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Old 08-08-2018, 02:22 PM   #1
Gixxerguy86
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Leaded Fuel

this is a question more for the old-timers or people who have ran leaded fuel for an extended amount of time. Aside from the potential buildup on exhaust valve stems/guides/seats causing loss of compression, how has your motor held up for you? I've heard more people say that they have been running leaded fuel for years without issues versus others who actually have exhaust valve problems, but these are people who run it in their cars. The ones who did have issues ran heavily leaded fuel. I have personal experience from running 100LL Avgas in my old gixxer and it absolutely loves the fuel on full timing advance, but I've only ran less than one tank-full about every year when I go to a drag strip or something. Now that I have more access to the fuel and I dont take the bike on long trips like I used to, it might be something I may run more frequently. Ethanol-free content is a big plus as the bike is carbureted
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Old 08-08-2018, 02:51 PM   #2
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I'm no old timer, nor have I run a lot of leaded fuel, but I do suspect you'd start to have issues with your catalytic converters, O2 sensors, and AFR sensors in a modern engine. My 1950 Chevrolet seems to like a little lead, but it has none of that modern to worry about.
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Old 08-08-2018, 03:16 PM   #3
Gixxerguy86
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Quote:
Originally Posted by JetBuilt View Post
I'm no old timer, nor have I run a lot of leaded fuel, but I do suspect you'd start to have issues with your catalytic converters, O2 sensors, and AFR sensors in a modern engine. My 1950 Chevrolet seems to like a little lead, but it has none of that modern to worry about.
My bikes don't have any of that, lol
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Old 08-08-2018, 03:57 PM   #4
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My dad let his old bike sit up with gas in it.
Now that I have the bike I'm trying to restore it somewhat. I could have made a couple dozen pencils with all the led in the float bowls.
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Old 08-08-2018, 04:18 PM   #5
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I don't think that was lead you found in those carbs.
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Old 08-08-2018, 08:01 PM   #6
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All leaded fuel will do for your bike is extra octane which will only give more power if you increase timing and/or dynamic compression. Ethanol-free fuel has more heating capacity (aka can make more power) per volume so if you tune for it (be it jetting, computer etc) it will make more power. Valve problems as you described are typically caused by poor exhaust temperature management due to improper tune for the fuel used.

Tetraethyl lead is also helpful for old school inductive hardened cast iron exhaust valve seats to prevent microwelding between the seat and valve. Seat inserts took care of this on most engines in the mid 70's when TEL was phased out.

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Old 08-09-2018, 03:06 AM   #7
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I have access to 100LL that is roughly $4 per gallon, my bike is air cooled running 11.5:1 CR with essentially stage 1 yoshimura cams and larger valves. I’ve got a dyna 2000 ignition that is fully adjustable, on max timing advance it runs really good on the avgas
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Old 08-09-2018, 06:36 PM   #8
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Quote:
Originally Posted by Gixxerguy86 View Post
I have access to 100LL that is roughly $4 per gallon, my bike is air cooled running 11.5:1 CR with essentially stage 1 yoshimura cams and larger valves. Iíve got a dyna 2000 ignition that is fully adjustable, on max timing advance it runs really good on the avgas
I would run leaded fuel in that with no worries
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