Author Topic: 2 stroke oil in bottom of cases? (Read 7898 times)

supernutt · « **on:** August 17, 2013, 01:41:37 PM »

Pulled off my 310 top end to replace it with a 330 top end. Turning the crank over there is about an inch of 2 stroke oil in the bottom of the crankcase. Is this normal? The crank webs were wet from it. I run amsoil dominator at 40:1 with sunoco 110. had 210 psi compression so that should be enough to burn everything. Any opinions would be appreciated. Should I go to 50:1?

Pumashine · « **Reply #1 on:** August 17, 2013, 01:55:00 PM »

Inch deep or inch long? Does your petcock seal? If its an inch deep then sounds like your gas is leaking into the motor. It is normal to see stroke oil on the bottom of the tins

supernutt · « **Reply #2 on:** August 17, 2013, 02:04:38 PM »

It is definitely an inch deep it did not seem thin enough to be gas/oil mix but it was bright red like my Amsoil

Snowmaker10 · « **Reply #3 on:** August 17, 2013, 02:10:58 PM »

That sounds like gear oil. Sounds like a leaking seal.

supernutt · « **Reply #4 on:** August 17, 2013, 02:33:37 PM »

Definitely not gear oil. Definitely 2 cycle oil. My gear oil is not bright red

Pumashine · « **Reply #5 on:** August 17, 2013, 02:34:24 PM »

How long had it been setting? Usually most of that would burn after a couple minutes of operation. The oil/gas leaking by a petcock leaves oil behind as the gas evaporates.

supernutt · « **Reply #6 on:** August 17, 2013, 02:46:19 PM »

about 4 days. I have been fighting the problem of it loading up at partial throttle in higher gears and lower rpms. Maybe I rode it really slow last time into the yard and that is what happens? I just dont remember there being that much oil in the crank area. Fuel is definately not leaking when turned off. And it fires up second or third kick every time.

supernutt · « **Reply #7 on:** August 17, 2013, 02:51:53 PM »

I put the 330 top end on it and fired it up. No excessive smoke at all......started as good as expected for a just assembled top end

jfwyatt1 · « **Reply #8 on:** August 17, 2013, 03:27:15 PM »

had the same thing on my sons when i tore it down a few weeks ago hasnt seemed to hurt anything tho

Pumashine · « **Reply #9 on:** August 17, 2013, 03:30:45 PM »

I don't believe your supposed to have an inch deep of 2 stoke oil in the cases. Seems like it would burn while you were riding. I run 30:1. Is your jetting rich?

supernutt · « **Reply #10 on:** August 17, 2013, 03:36:09 PM »

I know the last time I ran it I was quite a bit rich by the end of the day it started out at 50° and we ended up about 75 I had it set about right in the morning and by the afternoon it was way too rich. I was 60 miles away from the truck and did not feel like messing with it so I guess that is a possibility

Pumashine · « **Reply #11 on:** August 17, 2013, 03:51:09 PM »

Quote from: jfwyatt1;8964

had the same thing on my sons when i tore it down a few weeks ago hasnt seemed to hurt anything tho

Don't think it does hurt anything. It is good though if you wash the bike like I do all the time and get water in the bottom end. Won't rust up your rod bearing.

fearlessfred · « **Reply #12 on:** August 17, 2013, 05:43:47 PM »

the two stoke oil leaves the mix when vaporized entering the crankcase everthing is slash oiled by the crank .the oil is wicked up to the exhaust port and exits from there If that oil is not in the bottom you should be worried

udontknowme · « **Reply #13 on:** August 18, 2013, 02:16:07 AM »

inch of premix in the cases and it fired right up with no smoke :sign0103: . is your name carlos

2strokesforever · « **Reply #14 on:** August 18, 2013, 05:33:03 AM »

after a while premix oil will get real thick like that...if you have ever left gas in a carb for a long time without starting it oil will just pour out of carb when you open it up