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Discussion Starter #1
How can my gearbox spew oil out of the breather tube when the oil is at the correct level ?
 

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2015 Outlander XMR 650
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I'll bite- how?
 

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Discussion Starter #3
I'll bite- how?
Gearbox fluid ( Valvoline 75 - 140 full synthetic ) came out brown after maybe 300 miles of riding .
The rear pipe is awfully close to the top of the gearbox.
Is it a coincidence that I'm still trying to figure out why the exterior of this engine ( especially the pipes ) is , suddenly running very hot ? Is the pipe that hot that its cooking the lube all of a sudden?
Been riding this thing over 6 years and now I notice alot of engine heat .
Cooling system is fine , fan comes on normally , no codes and the pump is moving coolant .
 

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That's an entirely plausible possibility, heat's about the only thing that would cause gear oil to expand......

Million dollar question is is it some tolerance or tolerances in the gearbox causing the elevated temps? Or as you questioned- the rear exhaust pipe.

If we thought ahead of these things, lol, we could get a "normal" operating temp on our diffs and gearboxes, to compare to whatever you're experiencing now....
 

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Discussion Starter #5
The whole engine area has gotten hotter in the last 5 or 6 rides .
I am doing nothing differently than I have in the last 6 years.
 

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Discussion Starter #6
Pulling the heads this week .
I pulled the plugs and have quite a bit of carbon on the bottom edges , I can only assume the tops of the slugs and lower valve stems as well as the cc's surfaces are like this too .
Maybe causing preignition ?
 

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Discussion Starter #7
...and the gearbox lube was completely free of filings / shavings / metal.
 

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2015 Outlander XMR 650
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..... I got nothing......
 

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Discussion Starter #10
Pulled the pipes last night , nothing unusual inside although a little black .
Going to see if I can peer into the exhaust ports with a flashlight and the phone after work ....
 

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Discussion Starter #12
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Well , here we go :
I think I found the problem .
I pulled the plugs & pipes , put the front slug @ TDC & sprayed some Seafoam Deep Creep down the plug hole . When some came drooling out the exhaust port , the little lightbulb whent on . ( Seafoam Deep Creep really does soften carbon ) !
Looks like the exhaust valves were a little tight holding them off the seat transferring the combustion process right into the pipes .
This is the front slug & head .

100051
100052
 

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Nice

Filed away for potential future use....
 
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