Why do I have to run Premium gas in a HD?
#1
03-02-2015, 09:32 AM
Join Date: Aug 2014
Location: NJ
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Why do I have to run Premium gas in a HD?
I,m curious as to why premium gas is the recommended gas in a HD? I just came from a Yamaha FJR 1300 4 cylinder that called for and ran beautifully on regular gas.
If often wondered why premium id recommended in HDs? Why is that? thanks
If often wondered why premium id recommended in HDs? Why is that? thanks
in all honesty, if you care for any air cooled engine it should have super run in it. Jmho
#5
03-02-2015, 09:48 AM
Seasoned HDF Member
#6
03-02-2015, 09:52 AM
Because of the timing advance. You can have your bike tuned with regular, or mid-grade or premium, and then run that grade.
You will lose a little performance, but it won't hurt anything.
Depending on your particular bike, your riding style, the grade of regular in your area, and your elevation above sea level, you might get away with running mid-grade without a tune.
Premium isn't "better" than regular, it's just formulated to operate with more advanced spark timing without pre-ignition (knock) or detonation (catastrophic engine failure).
And yes, I did sleep in a Holiday Inn last night,
You will lose a little performance, but it won't hurt anything.
Depending on your particular bike, your riding style, the grade of regular in your area, and your elevation above sea level, you might get away with running mid-grade without a tune.
Premium isn't "better" than regular, it's just formulated to operate with more advanced spark timing without pre-ignition (knock) or detonation (catastrophic engine failure).
And yes, I did sleep in a Holiday Inn last night,
Last edited by r0de_runr; 03-02-2015 at 09:53 AM. Reason: spelin'
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#9
03-02-2015, 09:59 AM
because of the timing advance. You can have your bike tuned with regular, or mid-grade or premium, and then run that grade.
You will lose a little performance, but it won't hurt anything.
Depending on your particular bike, your riding style, the grade of regular in your area, and your elevation above sea level, you might get away with running mid-grade without a tune.
Premium isn't "better" than regular, it's just formulated to operate with more advanced spark timing without pre-ignition (knock) or detonation (catastrophic engine failure).
And yes, i did sleep in a holiday inn last night,
You will lose a little performance, but it won't hurt anything.
Depending on your particular bike, your riding style, the grade of regular in your area, and your elevation above sea level, you might get away with running mid-grade without a tune.
Premium isn't "better" than regular, it's just formulated to operate with more advanced spark timing without pre-ignition (knock) or detonation (catastrophic engine failure).
And yes, i did sleep in a holiday inn last night,
bingo!
#10
03-02-2015, 10:00 AM
Simply expressed the larger bore 2 cylinder engine has a high enough compression ratio where the premium fuels are used more efficiently.
"Octane" is a measure that equates to how much compression a fuel can take without pre-igniting the spark. The higher the octane,, the higher the compression it can take.
Yes the ricer has a high compression ratio but much smaller pistons.
Octane is all about compression, pre-ignition or pinging. Long term Pre-ignition can damage an internal combustion engine, your engine isn't going to blow if you run a tank or two, but it's a good idea to be aware of what can happen.
"Octane" is a measure that equates to how much compression a fuel can take without pre-igniting the spark. The higher the octane,, the higher the compression it can take.
Yes the ricer has a high compression ratio but much smaller pistons.
Octane is all about compression, pre-ignition or pinging. Long term Pre-ignition can damage an internal combustion engine, your engine isn't going to blow if you run a tank or two, but it's a good idea to be aware of what can happen.
Last edited by JohnMn; 03-02-2015 at 10:04 AM.