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Discussion Starter #1 (Edited)
GL1500, any year.

Odd thought, the title, so I ask you here.
Other than fuel going into the cylinder via carb-intake-open valve while parked, is there another route fuel can get into the crankcase?
Bike is 99% parked on the side-stand.

Reason for asking is, fuel mileage is around 42 and oil only lasts 1500 to 2000 miles. Tho it is still clean it feels like old oil when shifting.
 

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1500's rarely use much oil, if enough gasoline were getting into the oil to affect shifting you'd see the level INCREASE on the dipstick.

Other than the route you described above thru the intake, all other possible routes are thru the intake, too, such as pinhole in petcock diaphragm, could suck gasoline into intake when running. But that gasoline would get burned...

The 1000's and 1100's with mechanical fuel pump can get gas in the oil if the pump is leaking internally, running fuel down the pump actuator lever into the cyl head. No such route on 1200 or newer bikes though.

So I agree with Redwing52.....
 

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Getting 42 mpg is better than most of us are getting.
 

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GL1500, any year.

Odd thought, the title, so I ask you here.
Other than fuel going into the cylinder via carb-intake-open valve while parked, is there another route fuel can get into the crankcase?
Bike is 99% parked on the side-stand.

Reason for asking is, fuel mileage is around 42 and oil only lasts 1500 to 2000 miles. Tho it is still clean it feels like old oil when shifting.

Only a used oil analysis (UOA) will confirm if the oil is bad and needs replacement.
 

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I owned two 1500s, a '94SE and a '98SE.

both of them averaged 33 mpg for me, both had a Tulsa Tall windshield which is the primary reason for the low mpg..... the 2nd reason is that I have always lived in the western states where it is 100+ miles in a ruler straight line to the next object to be seen.

So, the throttle is up against the peg going there.
 

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Discussion Starter #8
What kind of oil are you using?
In these forums I went from OEM oil to the suggested to Delo 400LE. It was fine until last year that oil smelled like re-manufactured oil. But they since stopped selling it.

Year ago I tried the Mobile1 synthetic, the lifters rattled like Castanets, went back to Delo.

Now I am trying a different mfg synthetic diesel oil blend. It is working quite nicely, (not saying, still testing).

Of the 5? different oils, the same issue happened. Around 1500 to 2000 miles the shifting gets stiff, just like it would when oil gets old & dirty. I shift soft (or easy) so I can feel it going into gear.
I suppose I would never feel it if I stomped the shift like them (high-eye-roll) macho HD dudes. I prefer to take GOOD care of what I have.
 

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Discussion Starter #9
Oil level rising? Not that I can tell.
I check weekly but with this issue, every evening right after that days ride.

Oil is clear so there is no soot getting past the rings.
It has just over 50,000 miles on the OEM clock, as you all say, just getting broke-in.

Brake fluids are not dropping in their respective reservoirs.

As a shade tree mechanic, I have pulled apart many motors so I am fairly versed in the parts, but not this Wing. That is the reason for asking this threads question, simply, I do not know.
 

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Discussion Starter #10 (Edited)
I owned two 1500s, a '94SE and a '98SE.

both of them averaged 33 mpg for me, both had a Tulsa Tall windshield which is the primary reason for the low mpg..... the 2nd reason is that I have always lived in the western states where it is 100+ miles in a ruler straight line to the next object to be seen.

So, the throttle is up against the peg going there.
My Wing is the 2000SE. What is odd, a sticker on one of the covers says to use 91 octane. Reading threads this bike can use the lowest grade 87 without issues, which I have. Last week I tried the 15% ethanol, no issues, but this is summertime.

For giggles (a few times) 100 Octane. This bike seems perkiest around 93 Octane, any higher there is no difference.
Makes me wonder what this SE has for a motor... but I am sure its normal. Nor have I looked up the Vin for info, yet.

So, fuel mpgs. I too switched to the Tulsa Tall. I enjoy the scenery too much to ride fast, if I do not have to. I am steadily getting 42-ish, a few times 46 & 47 but those were windy days. On those windy days I try to ride with and against for comfort. Side winds, I earnestly look for tree lined roads.
_
Here is that sticker. (below)
Also it does say RON not Octane. Just a habit.

Basically speaking, the higher Octa, uh, RON the more power the motor produces. As a side note, I do get a little better fuel mileage.
I am not interested in debating this, IT IS WHAT IT IS.
 

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My Wing is the 2000SE. What is odd, a sticker on one of the covers says to use 91 octane.

It might say "91 octane RON" - octane numbers can be stated as Research Octane Number or Motor Octane Number, depending on who is stating them. Here in the USA we use (RON+MON)/2 to make things even more confusing...
 

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wing-man.......

I suggest you stop "overthinking" things...............:grin3:

You have a GL1500 (1522 cc) engine. Its a little different than say a 100 hp Flat Head V8 Ford engine.........!!!!
 

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Discussion Starter #13
wing-man.......

I suggest you stop "overthinking" things...............:grin3:

You have a GL1500 (1522 cc) engine. Its a little different than say a 100 hp Flat Head V8 Ford engine.........!!!!
It is answers like yours that hinders new members from joining sights like this.

I will not ask for help from here. Sorry for intruding.
 

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It is answers like yours that hinders new members from joining sights like this.

I will not ask for help from here. Sorry for intruding.
"I am not interested in debating this, IT IS WHAT IT IS."

:?
 

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Just to add clarity about Octane. There are two different ways to check octane. Research Octane Number (RON) and Motor Octane Number. (MON) Europe uses RON numbers while the US uses the MON number. There is a variation of 8 to 10 Octane depending on which way the fuel is tested. Bottom line Europe's (RON) of 91 is equal to the US (MON) of 81 to 83 octane.

https://www.economist.com/babbage/2012/09/17/difference-engine-who-needs-premium
 

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Just to add clarity about Octane. There are two different ways to check octane. Research Octane Number (RON) and Motor Octane Number. (MON) Europe uses RON numbers while the US uses the MON number. There is a variation of 8 to 10 Octane depending on which way the fuel is tested. Bottom line Europe's (RON) of 91 is equal to the US (MON) of 81 to 83 octane.

https://www.economist.com/babbage/2012/09/17/difference-engine-who-needs-premium
Because the name “premium” implies a souped-up fuel that packs an extra punch, many motorists actually believe it delivers more oomph or miles per gallon—and may therefore represent good value. The truth, however, is that premium contains no more energy than regular petrol—around 114,000 British Thermal Units per gallon, depending on the season, the region, the local pollution requirements, and the amount of bio-ethanol that has to be added to petrol in America by law to keep the country’s corn-growers in clover

Stole that from the link
 

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he has not returned to our forum since he made that post
Sad... But probably for the best. If he's going to be offended by that simple exchange, it was only a matter of time.
 
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