100 octane
Extreme HDF Member
Joined: Dec 2007
Posts: 13,402
Likes: 941
From: Illinois
If you have cats, it will kill them.
Unless the compression has been raised to at least 12 to 1 there will not be any power improvement.
Leaded gas will foul the plugs, heads, injectors, valves and guides much quicker.
Octane is not power. It is the resistance to ignition and that is all.
The engine tune, compression, timing and cams would need to be spec'd for benefiting from 100 octane gas.
Not to mention that CARB can fine you $10,000 for using in on their highway's you evil polluter. For that reason I suggest that you not post such business on a public forum. Dumb is what dumb does.
Unless the compression has been raised to at least 12 to 1 there will not be any power improvement.
Leaded gas will foul the plugs, heads, injectors, valves and guides much quicker.
Octane is not power. It is the resistance to ignition and that is all.
The engine tune, compression, timing and cams would need to be spec'd for benefiting from 100 octane gas.
Not to mention that CARB can fine you $10,000 for using in on their highway's you evil polluter. For that reason I suggest that you not post such business on a public forum. Dumb is what dumb does.
Last edited by lh4x4; Dec 15, 2014 at 07:25 PM.
Road Warrior
Joined: Apr 2014
Posts: 1,774
Likes: 105
From: Houston, Texas
If so, take it from someone with over 30 years in aviation. Don't run it unless you want to replace some valve seals. I've had more then one bike start to smoke from running 100LL.
Trending Topics
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Here in the UK we went to unleaded fuels later than you chaps did in the USA. Engines built for leaded fuels risked valve and seat damage when using unleaded, but not the other way around - it is a subject I researched at the time.
In those good ole leaded days we had access to fuels here with up to 105 octane and I can confirm that even in a moderately tuned engine they worked darned well! Don't need any engine changes to get a performance boost, although a tuned engine would undoubtedly gain even more.
Over here the taxes paid on fuels for road-going vehicles are much higher than for aircraft fuels, so using any on the road will attract attention and some serious trouble, if caught! So while it is unlikely IMHO that using leaded fuel will have any adverse affects in that regard, there are other good reasons for not using the stuff.
In those good ole leaded days we had access to fuels here with up to 105 octane and I can confirm that even in a moderately tuned engine they worked darned well! Don't need any engine changes to get a performance boost, although a tuned engine would undoubtedly gain even more.
Over here the taxes paid on fuels for road-going vehicles are much higher than for aircraft fuels, so using any on the road will attract attention and some serious trouble, if caught! So while it is unlikely IMHO that using leaded fuel will have any adverse affects in that regard, there are other good reasons for not using the stuff.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Advanced
Joined: Oct 2014
Posts: 69
Likes: 1
From: california
If you have cats, it will kill them.
Unless the compression has been raised to at least 12 to 1 there will not be any power improvement.
Leaded gas will foul the plugs, heads, injectors, valves and guides much quicker.
Octane is not power. It is the resistance to ignition and that is all.
The engine tune, compression, timing and cams would need to be spec'd for benefiting from 100 octane gas.
Not to mention that CARB can fine you $10,000 for using in on their highway's you evil polluter. For that reason I suggest that you not post such business on a public forum. Dumb is what dumb does.
Unless the compression has been raised to at least 12 to 1 there will not be any power improvement.
Leaded gas will foul the plugs, heads, injectors, valves and guides much quicker.
Octane is not power. It is the resistance to ignition and that is all.
The engine tune, compression, timing and cams would need to be spec'd for benefiting from 100 octane gas.
Not to mention that CARB can fine you $10,000 for using in on their highway's you evil polluter. For that reason I suggest that you not post such business on a public forum. Dumb is what dumb does.
Tourer
Joined: Jun 2011
Posts: 486
Likes: 35
From: St. Louis Mo.
Any Leaded fuel is better than any alcohol blend we have today and who is going to know what fuel you have in your tank unless you advertise it. At least you are not burning up our food. You tree hugging, global warming loons need to clean out your litter box.