Motorcycle Repair/fuel


QUESTION: I have a 2004 Heritage. The manual says use premium gas.
93 octane here in New York contains 10% ethanol.
I know a place that sells ethanol free gas, but it's only 91 octane.
Which is better?

ANSWER: A lot of manuals, car, truck and bike say to use premium gas. the reason for the higher octane is to keep the motor from pinging. I would run a few tanks of the 91 octane. If you don't get pinging I would stick with it.
Good luck and happy riding

[an error occurred while processing this directive]---------- FOLLOW-UP ----------

QUESTION: I should have stated my question more clearly.
Which fuel is ultimately the best?
93 octane w/ ethanol?
91 Octane without ethanol?
Or, to ask in reverse..
Which has the most potential to harm my motor?

this is one of those questions that you can ask 100 people and get a 100 different answers! The way motors are designed today, the 10% ethanol will not hurt your motor. Like I said before, the octane is for pinging. Personally, I don't think either fuel has any potential to harm your motor. Like your bike, mine calls for 93 octane and it has never seen it. I like saving a little bit at the pump.

Motorcycle Repair

All Answers

Answers by Expert:

Ask Experts


Mike Wells


PLEASE READ BEFORE ASKING A QUESTION!!! I CAN ONLY ANSWER QUESTIONS ABOUT HARLEYS !!! I DONT KNOW ANYTHING ABOUT OTHER MODELS!!! IF YOU ASK A QUESTION ABOUT A NON HARLEY BIKE IT WILL GET REJECTED!!!I have a Harley only shop with 30 years experience located in Ohio. We specialize in complete and total repair, restoration, hi-performance, and custom bike building. I can work on Flat Heads to Twin Cams. Please, dont ask how much somthing is going to cost to fix. Labor prices differ all over te country as well as shop to shop!


If its broke on a harley we can repair it. We do complete restoration from the frame up, engine and trans rebuilding, remapping and custom bike building

School of hard knocks!

©2017 All rights reserved.

[an error occurred while processing this directive]