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Message started by grim on 05/15/07 at 10:45:40

Title: Gas in Crankcase?
Post by grim on 05/15/07 at 10:45:40

How do you know if gas has leaked into crankcase?

Besides running out of fuel too early....but by that time, it is too late

Title: Re: Gas in Crankcase?
Post by barry68v10 on 05/15/07 at 10:57:09

You'll see it in the sight glass and/or smell it if you open the oil filler cap. If you miss those two, you'll notice a progressively rougher running bike...

Title: Re: Gas in Crankcase?
Post by vroom1776 on 05/15/07 at 11:41:27

don't run it with gas in the case.

drain the oil change the fitler, add fresh oil. fix the carb. ride

Title: Re: Gas in Crankcase?
Post by slavy on 05/15/07 at 13:11:48

May be the first symptom is that the bike doesn't want to idle, especially when hot.
If you have a doubt about gas in the oil, the easiest thing is to unscrew the oil filler cap and smell the fumes, or to pull the breather hose from the top of the air box when the bike is running and smell the fumes.

Title: Re: Gas in Crankcase?
Post by georgekathe on 05/15/07 at 15:40:14

if you have reason to think there is gas in crankcase I'd advise stop running engine immediately until fixed problem & change oil & filter & hope no damage has yet been caused.

I once bought a Triumph with a completely shot engine because of this (luckily I figured this out beofre cash changed hands & got a great deal.) had $ left to completely rebuild engine & ran great afterwards.

Title: Re: Gas in Crankcase?
Post by Greg_650 on 05/17/07 at 08:08:49

grim wrote:

How do you know if gas has leaked into crankcase?

Besides running out of fuel too early....but by that time, it is too late

Why do you think that gas has leaked into your crankcase?

Title: Re: Gas in Crankcase?
Post by courtem on 05/18/07 at 06:42:03

I had a bike with this problem. You should suspect that the fuel shut off is not shutting down when vacuum is no longer present to keep it open. Gravity feed from the tank forces past the needle valve in the float bowl and ends up on top of the piston. When you crank the engine the fuel blows by the rings (liquid is non-compressable) and drains into the crankcase. The fix is to ensure fuel shut off functions properly at the tank petcock and that the needle valve in the float bowl is not damaged, or perhaps a small piece of debris is keeping the needle from properly seating when the bowl is full. Drain the oil if you detect gas, change the filter and refill.

Title: Re: Gas in Crankcase?
Post by grim on 05/18/07 at 16:29:19

I don't suspect gas is in my case. I just wanted to know since there are people that are complaining about this problem. Was trying to avoid it by learning from others

Title: Re: Gas in Crankcase?
Post by Greg_650 on 05/18/07 at 21:51:27

courtem wrote:

Geez :P

Title: Re: Gas in Crankcase?
Post by Greg_650 on 05/18/07 at 21:54:54

grim wrote:

I don't suspect gas is in my case. I just wanted to know since there are people that are complaining about this problem. Was trying to avoid it by learning from others

So that makes this another one of those informative topics where we all speculate about what we might do if something unexpected happened when we least expected it.

Now, I got it. At least I asked the right question.

Title: Re: Gas in Crankcase?
Post by steely on 05/18/07 at 22:31:50

I have had gas in my crankcase. You can smell it as soon as you put your nose near the filler hole. DO NOT START THE ENGINE IF YOU SMELL GAS IN THE OIL! Problems will happen. My 82 Suzi had a petthingy problem. Fortunately, it was not run enough with gas in the oil to cause any problems (I currently have the whole top end off of the engine so I was able to verify this).

Should you find that you have gas in your oil, I would recommend replacing the petthingy. On the '82 GS, I decided to go back with a stock unit and forget it for the next 25 years.

Title: Re: Gas in Crankcase?
Post by Greg_650 on 05/19/07 at 04:51:53

steely wrote:

Should you find that you have gas in your oil, I would recommend replacing the petthingy. On the '82 GS, I decided to go back with a stock unit and forget it for the next 25 years.

I would recommend changing the oil too.

Title: Re: Gas in Crankcase?
Post by steely on 05/19/07 at 07:27:00

Yeah, I always forget to mention that! :-[