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CAVECLOTH

I'm LEAKING!!! HELP!

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5 hours ago, CAVECLOTH said:

t's not leaking fuel, because it doesn't smell like fuel and fuel would evaporate and this stuff has been there for over 24 hours.

I know it's not leaking oil, because it's not that deep Yammy blue.

Fuel, oil, water.   That's the only choices you're allowed.   

Raw liquid oil in the exhaust is highly unlikely, and even if it was... you wouldn't see it leaking from the lower cowling.

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54 minutes ago, fishinwrench said:

Fuel, oil, water.   That's the only choices you're allowed.   

Raw liquid oil in the exhaust is highly unlikely, and even if it was... you wouldn't see it leaking from the lower cowling.

I've had numerous 2 stroke bikes, 3 and 4 wheelers and I've heard of exhaust oil.  And we roached out a lot of bikes.

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3 hours ago, snagged in outlet 3 said:

I've had numerous 2 stroke bikes, 3 and 4 wheelers and I've heard of exhaust oil.  And we roached out a lot of bikes.

Yamaha's don't meter oil into the the fuel, they inject oil behind the carb venturi and the fuel vapor carries it through the ports and into the cylinders one tiny drop at a time.  All unburned oil drains down lubricating crankshaft bearings along the way, and then is recirculated by vacuum to the top crankshaft bearing where it makes its way down over the crank bearings again....over and over until it is all burned up.   

No unburned oil can make it's way into the exhaust tube unless a spark plug isn't firing....and then it's just the very small amount carried in the unburned fuel.

It's arguably the best 2-stroke oiling system ever designed.   It can't over-oil at any RPM, like EVINRUDE VRO and MERCURY O/I, because it is controlled by intake vacuum BEHIND the carbs.  

 

School's out, Beer thirty !

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3 hours ago, fishinwrench said:

Yamaha's don't meter oil into the the fuel, they inject oil behind the carb venturi and the fuel vapor carries it through the ports and into the cylinders one tiny drop at a time.  All unburned oil drains down lubricating crankshaft bearings along the way, and then is recirculated by vacuum to the top crankshaft bearing where it makes its way down over the crank bearings again....over and over until it is all burned up.   

No unburned oil can make it's way into the exhaust tube unless a spark plug isn't firing....and then it's just the very small amount carried in the unburned fuel.

It's arguably the best 2-stroke oiling system ever designed.   It can't over-oil at any RPM, like EVINRUDE VRO and MERCURY O/I, because it is controlled by intake vacuum BEHIND the carbs.  

 

School's out, Beer thirty !

But 4 strokes are quieter and smoke less........

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