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Old 07-20-2014, 08:31 AM   #1
VolForLife OP
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Fuel recommendation ?

Forgive me if this is an old question. I couldn't find an answer using the search function.

What fuel type and octane is recommended for my 1971 Yamaha DT-1?

Back then, we didn't have unleaded. The gasoline near me is typically unleaded, 10% ethanol, and octane choices are 87, 89, and 91. I can find 93, but not as easily.

Thanks!



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Old 07-20-2014, 08:47 AM   #2
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The highest octane available and keep an eye on the plug for signs of detonation. It will be little black/dark brown spots on the insulator. If they show up the timing will need to be retarded a couple degrees. The advance curves were designed when fuel was good. Which the swill we overpay for is not.

I assume you don't want to run race fuel.

Pepper
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Old 07-20-2014, 08:54 AM   #3
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Quote:
Originally Posted by anotherguy View Post
The highest octane available and keep an eye on the plug for signs of detonation. It will be little black/dark brown spots on the insulator. If they show up the timing will need to be retarded a couple degrees. The advance curves were designed when fuel was good. Which the swill we overpay for is not.



I assume you don't want to run race fuel.



Pepper


Thanks Pepper. Makes sense.

Yeah I want to ride the bike locally on the street to trails and back, and I don't want to get caught out needing gas and not be able to find it. So race gas is probably not going to be on the menu for me.

I will look around to see if there's any stations nearby that have higher than 91 and/or no ethanol.



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Old 07-20-2014, 09:01 AM   #4
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91 should work well for you. Ethanol really becomes an issue when sitting/stored. If you're not going to ride for more than a week or so drain the carb. And use Startron. It works and is a good idea for regular use.
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Old 07-20-2014, 09:13 AM   #5
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Thanks again.

I have some samples of Driven Carb Defender I'm planning to try:
http://www.drivenracingoil.com/dro/c...case-of-6html/




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Old 07-20-2014, 05:50 PM   #6
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I run a IZH 2 stroke as a work bike have dome many years now, when ethanol reared its head a few year ago in unleaded fuel here in the uk i looked into it a little further. Found that in the uk most unleaded was mixed about 5% at that time, but the super+ unleaded fuels from BP and tesco did not contain ethanol. So i started using this petrol from then on and have seen no negative results, its just the same as 4 star leaded as far as i can tell.
Not sure how much this will help you in America but if you get super pluss unleaded fuels look at them see how much ethanol is in their blends over there, your 10% is higher than i have ever seen mentioned over here.
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Old 07-20-2014, 09:46 PM   #7
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Pure-gas.org can help you find the good stuff.
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Old 07-21-2014, 07:52 AM   #8
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They don't update nearly enough. I haven't found one listed still selling it in a couple years.
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Old 10-31-2014, 02:59 PM   #9
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PureGas.Org relies on consumers to report the status of the various stations listed. There's an update section at the bottom of the page to report.
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Old 10-31-2014, 09:07 PM   #10
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for what it's worth, i run all my bikes on 91 pump.
i've tuned/jetted them to run as best as possible on 91... not saying a couple of my bikes wouldn't run better on the non-ethanol stuff, it's just not worth my time seeking it out.

i've never had a problem* with ethanol, even on my 60s diaphragm tillotson carbs.

i don't drain if they'll be sitting a week or two, but longer than that and i'll drain the carb(s).

*well, one thing: fuel lines. i've never had a fuel line last more than 6 months once fuel has gone through it. drain it or leave it; same thing.

that's just me. your results may vary. i'm not a scientist, i only play one on tv.
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Old 11-01-2014, 08:32 AM   #11
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I run VP U4 series in both the dirt bikes. Consistency and latitude in jetting. Set it and forget it. Well and the extra ponies people love to argue about too. Might be switching to VPR for $$$ reasons.

Used to run MR2 in the YZ465 but they quit making it for some reason. Unfortunate that was some great stuff.
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Old 11-02-2014, 04:23 AM   #12
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Same here, just using best fuel I can get from the gas station. We call it Super plus. You might look up the web pages of the gas station brands you have in your neighborhood too look up what they put inside their fuel. I found out that our lokal Brand ARAL with their Ultimate fuel provide a fuel that don't have ethanol inside instead using alkyd which is very OK, so no problems with fueling and storage, no dissolving or cracked fuel lines, plastic or fiberglas tanks. And I just ride old stuff being 25 to 35 years old.
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Old 11-02-2014, 10:53 AM   #13
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Quote:
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I run VP U4 series in both the dirt bikes. Consistency and latitude in jetting. Set it and forget it. Well and the extra ponies people love to argue about too. Might be switching to VPR for $$$ reasons.

Used to run MR2 in the YZ465 but they quit making it for some reason. Unfortunate that was some great stuff.

your reasons to run VP U4 i think are pretty damn valid. i trade all of them off for convenience, which does at times bite me in the ass.

when tuning for 91 octane swill, i've gotta be lenient in jetting (leaving lots of leeway), which loses out on potential extra ponies... as well as not running as much ignition timing, again losing out on potential extra ponies.

for a while my daily driver (built to shit '67 sportster) would only run on 104 octane if i wanted to run full advance and have a fun scoot... or retard the shit out of the timing and still ping on 91. then i got it running on E85 for a half way decent compromise (fuel consumption was insane). in the end i lowered the compression from 11:1 to 9:1 and tuned to run on 91. not as fast, but sure is a lot easier.

now it's $ as well as convenience. 4 kids and another due any day... pretty soon i'll be tuning my bikes to run whatever is in the neighbor's gas tank
(where's the siphon smiley???)
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Old 11-02-2014, 11:22 AM   #14
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55 yrs/old,single and a motorcyclist. Nirvana my friend.
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Old 11-02-2014, 12:21 PM   #15
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41 years old, married w/children, motorcyclist and hot rodder... i don't get shit done :)
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