Hello All! Vstar 1300 performance problem - Page 2 - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #11 of 15 (permalink) Old 08-04-2019, 12:04 PM
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Hello All! Vstar 1300 performance problem

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Originally Posted by Gearheadzgarage View Post
Premium gas ...hmmm. Why would just higher octane gas cause a problem? Maybe has a higher % of water due to longer time in station storage tanks? I think I did use premium at last fill up.


Because the higher octanes burn at different rates and vapor pressures and the engine has to be designed around that timing. 92 in an engine designed around 87 will not completely burn in time and there will be flame still when the exhaust valve opens. Adjusting idle helps some, but 92 burns for a longer time and then You can get pre AND post ignition in the same stroke.

Overall less performance due to the burn rate difference.


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post #12 of 15 (permalink) Old 08-04-2019, 07:21 PM
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Originally Posted by Marty8613 View Post
Because the higher octanes burn at different rates and vapor pressures and the engine has to be designed around that timing. 92 in an engine designed around 87 will not completely burn in time and there will be flame still when the exhaust valve opens. Adjusting idle helps some, but 92 burns for a longer time and then You can get pre AND post ignition in the same stroke.

Overall less performance due to the burn rate difference.


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I always filled up my Stryker which has the same engine as OPs VStar with 93 and never had any issues.


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post #13 of 15 (permalink) Old 08-04-2019, 07:30 PM
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Id check ecm codes to see if there are any faulty sensors

http://vstar1300.pbworks.com/w/page/...gnostic%20mode


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post #14 of 15 (permalink) Old 08-05-2019, 07:47 AM
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Originally Posted by nurtaeff View Post
I always filled up my Stryker which has the same engine as OP’s VStar with 93 and never had any issues.
thats interesting - in a stock bike designed to run 87 putting 93 in the tank will make it run lean - as in burn holes thru your pistons lean

what do your plugs look like when you change them?

have your re-tuned the bike to run richer?

the other consideration is hi octane gas has lower energy density than regular

you will get fewer miles per gallon running premium than regular, there is no way around that. If you do not have a hi compression engine that needs premium, you are paying more for the fuel and getting less miles per tank.
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Last edited by KCW; 08-05-2019 at 07:54 AM.
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post #15 of 15 (permalink) Old 08-05-2019, 10:10 AM
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Originally Posted by KCW View Post
thats interesting - in a stock bike designed to run 87 putting 93 in the tank will make it run lean - as in burn holes thru your pistons lean

what do your plugs look like when you change them?

have your re-tuned the bike to run richer?

the other consideration is hi octane gas has lower energy density than regular

you will get fewer miles per gallon running premium than regular, there is no way around that. If you do not have a hi compression engine that needs premium, you are paying more for the fuel and getting less miles per tank.
Thanks KCW. Guys on Stryker forum said that running premium gas helped with performance, but like Les said I've tried all octane grades and didn't feel any difference, just thought that higher octane gas burns at higher temperature and helps to reduce internal buildup. Plugs actually looked a bit lean, but not terribly lean. They were light yellow to white color, but no ash color. I gotta find a picture of the plugs that I used to have. I re-tuned the bike when changed the exhaust and intake using EJK fuel controller and was checking plugs to make sure all was good and it seemed to be.

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