Gas getting into Crankcase


Information and questions on GL1500 Goldwings (1988-2000)
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jimpdad
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Motorcycle: 1985 Honda Goldwing GL1200A Aspencade
1990 GL1500 Trike
2006 Suzuki 1500

Gas getting into Crankcase

Postby jimpdad » Thu Sep 12, 2013 8:30 pm



I recently picked up a 1990 GL1500 Trike. In taking it for a test run, it ran fine in the local area (25mph+), but when I got it on the open highway it held back and only went 45 mph, figured it was due to not being run for a few months. Seafoam and carb cleaner worked slightly, but noticed the oil level rose up about an inch above normal. Put a compression test on the cylinders and got good reading (170 to 200 lb's dry, 220 to 235 lb's wet). In checking the plugs no. 5 & 6 were like new (just out of the box), when the others were as should be (normal use carbon). I removed the carbs and cleaned them, replaced the coil that was below specs (serving plugs 5 & 6), replaced the timing belts and found one vacuum line leak. put in new oil and filter. Did not synchronize the carbs yet, but when I took the bike on a shake down run, it ran just great (65-70 mph) with plenty of power to go, and idled at 800 rpm's but noticed on a 15 mile run the gas gage went to 3/4 and at 26 miles it was at 1/2. When I checked the oil level it was too high (above the full mark about 1/4 inch.
Would running too rich a mixture on the carbs cause the fuel to enter the crankcase? Or, the number one cylinder being the lowest (170 dry / 220 wet) letting the gas get past the rings. Have charity functions this week, so will be getting back into the bike next week, so if you could, please give me a direction to head.
Thanks, Jim P.



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WingAdmin
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Re: Gas getting into Crankcase

Postby WingAdmin » Fri Sep 13, 2013 3:38 pm

I've heard of bikes sitting idle with gravity-fed gas getting past a leaky petcock and from there down into the cylinders and into the crankcase. However, I can't imagine that happening to a bike that is running - even if one cylinder was too rich to fire (and you'd definitely know if that was the case, as it would be running terribly). Carb floats that are misadjusted causing excess fuel flow will normally just flow gas overboard.

Have you checked the oil to see if it is actually gas in there?

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jimpdad
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Re: Gas getting into Crankcase

Postby jimpdad » Fri Sep 13, 2013 9:28 pm

Thanks for getting back to me. As far as I know, my wing does not have a pet crack. It is fed through the top via a fuel pump. I can not swear that it is gas, but I have not ridden it in the rain and have no other guesses for antifreeze or water would desperate from the oil. Running at 10 mpg is also an issue, my Vet did not run that bad.

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WingAdmin
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Re: Gas getting into Crankcase

Postby WingAdmin » Sat Sep 14, 2013 7:24 pm

jimpdad wrote:Thanks for getting back to me. As far as I know, my wing does not have a pet crack. It is fed through the top via a fuel pump. I can not swear that it is gas, but I have not ridden it in the rain and have no other guesses for antifreeze or water would desperate from the oil. Running at 10 mpg is also an issue, my Vet did not run that bad.


It does have a vacuum-operated petcock, that (is supposed to) shuts off the fuel when the engine stops, which removes vacuum from it.

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jimpdad
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Re: Gas getting into Crankcase

Postby jimpdad » Sun Sep 15, 2013 6:54 pm

Thanks for setting me straight. The Hands manual does not mention it. I checked on YouTube and also found two types of rebuilding kits. Will disassemble it tomorrow and see what type I need. Will keep you posted on progress. With the gas filter falling apart from the gas with ethanol, some debris might have gotten into it.
Jim

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ct1500
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Re: Gas getting into Crankcase

Postby ct1500 » Sun Sep 15, 2013 7:25 pm

This is what I do
Local and need repair help with your 1500, Valkyrie or ST please PM

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jimpdad
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Re: Gas getting into Crankcase

Postby jimpdad » Mon Sep 16, 2013 2:44 pm

Thanks for the info. I had disassembled.the petcock to check condition. Looked to be in good shape, but will be orderind the rebuild kit. Would hate to change the oil to have gas getting back into the engine. Going to sync the carbs first then take it on a shake down run.

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virgilmobile
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Re: Gas getting into Crankcase

Postby virgilmobile » Mon Sep 16, 2013 3:10 pm

Reading your first post again for the seventh time,I have a question or two....
""on a 15 mile run the gas gage went to 3/4 and at 26 miles it was at 1/2.""
I would suggest this....Fill the tank...drive it again...at least 35-50 miles
Is the bike actually going through the gas your gauge indicates???
You should see between 32-38 mpg.

As far as the oil level changing...To some degree,levels will change with temp and if the bike is at the same spot when checked each time.

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jimpdad
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1990 GL1500 Trike
2006 Suzuki 1500

Re: Gas getting into Crankcase

Postby jimpdad » Mon Sep 16, 2013 6:16 pm

I do plan on a good shake down run once I rebuild the petcock and double check plugs, words, compression and sync the carbs. When I originally picked the bike up it ran at 10 mpg and the oil went to an inch above full mark. I am looking for any advice on this issue, gas in the oil is not a good thing.

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virgilmobile
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82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Gas getting into Crankcase

Postby virgilmobile » Tue Sep 17, 2013 7:03 am

Ill start looking into possibilities.

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jimpdad
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1990 GL1500 Trike
2006 Suzuki 1500

Re: Gas getting into Crankcase

Postby jimpdad » Sun Sep 22, 2013 6:27 pm

Status Update;
After cleaning the Petcock, I had taken it out on a 50 and 60 mile run. I had gotten 25 mpg each time. I installed the new parts from the Petcock rebuilding kit, synchronized the carburetors and removed the excess oil from the crankcase. I went on another 50 mile run, but this time only got 20.5 mpg (strong head wind a possibility this time), when pulling a trailer it would only get worse. Waited for the oil to cool down and it was at the same point as when I started (hopefully that is a non issue now that all cylinders are firing.. I ran at 65mph with rpm's at just under 3,000. She idles at 800 rpm's but fluctuates a little.
now to get better mileage and take it on a 100+ mile run before heading down to SC and Fla. for visits.
Thanks for all your help.
Jim P.

cycletraderman
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Re: Gas getting into Crankcase

Postby cycletraderman » Tue Oct 29, 2013 3:02 pm

I recently had this happen to me on a trip, and had to learn this lesson the hard way $1200 repair on the road. Bike got horrible mileage about 28 to 30, and bad smell of gas. Riders behind me complaining about a smell of fuel. Opened fuel door, and found some evidence of a fuel leak from the vacuum petcock. Stopped and checked oil, and level way too high, and smelled of gasoline. Limped into the nearest Honda dealer in Kentucky, and mechanic said that he had just fixed one like this, and that the carbs would have to be rebuilt. Told him about the leaking fuel petcock, and he said not to worry. Picked bike up several days later, and it ran like crap. huge off idle stumble. Mechanic stated that one of the mixture screws was fused in the carb body, and that is just the best it could be fixed. Knowing this was B.S., but being a thousand miles from home, I took the bike, which ran well other than the off idle stumble. Oh by the way the carbs had just been rebuilt a month before, but he insisted on rebuilding them again. I asked him about the fuel petcock, and he said that he had hooked me up for free. This seemed strange, and no charge listed for the repair on my ticket. I did some research on the forum when I got home, and found several that had had this problem because of clogged vents on the gas cap. My tank would woosh whenever I opened the gas lid, and before any of you tell me that is vacuum, its not, because I could put the cap back on and in a few minutes the hot motorcycle would generate more pressure in the tank and it would woosh again. I theorize that the pressurized tank finally overcame the fragile stock diaphram in the petcock, and once it had ruptured, it started leaking on the outside, and getting pulled straight into the intake manifold by the vacuum line that is supposed to actuate it. The simple fix was a new gas cap and a new rebuild kit for the petcock, which by the way has a much thicker diaphram than the stock one. This would have cost me about $100 in parts and probably the same in labor. It would seem to be another dealer fleecing. What do you do on the road though? mechanic replaced both vacuum pistons, needle and seats, kits for both carbs, new accelerator pump supply tube, new floats, and float pins. $600 in parts, full boat retail. Ouch my hiney is still sore!

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jimpdad
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1990 GL1500 Trike
2006 Suzuki 1500

Re: Gas getting into Crankcase

Postby jimpdad » Sun Dec 15, 2013 9:21 pm

Just returned from a round trip to Florida and back to New Jersey, pulling a trailer. I had rebuilt the petcock and had no issues with the gas in the crankcase. Now just need to work on mpg's, I only got between 17 to 20 mpg for the trip. It seems that the clutch is acting up and 4th gear grinding.




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