What did you do to your bike today?

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ossagp

Sometimes when you see that parttern on the piston it is due to the transmission starting to bleed some oil into the crankcase, but only if it is a lubricant with a pretty high ratio of detergents. ATF and most multiweights have that righer ratio. One that starts running rich will do it to, especially if the owner makes a swtich to a different oil thinking he is going to make his bike run better. Something with more solvent in it, will clean off some established carbon.
 
Mihylo33

Mihylo33

ossagp:
Sometimes when you see that parttern on the piston it is due to the transmission starting to bleed some oil into the crankcase, but only if it is a lubricant with a pretty high ratio of detergents. ATF and most multiweights have that righer ratio. One that starts running rich will do it to, especially if the owner makes a swtich to a different oil thinking he is going to make his bike run better. Something with more solvent in it, will clean off some established carbon.
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That's a new one but I see where it's a possibility with things like ATF. :thumb:
You mean jetted rich not oil rich, correct? I thought when you saw a pattern like the one shown was do to overly rich conditions and lugging the motor and the raw fuel just washing the dome?
 
O

ossagp

Mihylo33:
That's a new one but I see where it's a possibility with things like ATF. :thumb:
You mean jetted rich not oil rich, correct? I thought when you saw a pattern like the one shown was do to overly rich conditions and lugging the motor and the raw fuel just washing the dome?
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Your last sentence is in line with what I am thinking.

Higher detergent motoroils WILL clean off a piston really well too. Pull down some worn automotive engines that run run some of the better grades and see what I mean. You can find a really clean piston right next to one that is pretty carboned up in lots of cases. (The dirty one is the one that was "working")

Jetted: Probably not as you say "jetted rich" but having a "genuine, original, straight from the factory" float setting is probably more likely.
 
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PALMER84ONE

PALMER84ONE

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Something is wrong here?
 
O

ossagp

Great time to load up another roller, half a dozen riders and head for a place to "downhill". You have a round robin match race series. We tried it with more than two and it just didn't hold interest as long.
 
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