Use of high octane fuels in small engines

[BuzzardII]

What's the scoop?

 

[Old Busted Hotness]

Kind of pointless. More octane fights pinging/detonation and that's all it does. These things run 7:1 compression, so they should survive on the lowest of low-grade gas. Premium fuel has more detergent additives, and those can be useful.

Oil, however, has a very low octane rating, so adding it to fuel reduces its rating. You shouldn't be using enough oil to reduce it by a meaningful amount, however. Maybe if you're using a high-compression head you could benefit from using premium, but only if it's pinging now.

 

[FNTPuck]

Less power unless your timing or compression requires it. Most of these bikes run best on regular old pump gas.

 

[mark20]

What's the scoop?

I use premium because its ethinal free. So that helps with storage. Other than that, lower octane would run just fine (if its not a super high compression engine)

 

[Wrench]

I've herd to use premium gas 91 in a 2 stroke, cause the oil in the gas reduces the octane rating by 2 to 3 points, so by using premium gas that just brings the octane level back up to normal where it should be at 87.

 

[Member 30571]

The only thing I know is... My motor loves that 40:1 high octane TruFuel.

 

[BuzzardII]

I use regular BUT I give it a real good pep talk !