She likes 89 octane. - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 17 (permalink) Old 07-09-2019, 02:02 AM Thread Starter
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She likes 89 octane.

Finally put on enough miles to find what grade my 700 likes best, she likes mid grade (89 octane) runs the best unlike my CB750 that loves premium.


Eventually the light always fails you.
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post #2 of 17 (permalink) Old 07-09-2019, 01:21 PM
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If your engines require a higher octane than the required 87 then you may have an issue. What was your experience with 87?

G.
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post #3 of 17 (permalink) Old 07-09-2019, 03:49 PM
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My GS1000 runs best on a 50/50 mix of 91 premium and av gas. My dad built it and she's high strung to say the least. Anything less than 91 and she's not happy.

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post #4 of 17 (permalink) Old 07-09-2019, 06:58 PM Thread Starter
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It runs fine on 87, but I have removed the stock air box and filter and using a high flow filter plus larger jets and better flowing exhaust, so it's getting a bit more air in the cylinders at WOT.


Eventually the light always fails you.
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post #5 of 17 (permalink) Old 07-10-2019, 01:19 AM
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If you were not experiencing knocking/pinging then you should stick with 87. If you were experiencing knocking/pinging then a higher octane is a temporary "fix". High flow filter, jet and exhaust don't require a higher octane unless you have somehow increased your compression ratio. Even the more recent engines can use a higher compression ration but require a PGM-FI and ECM that handle the lower octane. ie Gold Wing has a 10.5 compression ratio and recommended PON is 86.



G.

Last edited by gdb069; 07-10-2019 at 02:13 AM.
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post #6 of 17 (permalink) Old 07-10-2019, 02:07 AM
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Quote:
Originally Posted by Kris Carr View Post
My GS1000 runs best on a 50/50 mix of 91 premium and av gas...
Depending on the year, many GS1000s were 9.2:1 compression ratio and called for minimum 90 PON


G.

Last edited by gdb069; 07-10-2019 at 02:13 AM.
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post #7 of 17 (permalink) Old 07-11-2019, 10:21 AM
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Well I like the original poster know my bike better than most here. My stock 06' 1100 Spirit ran best on 89 octane for 35,000 mi. Now the the Valk just loves 87 octane as recommended. The Vulcan 90 as recommended.




06' 1100 Spirit (sold 6/23/13)
71' CL 100 "Lil' Sista"
99' Valkyrie "Adele"
05' 1600 Vulcan "Ludabelle"

Ride Bell by "Yoman"

To everything there are exceptions.
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post #8 of 17 (permalink) Old 07-11-2019, 11:24 AM
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My 2000 Spirit VT1100C calls for 86 or higher.
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post #9 of 17 (permalink) Old 07-11-2019, 01:57 PM
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My 02 1100 spirit runs fine on all grades but.... With 91 I got more miles from a tankful.

Sent from my LG-H872 using Tapatalk

Good guys ride black bikes
02 1100 Shadow Spirit "EVE"
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post #10 of 17 (permalink) Old 07-11-2019, 06:08 PM
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Quote:
Originally Posted by Chuck_Michigan View Post
My 2000 Spirit VT1100C calls for 86 or higher.

I have a 99 and I run boat gas, think it's 87 octane no ethanol. Bike runs better on that than higher octane ethanol gas. Bike has a low compression ratio so high octane shouldn't do anything for the engine. Ethanol doesn't have as much power for volume compared to gas and in theory it really shouldn't be noticeable but I can notice the difference. After market exhaust and K+N filter, rejet as well. That shouldn't matter octane is all about compression. More air and more fuel doesn't change the compression.

!999 VT1100C
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