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GL1800s have low compression ratios. Use regular for your area. More important, use high quality fuel for the better detergent packages.

prs
 
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Regular unleaded 91 octane rating for my wing Premium unleaded 95 octane rating for my ZX14R These Ron ratings are in AUSTRALIAN measures US ron ratings are slightly different I beleave (y)
 

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Fortunately, there's a gas station near me that has 87 octane non-ethanol. I fill up there before heading out. If I have to refuel during the day, I try to find a decent name brand station and use their 87 octane. I get good milage IMHO and haven't had any problems that weren't my fault so far.
 

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First couple tanks were premium, till I read it on here. Went to 87 and no difference. Still getting 46mpg’s :)
 

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Octane rating is derived from when the tester engine starts knocking at a certain air/fuel/loading ratio. Higher octane rating is a slower burning, less explosive mixture. Running premium in an engine that does not require it leads to two things: a lighter wallet, and heavier carbon buildup.

Disclaimer: octane testers were one of the items I used to calibrate for CSA (Canadian Standards Assoc.)
 
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NEW wing
Cylinder arrangement Flat six
Bore and stroke 73.0 x 73.0 mm (2.87 x 2.87 in)
Displacement 1,833 cm3 (111 .8 cu-in)
Compression ratio 10.5 : 1
Valve train Silent cam chain driven, OHC
Intake valve at 1 mm (0.04 in) lift opens -15° BTDC
closes 25° ABDC
Exhaust valve at 1 mm (0.04 in) lift opens 25° BBDC
closes -15° ATDC
Lubrication system Forced pressure and wet sump
Oil pump type Trochoid
Cooling system Liquid cooled
Air filtration Viscous paper element
Engine dry weight GL 1800D/DA/BD: 114.3 kg (252.0 lbs)
GL 1800: 111 .9 kg (246.7 lbs)
GL 1800B: AC 108.3 kg (238.8 lbs)
CM 111 .9 kg (246.7 lbs)
Firing order 1-4-5-2-3-6

OLD GL
Engine type - Number of cylinders​
Six cylinder boxer, four-stroke
Engine details​
-
Fuel system​
Injection. Programmed Fuel Injection (PGM-FI)
Engine size - Displacement - Engine capacity​
1832.00 ccm (111.79 cubic inches)
Bore x Stroke​
74.0 x 71.0 mm (2.9 x 2.8 inches)
Compression Ratio​
9.8:1
Number of valves per cylinder​
2
Camshaft Valvetrain Configuration​
SOHC
 

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Low compression ? 10.5 : 1 Low ?
I wouldn't say 10.5:1 is low now days. But with piston oilers spraying on the underside of the piston to help control piston temp and ward off pre ignition 10.5:1 is normal. But not high compression like it was once thought of.
 

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The latest GL1800 engine is a touring engine not a sports engine
Such as the Hayabusa @ 12.5:1 .
It has been designed as moor economical engine with moor torque
Than the last 1800 engine . so 10.5:1 is high for what is designed
For .

This just a few touring bikes to ponder on.

Honda st1300 10.8:1
Harley Touring Road King 1753.4cc c/r 10.0:1
2020 VStrom c/r 11.3:1 +
2020 Kawasaki Vulcan 1700 Voyager c/r 9.5:1
2020 Yamaha FJ1300A c/r 10.8:1
2020 Indian Roadmaster c/r 11:1 +
 

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I wouldn't say 10.5:1 is low now days. But with piston oilers spraying on the underside of the piston to help control piston temp and ward off pre ignition 10.5:1 is normal. But not high compression like it was once thought of.
Thanks for explaining this. I have wondered about it. I used to think that anything over 10 would require premium, like in the old days, but I noticed that over the yers manufacturers of > 10:1 have recommended lower octane.
 

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Honda makes MILLIONS of engines per year.

You'd think they might know what octane to use they might provide a recommendation.

And put it in the OM.

Oh ya. They do.

And for the GL1800's the recommendation is:

Recommended fuel octane number:
Pump Octane Number (PON) 86 or higher
 

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Regular unleaded 91 octane rating for my wing Premium unleaded 95 octane rating for my ZX14R These Ron ratings are in AUSTRALIAN measures US ron ratings are slightly different I beleave (y)
In the U.S. we use Pump Octane Number (PON) which is an average of Research Octane Number (RON) and Motor Octane Number (MON).
So, what we see on our pumps are (R+M)/2. At sea level, Regular is 87 PON and at higher elevations Regular might be 86 or 85 PON, all of which will run fine as 'Regular' in the GoldWing.
 

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Run whatever you want to spend your money on...book says 87 octane but higher won't hurt it...I run 89.

As he said it wont harm at all.
 

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I'm trying something different this year, I want to see if running 89 helps with the MPG drop off I see with Winter grade fuel, probably not but what the heck.
 
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