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 .
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 ?
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 .