Symptoms changed with synthetic oil

[mixongw]

The bike has 17K on the ODO. I switched fro using Castrol GTX 10W40 to Castrol GPS 20W50 full synthetic. At first, it seemed that shifting gears was a little smoother with a few other minor good things coming from the switch. Lately, I noticed that if the bike is on the side stand and the throttle is blipped a few times, say up to about 7K, there is always a puff of blue smoke upon the release of the throttle. Is this normal? Are these motors known to smoke any at all? I just don't remember seeing it when I used the dyno oil
.

[chef1366]

You did switch to a thinner oil so maybe it's sneaking past the valve seals or rings. Try going back to 10/40. I use 20/50 and my bike doesn't smoke so there might be a problem.

[Dink]

Blue smoke is fuel!!! maybe you shouldn't "blip" it to 7k rpm!!! the rise and fall in revs is causing a richening of the mixture, due to the lack of load on the motor, when this excess burns you get blue smoke.
Dont do that.

Dink

[83'GK]

He switched from Castrol 10w-40 to 20w-50...I think he switched to a Thicker oil, not thinner.

Also though Blue smoke was oil, and Black smoke was fuel.....

And the smoke was probably always there, you just never paid attention to it.

[Dink]

Tom white smoke is oil any other colour is fuel.
You are correct he went to thicker oil, I chose to ignore the correction (some people get upset)

Dink

[mixongw]

Tom white smoke is oil any other colour is fuel.
You are correct he went to thicker oil, I chose to ignore the correction (some people get upset)

Dink

Dink,

I remember when I was a kid having an old '52 Chevy that desperately needed a ring job. On deceleration, it would smoke like crazy. During deceleration, the increased vacuum would suck the oil past the rings and get burned producing a nice blue smoke. This same car had a manual choke that when left closed too long would produce a thick puff of black smoke.

What correction are you referring to that you chose to ignore?

[mixongw]

He switched from Castrol 10w-40 to 20w-50...I think he switched to a Thicker oil, not thinner.

Also though Blue smoke was oil, and Black smoke was fuel.....

And the smoke was probably always there, you just never paid attention to it.

You may be totally correct in your last sentence.

[Dink]

You did switch to a thinner oil so maybe it's sneaking past the valve seals or rings. Try going back to 10/40. I use 20/50 and my bike doesn't smoke so there might be a problem.

Dink,

I remember when I was a kid having an old '52 Chevy that desperately needed a ring job. On deceleration, it would smoke like crazy. During deceleration, the increased vacuum would suck the oil past the rings and get burned producing a nice blue smoke. This same car had a manual choke that when left closed too long would produce a thick puff of black smoke.

What correction are you referring to that you chose to ignore?

That correction.

Dink

[Tarbash 27]

any noticeable new leaks since switching to synthetic?

[mixongw]

any noticeable new leaks since switching to synthetic?

No other new leaks. No leaks at all actually.

[mixongw]

That correction.

Dink

Sorry, I don't speak Australian. But you do have a good sense of humour (I hope!).

[steve-lloyd]

Sorry, Dink, but you are totally wrong about the smoke colour and what it means.
Blue smoke is oil, no question! Black smoke is fuel, no question!
White smoke is rare - assuming it isn't just moisture in the exhaust turning to steam, otherwise only normally seen when a water-cooled engine has just blown up, and is a mixture of steam and oil. :?

[spyderrocs]

blue=oil
black=rich mix
grey=lean
white=water, either in a liquid cooled engine or water in the exhaust being burned.

[Tarbash 27]

my opinion on white smoke is an extreme lean condiditon. i was working on a leaf blower the other day, it would run for about 5 seconds at full throttle than clouds of white smoke would come out and it would cut out than die. i realized it was not getting enough fuel. i than took apart the carburetor cleaned it out. bunch of grime inside. reassembled it and it ran fine, absolutely no smoke at all. this was a briggs and stratton v-twin 4 stroke.

blue smoke, think of a 2 stroke engine, it burns oil.

black, yes, rich

[Dink]

I have been riding and working on bikes for twenty five years, the last ten years I have worked with in the motor industry, including in an engine reconditioners. I have also been a member here reading and contributing to these forums' for over seven years.
White smoke is oil smoke!!
Is the bike showing any signs of oil consumption??
Is fuel usuage up??
Believe it or not I do have a sense of humour ( no matter how twisted )

Dink

BTW steam is clear.