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Ethanol and your Amal

Modern pump gas pulls water into your tank and leaves varnish where fuel should flow.

Your Amal Concentric was built for a fuel that hasn't existed since the Carter administration. Straight gasoline, no additives, and it could sit in the float bowl for weeks without becoming a problem. E10 doesn't work that way. It's a different chemical, and your carb is the part that pays for it.

Ethanol pulls water

Ethanol is hygroscopic, meaning it pulls moisture out of the air. In a sealed modern car tank that's minor. In a Triumph tank that vents, breathes, and then sits between rides, it adds up. Once the fuel absorbs enough water it hits saturation and separates. The ethanol and water drop to the bottom of the tank as their own layer, denser than the gas floating on top. That layer is exactly what your petcock feeds into the carb.

Leave E10 in a Triumph tank through a humid California winter and it will separate. It's only a question of when.

What it does inside the carb

Evaporation first. E10 gasses off differently than straight gas, and what it leaves behind is a sticky varnish that sets up inside the jets. A pilot jet with a .3mm orifice doesn't care about your excuses. It clogs.

Then there's the rubber and fiber. Old float needles, some gaskets, and certain bowl seals were never spec'd for alcohol content. Ethanol swells and degrades them over time, and a swollen float needle means fuel where it shouldn't be. That isn't a running problem, that's a fire under your seat.

You get about three good weeks

This is the number that actually matters. Fresh ethanol gas will run your bike well for roughly three weeks. After that the carb starts acting funny. Hesitation off idle, an idle that won't settle, a bike that just feels wrong in a way you can't point at. That's the fuel going off, not your tuning going out.

So stop filling the tank all the way. A full tank on a bike you ride twice a month is a tank of gas that will spoil before you burn it. Put in what you're actually going to use, pay attention to how fast you're going through it, and keep adding fresh gas as you go. New fuel going in on top of old fuel is the cheapest way there is to keep the average age of what's in your tank down.

Stabilizers

We have not found one that fully solves this. Some help, some don't seem to do much of anything, and none of them turn E10 back into 1968 gasoline. What they're mostly doing is slowing oxidation, keeping the fuel from going stale and gummy. That's worth something. It isn't the same as preventing phase separation, and the labels tend to blur that line.

Sta-Bil 360 is formulated with ethanol blends in mind. Star Tron works on a different principle, using enzymes to disperse small amounts of water back into suspension instead of letting it pool at the bottom. Both are worth a shot. Neither one buys you unlimited time, and neither one gets you out of the three week window.

What you don't need is four bottles of additive in your tank. Pick one, use it consistently, and pay attention to whether the bike actually runs better. Layering products doesn't stack up the protection, it just makes it impossible to tell what's doing anything.

Drain the bowls

When you know the bike is going to sit for a while, get the fuel out of the float bowls. That's where varnish does the most damage, because those are the smallest passages and the closest ones to the jets.

Easiest way to do it: on the way home, when you turn onto your street, shut the petcock off and leave the bike running. Let it starve itself out instead of hitting the kill switch. By the time it dies the bowls are empty and you never touched a drain screw.

Running the whole tank dry matters less than people think unless the bike is parked for months. The bowls are the part that counts.

Find better gas

California has more ethanol free pumps than most people expect. Check pure-gas.org before you assume you're stuck with E10. Marinas and small engine shops often carry non ethanol fuel too, since two stroke equipment has the same problem your Triumph does. It costs more per gallon. It's still cheaper than a carb rebuild.

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Valve Adjustments

Valve adjustments are the job everyone skips, and the one that kills top ends.

Every unit Triumph twin loses valve clearance over time. 500 or 650, T100 or Bonneville, doesn't matter. Nothing is broken when it happens. It's how the engine is built. Steel pushrods, aluminum cases, a rocker box bolted to a head that heats and cools every time you ride. All of it moves at a different rate. The clearance you set on a cold Sunday morning is not the clearance you have at 65 twenty minutes later, and it's nothing like the clearance you'll have in six months.

Most owners never check them. The ones who do check once and figure the job is done. Both end up in the same place.

The bike will tell you

Won't idle? Runs rough down low? Feels lazy in a way you can't quite point at? Check the tappets first. We see this constantly. It's far and away the most common reason a bike shows up here running badly, and it's the cheapest thing on the list to fix.

Valves out of adjustment steal power. The bike doesn't die, it just gets worse in ways that are easy to blame on carbs or ignition. People chase jetting for weeks on a bike that needed fifteen minutes and a feeler gauge.

If you're losing compression, look at the valves before you start talking about rings. A tight valve isn't sealing, and a valve that isn't sealing reads on a compression gauge like a worn top end. Do a wet test and you'll know which one you've got.

After a top end, check them again

This one catches people. Fresh top end, new valves, cut seats, reground faces, and all of it still bedding in. The first few hundred miles are when clearances move the most, and they move tight. Finding tight valves after a rebuild doesn't mean somebody did the job wrong. It means the engine is doing what it's supposed to do.

Check a couple hundred miles after the motor goes back together, then again around 500. Skip it and you can burn a brand new exhaust valve on an engine you just paid to rebuild.

Why the gap closes

Valve seats wear. Every time a valve closes it seats a hair deeper into the head. Hundreds of miles of that adds up, and as the seat recedes the valve sits closer to the rocker, which closes the clearance. Tight clearance means the valve never fully seals at the top of its stroke. It can't dump its heat into the seat, so it runs hot, and now you're pulling a head instead of turning an adjuster.

Rocker gear and pushrod wear can open the gap up instead, but seat recession is the main driver and it always tightens. That's the direction to watch.

Cold, always cold

Fully cold. Not \"it's been sitting twenty minutes.\" Aluminum sheds heat faster than the steel valve train, so if you adjust a warm head you'll set clearances that are wrong the second the engine comes up to temp. Every spec published for these engines assumes the bike is at room temperature.

Rotate the engine until the cylinder you're working on is at TDC on the compression stroke. Both valves closed, visible play at the rockers. Working the wrong stroke is the most common mistake we see, and it's an easy one to make, because the crank hits TDC twice per cycle and only one of them is the one you want.

The feeler gauge

The gauge should slide with a slight drag. Not floating, not jammed. Most people set them too tight, because a snug fit feels like it must be correct. If you have to push the gauge through, you're already out of spec. You want to feel it touching both surfaces without forcing it. If it drops through with no resistance at all, snug the adjuster up.

Do your final check with the locknut tight. Torquing that nut will move the setting a few thou if you aren't holding the adjuster still while you do it.

Exhaust side matters more

If you're only going to be careful about one thing, be careful about the exhaust. Exhaust valves run much hotter than intake, and a tight exhaust clearance is what burns a seat or holds a valve off its seat under load. An intake a little off spec is forgiving. An exhaust a little tight is not.

How often

Ridden regularly, meaning real miles and not driveway idling, check every 1,500 to 2,000. That's not a scare number. It's roughly how long seat recession takes to move the gap enough to matter on these engines. A bike that sits most of the year can go longer between checks, but the first ride of the season is when you check them, not when you skip them because it ran fine last October.

Tappets take fifteen minutes and a feeler gauge. A burnt valve takes the head off the bike.

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