Gas in crankcase - Club700XX - Honda TRX700XX Forum
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post #1 of 16 Old 03-06-2013, 03:06 AM Thread Starter
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headscratch Gas in crankcase

A small problem I've had recently. I went for a ride on weekend, had a good 3-hrs drive around local spots, checked the oil afterwards and it was a lot higher than the maximum. It smelled gas as well.

I heard from MX guys that such a problem occurs to injector 4T engines in low temperatures. It was -8 C on that day. So yesterday I changed the oil, put a new Motul 10W40 oil designed specially for quad engines. The old oil looked like watered down. So I am a bit worried if that didn't hurt the engine and how it coud be avoided in the future (I heard radiator should be closed with carton sheets in low temperatures)? I'm wondering if similar effects were experienced anywhere else and if there are any aftermarket solutions to that problem?
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post #2 of 16 Old 03-06-2013, 06:00 AM
 
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I know there was problems on the trx450s of gas getting into the oil, but only due to prolonged wheelies. Other than that, I haven't heard of anything. I've had my XX out many times in the wintern, for 8 hours or more on the lakes pulling people on tubes and whatnot, and I am sure it was -8C or colder through out the whole day.

I've never heard of closing the radiator either. I for one, wouldn't suggest it. They have the radiator there for a reason.

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post #3 of 16 Old 03-06-2013, 06:26 AM Thread Starter
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Yeah, I was trying wheelies on that day too btw, very short though. But I don't think it's the reason in my case, because I heard about oil getting into the crankcase from a few CRF450R guys. And I was told it did due to engines having not heated enough at low temperature. It was explained to me that the breather pipe gets frozen and the ECU orders to enrich the fuel mix, which in the end gets into crankcase somehow (through the piston? 0o). So I'm bit dazzled here too, because I have never heard that from quad guys, let alone XX.

Anyway could I have done some serious damage to engine running on such oil mix (around half liter of gas I believe)? Have not ridden it yet after the oil change.
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post #4 of 16 Old 03-06-2013, 07:41 AM
 
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I've never heard of that before, but it makes sense. I'd probably change the oil twice before running it. Change it once with a cheaper oil, just warm it up a little and let it idle, shut down and change again. Be sure to get all the gas out of it, like you would if perhaps you had got water in it. Like I said, I've never had this happen, but that's what I'd do. If you did to damage, I'd assume it would only be to the top end.

But when I lived in NH, I had my XX out every weekend on the frozen lake, or hitting the power lines and never had a problem with it, and some days it was 0F or below.

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post #5 of 16 Old 03-06-2013, 09:15 AM Thread Starter
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I should have done this probably, now I'll be watching that it doesn't repeat for some reason. I mean I had been riding in much colder conditions as well like -20C and nothing happened.
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post #6 of 16 Old 03-06-2013, 08:46 PM
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Originally Posted by v3rGUN View Post
I should have done this probably, now I'll be watching that it doesn't repeat for some reason. I mean I had been riding in much colder conditions as well like -20C and nothing happened.
did you ride wheelies that day and it didnt do it when it was -20C, if you rode wheelies that day and it was alright then it is probaly the ecu prob you were talking about the 450 R guys having i dont have them problems as were i live it hardly ever gets below 30F!


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post #7 of 16 Old 03-06-2013, 09:15 PM
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as were i live it hardly ever gets below 30F!


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post #8 of 16 Old 03-06-2013, 09:24 PM
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The only two places for gas to get in the oil is either through the cylinder or the crankcase breather in the airbox right?

If you had that much blow by in the cylinder I would have to think you would have noticed it. Did you notice any performance difference? Did you look in your air box and see if your filter had been douched with gas?

When I have frozen crankcase vents closed on other bikes, usually a seal has blown.


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post #9 of 16 Old 03-06-2013, 10:53 PM Thread Starter
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did you ride wheelies that day and it didnt do it when it was -20C, if you rode wheelies that day and it was alright then it is probaly the ecu prob you were talking about the 450 R guys having i dont have them problems as were i live it hardly ever gets below 30F!
No it was the first time I tried wheelies, no more than 2-3 metres though. I still think it is an ecu issue.
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post #10 of 16 Old 03-06-2013, 11:02 PM Thread Starter
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The only two places for gas to get in the oil is either through the cylinder or the crankcase breather in the airbox right?

If you had that much blow by in the cylinder I would have to think you would have noticed it. Did you notice any performance difference? Did you look in your air box and see if your filter had been douched with gas?

When I have frozen crankcase vents closed on other bikes, usually a seal has blown.
Exactly, but no effect on performance was noted whatsoever, at least no negative one. I was hitting big jumps and power lines as I normally do, and everything seemed fine with the output.

Air box was not checked. Good point!
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