661 Oil Test 32:1 vs 40:1 vs 50:1 ?

[bwalker]

An engine properly tuned and running more oil doesn't run any leaner..
There is a such a thing as oil migration times. As load and rpm climb the time an oil stays within the motor shorten. Load it high enough for long enough with not enough oil and bad crap happens.
Maxima did a decent study on this year's ago using oil marked with radioactive isotopes.

 

[bwalker]

And nothing is wrong with running a touch fat. Two strokes make the most torque under load with slightly fat tuning. The problem is guys equate a touch fat with wet mufflers and black plugs. That's much more than a touch fat.
It's funny that guys will argue which saw in a class is the fastest then tune so rich any advantage goes by by. Another reason Mtronic and Autotune are a great idea. The average wood tick is perplexed by adjusting a carb and properly tuning a two stroke motor.

 

[Moparmyway]

I did the rh side of a .404 converting to square full comp ,then hung it on the nail ,am used to skip or semi skips ,106 dl full comp takes forever . ,converted one to 10 degrees for milling on the usg ,that went pretty quick ,square ,not so much .

It sure does !
Lately I can only time to get to a few teeth at any one time.
The last 104 DL .404 I did took me a few weeks, but that was RS to square filed, gullets cleaned, and rakers evened

The 106 DL is for an 088/880 with a 3002 mount ................. Are you sure you arent doing the 104DL for the 3003 mount ?

 

[Trx250r180]

I

It sure does !
Lately I can only time to get to a few teeth at any one time.
The last 104 DL .404 I did took me a few weeks, but that was RS to square filed, gullets cleaned, and rakers evened

The 106 DL is for an 088/880 with a 3002 mount ................. Are you sure you arent doing the 104DL for the 3003 mount ?

Yes it was 104 dl ,i shortened them to 95 dl for a 32 inch bar ,but sharpened before i shortened ,first couple teeth trial end error till i see angles i like so i cull those out ,after happy with angles , they all get the same grind ,stuff does not sharpen the same as 3/8 i am used too ,cutters are taller ,i has about 10 min in the rh side converting round to square ,am used to 5 min doing both sides lol .

 

[Trx250r180]

Maybe I'm just missing something that can be explained to me... maybe not...
But adding more oil ain't gonna' reduce internal engine temperature enough to matter... and it can even increase it (depending). The oil is there for lubrication, the engine parts need only enough lubrication... anything more than enough is wasted. That piston, rod and crank in your picture look plenty "wet"... there appears to be plenty enough oil.

Running a 2-stroke lean will cause it to get hot... a whole friggin' bunch more hot. If I pulled that engine apart and saw that piston my first thought would be "lean", not oil starvation. I'd be thinking lean from either an improper tune or ethanol blended fuel (if I could see the top of the piston I might favor one cause over the other). Typically, in my experience anyway, adding more oil means opening the high side carb screw a little to make them run right... meaning the extra oil forces you to run the engine richer (more fuel), which is what's gonna' cool internal temperatures, not the oil... meaning ya' likely could have just run the thing a touch "fatter" in the first place and not added the extra oil.

Like I said, maybe I'm missing something... but...
When the gas/oil/air mixture enters the crankcase the gas vaporizes, the oil don't. Now you have tiny droplets of oil in there... like a fog, which collects and builds up on the internal parts. Moving parts, such as the crank, sling off any extra, throwing even more of it on places like the cylinder walls and such. What little oil that does find it's way into the combustion chamber doesn't do much for lubrication, it's either burned or just blown out the exhaust (4 stroke engines don't have any oil introduced into the combustion chamber and they survive). It's the vaporizing gasoline that carries away most of the heat (like your evaporating sweat)... running the engine lean means a lot less heat is carried away.

Extra oil can't compensate for a lean tune... it don't work that way.
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I am not sure why the piston got so hot ,maybe a cold seize ? who knows ,a new piston and cyl was put on ,and i ran it for 2 years before got rid of it ,ran 32 to 1 h1r the whole time ,a stock saw i think has 150-160 comp ,modded 220-230 so there has to be more heat produced to make more power ,now i warm up my saws more before i load them down ,gives me a reason to piss rev them

 

[Flatie]

Like it alot thus far. Running it in my bikes as well.

Thoughts on motul 800 off road vs K2?

 

[Flatie]

I agree but thought I'd put it out there if someone ever considered it.

I know you like 800 2t but have you ever run K2 Ron?

 

[bwalker]

Thoughts on motul 800 off road vs K2?

I prefer K2 thus far, especially in a saw. Should know something concrete on it by the end of the summer when my bike has 45 hours on the current piston. Will tear the saw down at the same time for inspection.

 

[bwalker]

I am not sure why the piston got so hot ,maybe a cold seize ? who knows ,a new piston and cyl was put on ,and i ran it for 2 years before got rid of it ,ran 32 to 1 h1r the whole time ,a stock saw i think has 150-160 comp ,modded 220-230 so there has to be more heat produced to make more power ,now i warm up my saws more before i load them down ,gives me a reason to piss rev them

Cold seize usually is a four corner seizure. Yours seized hard on the exhaust side, which is from a lean condition.

 

[Trx250r180]

Looked for the k2 at the bike shop ,they did not stock it at the 2 in town here ,just 927 and super m ,is the k2 fairly new ? or 2 strokes are just the minority now ? They had the yamalube ,that stuff is cheap ,like 10 bucks a quart .

 

[Trx250r180]

Cold seize usually is a four corner seizure. Yours seized hard on the exhaust side, which is from a lean condition.

I always thought 4 corners also ,who knows what it was ,a new top and it was fine after that ,must have had an air leak somewhere

 

[bwalker]

I always thought 4 corners also ,who knows what it was ,a new top and it was fine after that ,must have had an air leak somewhere

Air leak would do it.

 

[Hedgerow]

I always thought 4 corners also ,who knows what it was ,a new top and it was fine after that ,must have had an air leak somewhere

Yup.. Sumthin weren't right...

 

[bwalker]

Looked for the k2 at the bike shop ,they did not stock it at the 2 in town here ,just 927 and super m ,is the k2 fairly new ? or 2 strokes are just the minority now ? They had the yamalube ,that stuff is cheap ,like 10 bucks a quart .

Its been out for 10 years or so. It was originally developed for Kart racing. As the "K" stands for kart.
Two strokes are definantly in a minority now.

 

[nitehawk55]

It ran too lean..

Geebus !! , if it ran lean it would be dry of oil . How could a mixture be lean with that much oil coating everything .

 

[Ray Bell]

Its been out for 10 years or so. It was originally developed for Kart racing. As the "K" stands for kart.
Two strokes are definantly in a minority now.

Maybe especially in Port Angeles. Kind of the end of the U.S.

 

[bwalker]

Geebus !! , if it ran lean it would be dry of oil . How could a mixture be lean with that much oil coating everything .

You haven't torn down many seized motors I take it.

 

[bwalker]

Maybe especially in Port Angeles. Kind of the end of the U.S.

Its not available near me either. I buy it online.

 

[Trx250r180]

Geebus !! , if it ran lean it would be dry of oil . How could a mixture be lean with that much oil coating everything .

That engine was still running,the wet oil is newer then the damage,I saw that after pulling the muffler cover off and tore it down,amazingly it still ran with that score

 

[Whitespider]

Geebus !! , if it ran lean it would be dry of oil . How could a mixture be lean with that much oil coating everything.

"Lean" (or "rich") applies to the air/fuel ratio, not the gasoline/oil ratio.
"Lean" means too much air for the amount of fuel (or not enough fuel for the amount of air).
In other words... you could be drowning the engine with oil, but it could still be running "lean".
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