SuzukiSavage.com - Gas in Crankcase?

grim Junior Member Offline Posts: 92 San Jose,CA Gender:	Gas in Crankcase? 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
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barry68v10 Serious Thumper Offline Posts: 955 Maryland Gender:	Re: Gas in Crankcase? Reply #1 - 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...
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vroom1776 Serious Thumper Offline Posts: 2110 Gender:	Re: Gas in Crankcase? Reply #2 - 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
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slavy Serious Thumper Offline smart cars for stupid people Posts: 710 Phoenix, Arizona Gender:	Re: Gas in Crankcase? Reply #3 - 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.
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georgekathe

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Re: Gas in Crankcase?
Reply #4 - 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.

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Savage_Greg Serious Thumper Alliance Member Offline Don't go around your ass to reach your elbow... Posts: 7844 SW Washington State Gender:	Re: Gas in Crankcase? Reply #5 - 05/17/07 at 08:08:49 grim wrote on 12/31/69 at 16:00:05: 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?
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courtem

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Re: Gas in Crankcase?
Reply #6 - 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.

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court

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grim Junior Member Offline Posts: 92 San Jose,CA Gender:	Re: Gas in Crankcase? Reply #7 - 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
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Savage_Greg

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Re: Gas in Crankcase?
Reply #8 - 05/18/07 at 21:51:27

courtem wrote on 12/31/69 at 16:00:05:

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.

Geez

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Savage_Greg

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Re: Gas in Crankcase?
Reply #9 - 05/18/07 at 21:54:54

grim wrote on 12/31/69 at 16:00:05:

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.

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steely

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Re: Gas in Crankcase?
Reply #10 - 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.

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Savage_Greg Serious Thumper Alliance Member Offline Don't go around your ass to reach your elbow... Posts: 7844 SW Washington State Gender:	Re: Gas in Crankcase? Reply #11 - 05/19/07 at 04:51:53 steely wrote on 12/31/69 at 16:00:05: 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.
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steely Senior Member Offline Posts: 325 Tulsa, Oklahoma Gender:	Re: Gas in Crankcase? Reply #12 - 05/19/07 at 07:27:00 Yeah, I always forget to mention that!
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