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16 Posts
Dear Abbey,
There is a black surface coating like paint inside my TW200 2007 right side crankcase that in some places is bubbling and peeling like a paint coating attacked by solvents.
It is only on the aluminum case surface and not on any of the gears or other parts.
Can you shed some light on what this coating is and if softening bubbling has happened to anyone else and what are the ramifications, ... like clogging oil galleys?
My expectation would be to find no coating on the aluminum except whatever gum, varnish, tars are pretty normal inside any engine.
I guess if it comes down to it I will try to be happy about learning how to do a full engine teardown and clean out the loose coating, YUCK!
I'm finding almost nothing about interior crankcase coatings on numerous GOOGLE searches.
signed,
Puzzled in Cape Fear
*********************
Details:
I have just started a kick starter install on a 2007. The bike had gas in the crankcase for maybe two months while I was off on a yacht delivery ( I used to have the bad habit of leaving gas petcock on, not now! ). Thank goodness it wouldn't start when I got back and that was a big mystery so it sat for a couple more weeks. It also had a new little oil drip and it took me a long time to figure out the new little crankcase oil drip smelled of gas.
LIGHTS GO OFF, BELLS RING, BUZZER SOUNDS !!!!! carb dumped the whole fuel tank into the engine
This seemed like a good time do the kick starter install as I have been hanging on to the parts for about a year waiting to get some spare time.
Clean Oil, Fresh Gas, Spark Check and Thumper fired right up and idled for a bit to get oil circulating watching the whole time in the oil sight glass to see that the pump is picking up the oil and watch it drip back into the sump.
Pull off the right crankcase cover and start to pull the clutch and about then I notice the interior of the crankcase is painted or powercoated or something and that there are a number of places where the coating is bubbled and not well adhered . . . .. what a drag .... what about all the other places in the crankcase I can't see that must have loose coating waiting to gum and clog up the works. I am afraid a full teardown may be called for. Hard to imagine Yamaha will cover this but it seems negligent on their part to use a coating that will come off and gum up the works.
There is a black surface coating like paint inside my TW200 2007 right side crankcase that in some places is bubbling and peeling like a paint coating attacked by solvents.
It is only on the aluminum case surface and not on any of the gears or other parts.
Can you shed some light on what this coating is and if softening bubbling has happened to anyone else and what are the ramifications, ... like clogging oil galleys?
My expectation would be to find no coating on the aluminum except whatever gum, varnish, tars are pretty normal inside any engine.
I guess if it comes down to it I will try to be happy about learning how to do a full engine teardown and clean out the loose coating, YUCK!
I'm finding almost nothing about interior crankcase coatings on numerous GOOGLE searches.
signed,
Puzzled in Cape Fear
*********************
Details:
I have just started a kick starter install on a 2007. The bike had gas in the crankcase for maybe two months while I was off on a yacht delivery ( I used to have the bad habit of leaving gas petcock on, not now! ). Thank goodness it wouldn't start when I got back and that was a big mystery so it sat for a couple more weeks. It also had a new little oil drip and it took me a long time to figure out the new little crankcase oil drip smelled of gas.
LIGHTS GO OFF, BELLS RING, BUZZER SOUNDS !!!!! carb dumped the whole fuel tank into the engine
This seemed like a good time do the kick starter install as I have been hanging on to the parts for about a year waiting to get some spare time.
Clean Oil, Fresh Gas, Spark Check and Thumper fired right up and idled for a bit to get oil circulating watching the whole time in the oil sight glass to see that the pump is picking up the oil and watch it drip back into the sump.
Pull off the right crankcase cover and start to pull the clutch and about then I notice the interior of the crankcase is painted or powercoated or something and that there are a number of places where the coating is bubbled and not well adhered . . . .. what a drag .... what about all the other places in the crankcase I can't see that must have loose coating waiting to gum and clog up the works. I am afraid a full teardown may be called for. Hard to imagine Yamaha will cover this but it seems negligent on their part to use a coating that will come off and gum up the works.