YZ450 gas in oil?

I have an 06 YZ450F and today when I changed the oil I noticed that the oil smelled a little like gas. I have an hour meter on the bike and it only has 4 hours on it and I change the oil every hour. The bike runs great. I have never had this on this bike before nor have I had it on my YZ250F. I can't figure out how this is even possible. Has anyone else had anything like this happen to them? I'm hoping it was a coincidence and that it was just my pan that smelled like gas.

Sounds strange - it should not smell of gas. Changing the oil after each hr is not necessary - go 3/4hrs from this point on :thumbsup:

Every hour is crazy! I would be changing 5 times a day. Just change every 5 hours, you're pry just smelling the gas from the float bowl or something...it shouldnt smell like gas. After your break in (done), you can change less often.

Oil is a lot cheaper to me than an engine. I change it once a week, which is one race and a short practice, and that works out to be 1 to 1 and a half hours. I don't get to ride that much do to work and school.

Oil is a lot cheaper to me than an engine. I change it once a week, which is one race and a short practice, and that works out to be 1 to 1 and a half hours. I don't get to ride that much do to work and school.

if oil is at your low cost expense map and the labor to change it is free...change it as often as you want...but 3-5 hrs is good.........trust us grasshopper! It will not damage the most reliable motor out there! :thumbsup:

gas smell is another issue .... make sure this is not the case

I would think that the gas smell is just a coincidence.

Aren't you an expert in D3? I think that I've seen you race before.

Changing your oil every hour may be excessive, but if you think that it's nesscesary, then go for it.

Yeah, I am an expert in district 3. What number are you? I might have seen you before. As for oil, I come from a long line of paranoid mechanics, so I just feel better if I change my oil way too often. I am the first to admit that it is excessive, but it makes me feel better.

If your float is to high or is stuck it will seep into your engine. Gas will sit on the top of the piston and seep through the rings. The tell tale sign is when you check your oil it gets higher on the dip stick. You probably don't notice because you change your oil so often. Check it close and make note of the place on the dipstick then let it set for a couple days check it again. Pretty simple fix adjust your float or get a new needle and seat. Could just have a small piece of trash in it.

Thanks a lot. I'll check it out.

Yeah, I am an expert in district 3. What number are you? I might have seen you before. As for oil, I come from a long line of paranoid mechanics, so I just feel better if I change my oil way too often. I am the first to admit that it is excessive, but it makes me feel better.

I am #400, and I race a yz125 in 125C, and a yz400f in 250C.

Are you going to Thunder this weekend? Or Frozen for their WNYMA race?

If your float is to high or is stuck it will seep into your engine.

And it will spill all over the floor out of the carb overflow tubes.

I'm going to Thunder sunday. How about you?

I'm going to Frozen.

I went to Thunder once last year, I hated it.

I've heard that they've improved the track alot...So I don't know if I'll go back, since it's a long drive from me, for a dust bowl.

If your float is to high or is stuck it will seep into your engine. Gas will sit on the top of the piston and seep through the rings. The tell tale sign is when you check your oil it gets higher on the dip stick. You probably don't notice because you change your oil so often. Check it close and make note of the place on the dipstick then let it set for a couple days check it again. Pretty simple fix adjust your float or get a new needle and seat. Could just have a small piece of trash in it.
Good call on your first post. Odds are our poster leaves his gas turned on for days at a time. Bad practice. :thumbsup:

However, the dipstick would only show a significant rise in oil level if there was a very considerable amount of fuel in the oil, and of course, only after it had been run long enough to scavenge the sump.

I turn off my gas when I'm not riding. That's the thing, I don't see how much gas could get to the lower end. Maybe just a small amount did, but it wa enough to smell.

I turn off my gas when I'm not riding. That's the thing,
Then, does the petcock leak?

You're right, though. It takes only a small amount of fuel to stink up the crankcase. Some oils have a sort of solvent smell of their own in the first place, too.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now