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Hello,
Here's the deal. My son's kx60 has lots of oil in the cylinder. I'm assuming that the rings are shot and maybe the piston. I have no idea where to start, what kind of parts I will need and what to look for. The new piston comes in 4 sizes.
I assume all two strokes are pretty much the same so any help is welcome.
Thanks,

David

djh65 wrote:...My son's kx60 has lots of oil in the cylinder.

What do you mean "in the cylinder"? Do you mean in the combustion chamber? Or do you mean it's gathering in the power valve or similiar type place? Is it engine oil?

It was coming out where the exhaust pipe attaches. and when I pulled the plug it was dripping wet.
David

I can't wait for Agent to dig into his bag of tricks and post a complete slide show of exactly what to do.
David

it's a 2 stroke they all do it to some extent .but sounds like you might have the premix a little rich try backing off the mixture a little

Excessive oil could mean a few things. Initially, the burn mix is to rich. This could be caused by low compression via bad ring or faulty reeds, bad gaskets, leaky head, faulty plug, etc...

I would start with:
A compression test.
Check the reeds.
Check for good spark.


Does it have a power valve? Can't remember. If yes, is it functioning properly?

Well I took off the top end. While it looks ok I ordered a new piston. I also have cleaned the carb. New part should be in next week. Any other help still appreciated.

I've had this problem many times on used bikes I bought. Mix Spectro at 12oz per 5 gal of 93 octain pump gas and it should go away. If it doesn't drop the needle one clip. The oil your seeing is unburnt premix oil. After you lean out the mix the bike will clear up and run much better.

Dale

I think it was OFG or Doug talking about digging into a problem before giving it enough thought. I think that is what I have done. Well after top end, clutch, brakes, tires, air filter and gaskets it's pretty much a new bike. lol
David

My sons CR85 slobbers alittle oil also and did since new, I always use the honda 2-stroke oil and after it was broke in started mixing in less, the book said 32:1 I think, but we have been mixing it 40:1 and it seems alittle better. The packing in the silencer got saturated and would drip sometimes so I repacked it and he said the bike actually seemed to run alittle better and it doesnt drip as much. The stock packing seemed thick or dense, the new packing material was lighter. Maybe that helps?

Wouldn't 40:1 have more oil? This thing had a puddle of goo under the pipe. It was coming out of the engine and running onto the ground. I didn't notice if the gas was left on before I noticed the problem. Oh well I guess I just get more practice.
David

djh65 wrote:Wouldn't 40:1 have more oil? This thing had a puddle of goo under the pipe. It was coming out of the engine and running onto the ground. I didn't notice if the gas was left on before I noticed the problem. Oh well I guess I just get more practice.
David

40:1 has less oil per volume than 32:1. The higher the first number, the less oil in the ratio. Just be careful playing with the oil ratio's. For example:

You run 32:1. You switch over to 40:1. You now have more fuel and less oil. Equivalently without touching the jetting, you have more fuel and less air for the same volume of fuel charge. So essentially, by switching oil/fuel ratio's, you can either lean or richen the air/fuel ratio.

In a nutshell, leaning out the oil mixture is not always the solution. You can actually make the scenario worse by doing so because your richening the air/fuel ratio. If your not properly burning the fuel charge, then the oil in the fuel will not burn efficiently either. The point is that I believe you have a jetting issue, not a oil/fuel ratio issue. Your running rich on your jetting.

124 wrote: If your not properly burning the fuel charge, then the oil in the fuel will not burn efficiently either. The point is that I believe you have a jetting issue, not a oil/fuel ratio issue. Your running rich on your jetting.

I believe 124 has probably got the right answer for you ! your jetting is probably way too fat .

How would it change unprovoked.

djh65 wrote:How would it change unprovoked.

How do you know it changed?