TRX250R.ORG
Workshop => Engine and Bottom End => Topic started by: supernutt on August 17, 2013, 01:41:37 PM
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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?
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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
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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
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That sounds like gear oil. Sounds like a leaking seal.
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Definitely not gear oil. Definitely 2 cycle oil. My gear oil is not bright red
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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.
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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.
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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
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had the same thing on my sons when i tore it down a few weeks ago hasnt seemed to hurt anything tho
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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?
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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
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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.
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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
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inch of premix in the cases and it fired right up with no smoke :sign0103: . is your name carlos
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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
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oil should be in the bottom of the crankcase. the turbulence when the crank spins, it shoots oil up onto the cylinder walls and lubricates your piston and rings.
john
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oil should be in the bottom of the crankcase. the turbulence when the crank spins, it shoots oil up onto the cylinder walls and lubricates your piston and rings.
john
I couldnt find the dipstick for the bottom of my cases to check to make sure I had enough oil in it. Oh wait thats on a 4poke. We are talking about 2 strokes right??
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I couldnt find the dipstick for the bottom of my cases to check to make sure I had enough oil in it. Oh wait thats on a 4poke. We are talking about 2 strokes right??
yes you get oil residual left in the crank, however an inch deep is excessive, try only mixing enough premix to use that day,
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I am definitely guilty of mixing more fuel than I need I just want to be able to jump on and go whenever I may want to go for a spin. I should say that there was no excessive smoke when I started it up and it was probably loaded up a little bit when I parked it
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I am definitely guilty of mixing more fuel than I need I just want to be able to jump on and go whenever I may want to go for a spin. I should say that there was no excessive smoke when I started it up and it was probably loaded up a little bit when I parked it
Dominator is a clean burning oil, but that doesn't mean its a 100% combustion oil,
its meant for high heat high compression high rpm engines, but to be honest its not the best mixing of oils, add time in the tank and the molecules even separate more..
keep you premix fresh and run it harder and hotter and you will have less residual oil build up in your crank and more complete protection from properly burned premix
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That makes sense. I run dominator in everything that I have....chainsaws, moped, weedwacker, etc.. and I dont have any problems with anything.....
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i seen your other post about $40 can ship a whole engine. similar to your inch of mix in the cases. you sir are a long ways from reality
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I shipped a LT500 engine in a big cooler to HPR in Arizona for $66. And that thing was 90lbs. But when he shipped it back to me it was $90 plus insurance? Shipped my last 250r engine across the country for $33. Now my fed-ex guy does give me a business discount. It is always cheaper than what is quoted online. Maybe I am spoiled?