Shame with only 6,500 miles.
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